Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

In the previous study by the present authors, wind loads on the flat plate roof above a stand had been examined with wind tunnel experiments and Large
Eddy Simulation (LES) which is expected to be used as a tool for the wind-resistant design of buildings. However, the computed and experimental results of
the minimum peak pressure near the corner edge of the roof had not coincided with each other, where the wind blew diagonally for the model. In this paper,
the peak pressures evaluated by using LES with high-resolution models are compared with the experimental results as statistics of wind pressures. And the
fluctuating wind pressure fields are examined by using complex proper orthogonal decomposition (POD). Furthermore, the wind pressure distribution on the
flat plate roof is evaluated in detail by using LES and coherent structures in the fluctuating wind pressure fields are discussed by using complex POD analysis.

DOI： 10.3130/aijs.83.23

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

<p>In the previous study, fluctuating characteristics of pressure field on a flat plate roof and three-dimensional velocity vector field over that have investigated individually using Computational Fluid Dynamics (CFD) and complex Proper Orthogonal Decomposition (POD) analysis. However, velocity and pressure fields are considered to be correlated each other. In this study, the coherent structure including fluctuating fields of velocity and pressure is examined. Using complex POD analysis considering the velocity and pressure simultaneously, it is shown that fluctuating pressure and velocity vector fields over the flat plate roof exhibits several coherent structures associated with vortex fluctuation and pressure propagation.</p>

DOI： 10.14887/kazekosymp.25.0_235

CiNii Article

Publishing type：Research paper (scientific journal)  

 Generally the wind loads on large span structures with a dome roof or free-standing canopy roof have been investigated by using wind tunnel experiments. However, in the case where wind pressures on isolated thin structures such as flat plate roofs are measured by using tubes, it is necessary to install the parts for storing tubes in the experimental model.<br> On the other hand, Computational Fluid Dynamics (CFD) is expected to be used as one of the methods except for wind tunnel experiments. CFD has enabled us to simulate without any physical restrictions on the experimental model. For wind-resistant design of buildings, it is required to predict accurately the peak wind loads, and the Large Eddy Simulation (LES) effective in obtaining approximately equivalent evaluation of wind loads on the buildings in urban areas to the results obtained in wind tunnel experiments. However, there are few studies on the evaluation of wind loads for large span structures using LES. In the case where wind loads on large span structures are estimated by using LES, it is required to reproduce appropriately the unique phenomenon such as conical vortices near the corner edge of the roof. In the previous study on LES for the flat plate roof model, although the present authors presented that it is possible to estimate the wind loads equivalent to the experimental results by using LES, the computed and experimental results of the minimum peak pressure near the corner edge of the roof did not coincide with each other, where the wind blew diagonally for the model.<br> The validation of the results of CFD against experimental results has been carried out by comparing statistics of wind pressure coefficients for each sampling point in general. On the other hand, wind pressures on each part of structures fluctuate with some correlation mutually. It is important for CFD to simulate the fluctuating pressure field equivalent to that of the wind tunnel experiment. Because it involves improving credibility of consideration on fluid fields, comparison of fluctuating wind pressure fields is significant and is one of the validations of the CFD results.<br> In this study, first, focusing on the experimental case that strong wind pressure occurs on the roof, examined are the computational conditions for reproducing this pressure by using LES. Validation of LES results is performed in terms of both statistics of wind pressure coefficients at each measuring point and fluctuating wind pressure fields obtained by using complex Proper Orthogonal Decomposition (POD) analysis. As a result, shown are the appropriate computational conditions and boundary conditions, which enable accurate evaluation of the conical vortices and related minimum peak pressure near the corner edge of the flat plate roof. Moreover, also proposed, is the technique which is valid as a method of evaluating the coincidence quantitatively for the correlation of fluctuating pressure fields.<br> Second, based on the computational conditions obtained the most accurate results in the above examination, wind pressure distribution on the flat plate roof is evaluated in detail by using LES for the original structure model excepted the parts for storing tubes. As a result, it is confirmed that the wind pressure which has the peak wind pressure coefficient of -14.0 and the peak wind force coefficient of -15.5 acts near the corner edge of the roof due to the conical vortices. Furthermore, coherent structures in the fluctuating wind pressure fields are examined by using complex POD analysis, and the relationship between the behaviors of the conical vortices and pressure fluctuation is discussed by using the visualization of computational results.

DOI： 10.3130/aijs.83.23

CiNii Article

Authorship：Last author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes investigation on aerodynamic stability of 3-span continuous steel box girder bridge with main span of 185m. This bridge has very small B/d compared to the existing bridges, the possibility of galloping and vortex induced oscillation is predicted. So wind tunnel tests are conducted to investigate the countermeasure.First, wind tunnel test with sectional models are conducted and it is concluded upper and lower horizontal plate and flap are necessary to suppress galloping and vortex induced oscillation. Wind tunnel test with full bridge model is conducted to verify the countermeasure proposed with sectional model test under smooth flow and boundary layer turbulence.

DOI： 10.14887/kazekosymp.24.0_331

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work  

Generally, the design wind loads for the cantilevered roof of stadiums have been determined with the pressure and/or force coefficients for partially enclosed buildings. However there are cases when the slits are installed between the roof and the stands of stadiums. Although the pressure and force coefficients in consideration with the slits are required in these cases, few studies are available on these coefficients.<br>This paper presents the force coefficients corresponding to the size of slits and pitch of a roof above stand. These coefficients are evaluated by wind tunnel tests and Large Eddy Simulation (LES) that has become available technique to evaluate the wind loads for tall buildings. By comparing the numerical analytic results with the experimental results, the availability of LES to evaluate wind loads on large roofs is examined. And also coherent structures on the pressure field obtained by LES is considered by using the complex Proper Orthogonal Decomposition (POD)

DOI： 10.14887/kazekosymp.24.0_235

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes investigation on aerodynamic stability of 3-span continuous steel box girder bridge with main span of 185m. This bridge has very small B/d compared to the existing bridges, the possibility of galloping and vortex induced oscillation is predicted. So wind tunnel tests are conducted to investigate the countermeasure.First, wind tunnel test with sectional models are conducted and it is concluded upper and lower horizontal plate and flap are necessary to suppress galloping and vortex induced oscillation. Wind tunnel test with full bridge model is conducted to verify the countermeasure proposed with sectional model test under smooth flow and boundary layer turbulence.

DOI： 10.14887/kazekosymp.24.0_331

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

Generally, the design wind loads for the cantilevered roof of stadiums have been determined with the pressure and/or force coefficients for partially enclosed buildings. However there are cases when the slits are installed between the roof and the stands of stadiums. Although the pressure and force coefficients in consideration with the slits are required in these cases, few studies are available on these coefficients.<br>This paper presents the force coefficients corresponding to the size of slits and pitch of a roof above stand. These coefficients are evaluated by wind tunnel tests and Large Eddy Simulation (LES) that has become available technique to evaluate the wind loads for tall buildings. By comparing the numerical analytic results with the experimental results, the availability of LES to evaluate wind loads on large roofs is examined. And also coherent structures on the pressure field obtained by LES is considered by using the complex Proper Orthogonal Decomposition (POD)

DOI： 10.14887/kazekosymp.24.0_235

CiNii Article

DOI： 10.5359/jawe.41.257

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CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The wind pressures on the upper and lower surfaces of the modules indicate negative values where photovoltaic modules are installed on the roof of buildings. Therefore the mean wind forces on the modules are relatively weak. On the other hand, the peak wind forces on the modules become severe due to the differences of fluctuating wind pressures on the upper and lower surfaces. This paper presents the design wind force coefficients for photovoltaic modules installed on the gable roof of low-rise buildings, based on the peak wind force coefficients which are measured the wind tunnel experiments.

DOI： 10.3130/aijt.21.67

CiNii Article

Publishing type：Research paper (scientific journal)  

The wind pressures on the upper and lower surfaces of the modules indicate negative values where photovoltaic modules are installed on the roof of buildings. Therefore the mean wind forces on the modules are relatively weak. On the other hand, the peak wind forces on the modules become severe due to the differences of fluctuating wind pressures on the upper and lower surfaces. This paper presents the design wind force coefficients for photovoltaic modules installed on the gable roof of low-rise buildings, based on the peak wind force coefficients which are measured the wind tunnel experiments.

DOI： 10.3130/aijt.21.67

CiNii Article

It is necessary to assume internal pressure coefficient, when deciding the design wind loads for cladding and components based on the wind tunnel test. This paper evaluates the internal pressure coefficients base on the field measurement and wind tunnel test. JMA-Meso Analysis wind velocity is used as the reference wind velocity. And the Analysis wind velocity is comparison with the Doppler Lidar wind velocity. The internal pressure coefficients estimated from the external pressure coefficients measured by the wind tunnel test and the wind force coefficients by the field measurement. The design internal pressure coefficients are appropriate to the net internal pressure. 

DOI： 10.14887/jaweam.2015.0_165

CiNii Article

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Solar power generation has been expanding as one of the non-fossil fuel energy systems in recent years. The weight of photovoltaic arrays is very light therefore wind load is the dominant load for this kind of structure. Generally wind resistant design is performed according to JIS C 8955. However outside the scope of JIS is the tilt angle of 10 degrees which is favorable in terms of efficiency, so a number of studies have been carried out on the wind forces acting on photovoltaic arrays. Most of these studies are based on wind tunnel experiments or computational fluid dynamics. These methods are available to estimate the wind loads comprehensively. However it is important to verify the results with these methods by comparing with the phenomenon in the fields. Therefore this paper shows the characteristics of wind forces acting on a photovoltaic array in field measurements. This data shows that there is good correlation with the results of wind tunnel experiments. The data also shows the wind pressure fields in typical cases.

DOI： 10.14887/kazekosymp.23.0_277

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Solar power plant on roofs is attracting attention in recent years. In fact, there are gradually increasing numbers of such efforts. In such a case, the attention should be drawn to the wind loads for not only the photovoltaic panels mounted on a roof but also the roof itself. The net wind loads acting on the roof fastener may exceed the design wind loads for the roof without PV panels. This paper investigates the peak wind force coefficients of panels mounted on roofs. The minimum wind force coefficients of the PV panels have almost the same value in various panel layouts. Since the wind loads acting on the roof under PV panels are larger than the wind loads which are generally used by designers, it is necessary to consider the severe wind forces for all over the roof as same as the edge area of the roof.

DOI： 10.14887/kazekosymp.23.0_271

CiNii Article

CiNii Article

CiNii Article

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

Solar power generation has been expanding as one of the non-fossil fuel energy systems in recent years. The weight of photovoltaic arrays is very light therefore wind load is the dominant load for this kind of structure. Generally wind resistant design is performed according to JIS C 8955. However outside the scope of JIS is the tilt angle of 10 degrees which is favorable in terms of efficiency, so a number of studies have been carried out on the wind forces acting on photovoltaic arrays. Most of these studies are based on wind tunnel experiments or computational fluid dynamics. These methods are available to estimate the wind loads comprehensively. However it is important to verify the results with these methods by comparing with the phenomenon in the fields. Therefore this paper shows the characteristics of wind forces acting on a photovoltaic array in field measurements. This data shows that there is good correlation with the results of wind tunnel experiments. The data also shows the wind pressure fields in typical cases.

DOI： 10.14887/kazekosymp.23.0_277

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

Solar power plant on roofs is attracting attention in recent years. In fact, there are gradually increasing numbers of such efforts. In such a case, the attention should be drawn to the wind loads for not only the photovoltaic panels mounted on a roof but also the roof itself. The net wind loads acting on the roof fastener may exceed the design wind loads for the roof without PV panels. This paper investigates the peak wind force coefficients of panels mounted on roofs. The minimum wind force coefficients of the PV panels have almost the same value in various panel layouts. Since the wind loads acting on the roof under PV panels are larger than the wind loads which are generally used by designers, it is necessary to consider the severe wind forces for all over the roof as same as the edge area of the roof.

DOI： 10.14887/kazekosymp.23.0_271

CiNii Article

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

地上に設置された太陽光発電パネルとその支持構造に作用する風力を，太陽光パネルの配置方法をパラメータとして風洞実験によって調べ，最北のパネルではIEC 61215で指定された値を超える風力が生じることを示した。一方，パネルの配置方法は，支持構造部の最大および最小風力にはほとんど影響を及ぼさないことから，支持構造の設計風荷重をアレイの配置に関係なく決定できることを示した。
本人担当部分：実験結果に基づく設計風荷重の設定に関する助言を行った。

Publishing type：Research paper (international conference proceedings)  

地上に設置された太陽光発電パネルとその支持構造に作用する風力を，太陽光パネルの配置方法をパラメータとして風洞実験によって調べ，最北のパネルではIEC 61215で指定された値を超える風力が生じることを示した。一方，パネルの配置方法は，支持構造部の最大および最小風力にはほとんど影響を及ぼさないことから，支持構造の設計風荷重をアレイの配置に関係なく決定できることを示した。
本人担当部分：実験結果に基づく設計風荷重の設定に関する助言を行った。

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DOI： 10.11316/jpsgaiyo.68.1.4.0_812_2

CiNii Article

In recent years, the large-scale power generations using photovoltaic arrays (Mega solar) are spreading quickly. Although the ground installation type of the Mega solar was main, since the flatland in which large-scale installation of photovoltaic arrays are possible has decreased gradually, it is thought that the installation to a slope will also progress from now on. Then, the wind tunnel experiment using a photovoltaic array model was conducted for the two-dimensional slope, and wind force coefficient which acts on the panel was investigated. Part 1 reports the results about wind velocity distribution around slopes in experiments.

DOI： 10.14887/jaweam.2013.0.195.0

CiNii Article

Wind force coefficients for the PV arrays in the sloping ground was measured by the wind tunnel experiment. When an array was installed in a slope, a wind loads are increasing. And the load reduction effect of the windward array may be unable to expect. The increasing wind loads will be covered by the wind force coefficients of JIS C 8955 by using both the angle of the array and the inclination angle of the ground.

DOI： 10.14887/jaweam.2013.0.197.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The photovoltaic panels are examined based on JIS C8917 and are classified into a wind resistance class. However, since the net wind loads on the panels are unidentified, the safety levels of the panels are unknown. This paper investigates peak wind force coefficients on the panels of the photovoltaic arrays on the ground. The wind forces on the panels are different from the forces on the structures for photovoltaic array such described in JIS C8955. And the peak wind forces on the panels are constant at the various layouts of the arrays. The effect of the panel area for the wind forces is also discussed.

DOI： 10.14887/kazekosymp.22.0.157.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Claddings of building are subjected to a large number of cyclic loading due to fluctuating pressure during a typhoon. In this case, the claddings have a risk of fatigue damage by cyclic loading. However, almost designers don&rsquo;t confirm safety for cyclic loading. This paper shows the characteristics of fluctuating pressure acting on the building walls during a typhoon, and the result of evaluating fatigue damage of wall claddings.

DOI： 10.14887/kazekosymp.22.0.197.0

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DOI： 10.11316/jpsgaiyo.67.2.4.0_706_4

CiNii Article

DOI： 10.11316/jpsgaiyo.67.1.4.0_782_3

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

Claddings of building are subjected to a large number of cyclic loading due to fluctuating pressure during a typhoon. In this case, the claddings have a risk of fatigue damage by cyclic loading. However, almost designers don’t confirm safety for cyclic loading. This paper shows the characteristics of fluctuating pressure acting on the building walls during a typhoon, and the result of evaluating fatigue damage of wall claddings.

DOI： 10.14887/kazekosymp.22.0.197.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

The photovoltaic panels are examined based on JIS C8917 and are classified into a wind resistance class. However, since the net wind loads on the panels are unidentified, the safety levels of the panels are unknown. This paper investigates peak wind force coefficients on the panels of the photovoltaic arrays on the ground. The wind forces on the panels are different from the forces on the structures for photovoltaic array such described in JIS C8955. And the peak wind forces on the panels are constant at the various layouts of the arrays. The effect of the panel area for the wind forces is also discussed.

DOI： 10.14887/kazekosymp.22.0.157.0

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CiNii Article

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

最大風速が設計風速レベルの台風通過に伴う風速・風向変化を考慮して作成した屋根外装材に作用する風圧の時系列を用いて、台風進路と相対的な位置関係が異なるいくつかの建築物を対象として，外装材の疲労損傷を評価し，建築物の部位によって疲労損傷度が大きく異なることを示した。また，台風通過時における外装材の疲労損傷度には，比較的大きな荷重振幅をともなう変動風圧による寄与が非常に大きいことを明らかにした。
本人担当部分：修正マイナー則を用いた疲労損傷度評価に関する助言を行うと共に，台風経路と疲労損傷度との関係について考察を行った。

Publishing type：Research paper (international conference proceedings)  

最大風速が設計風速レベルの台風通過に伴う風速・風向変化を考慮して作成した屋根外装材に作用する風圧の時系列を用いて、台風進路と相対的な位置関係が異なるいくつかの建築物を対象として，外装材の疲労損傷を評価し，建築物の部位によって疲労損傷度が大きく異なることを示した。また，台風通過時における外装材の疲労損傷度には，比較的大きな荷重振幅をともなう変動風圧による寄与が非常に大きいことを明らかにした。
本人担当部分：修正マイナー則を用いた疲労損傷度評価に関する助言を行うと共に，台風経路と疲労損傷度との関係について考察を行った。

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CiNii Article

DOI： 10.5359/jawe.36.287

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To request the design wind loads for the components and claddings by the wind tunnel experiment, it is important to evaluate the spacing averaged wind pressure. However, it is not examined to slender rectangle tributary are like the folded-plate roof. The tributary area is growing by the same width of finding. Then, the evaluation method of the peak value for such a long and slender material is proposed. The evaluation method of using the model of a simple beam leads the peak wind pressure coefficient based on the response of the material. The usual averaging method undervalues the peak coefficients, it was necessary to divide the peak coefficients.

DOI： 10.14887/jaweam.2011.0.161.0

CiNii Article

A light gauge metal sheet roofing was tested by the pressuring method, which use a time series of fluctuating pressure acting on the cladding of a low building during a model typhoon. The test method can allow the estimation of the realistic fatigue damage of any specimens, because it was the realistic wind loading fluctuations. A few problems remain to obtain the rational and realistic test method for the fatigue assessment of building cladding.

DOI： 10.14887/jaweam.2011.0.159.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

There are a lot of studies of wind force acting on the prisms. Recently, multistory residence with balcony is frequently constructed in urban area. In other word, There are many highrise buildings with discontinuous sections in the area. Then, this paper investigates across-wind responses acting on the prisms with discontinuous sections, and characteristics of across-wind force acting on them. Experiments find the prism with discontinuous section that is most effective in reducing across-wind force of them. And, this paper adopts Complex Proper Orthogonal Decomposition to compare wind pressure field of the prism with the discontinuous section with field of the prism with square of cross section.

DOI： 10.14887/kazekosymp.21.0.369.0

CiNii Article

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The POD analysis is effective to reveal coherent structures from a random phenomenon. However, the phenomenon with an advection cannot be expressed by mono-mode of the POD analysis. The wind pressure fields around structures in flows are accompanied in general by advections. For such a case, complex POD analysis is effective. In this paper, the pressure fields around a square-sectioned prism in flows were investigated by the complex POD analysis. As a result, two principal modes, symmetrical and anti-symmetrical modes, are obtained in the case of both of flows. The anti-symmetrical mode expressed the fluctuating wind pressure fields due to the vortex shedding, and the properties were greatly different according to the incident flow. Moreover, the feature of the symmetrical mode was shown, and the relation to the anti-symmetrical mode was discussed.

DOI： 10.14887/kazekosymp.21.0.287.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes peak wind pressure coefficients on a building-high double-skin. Mean pressure coefficients are different with each other between the outer and the inner skins in the cavity near the opening. Since the internal pressure in the cavity cannot be estimated only from the wind pressure on the inner skin, the net peak force across the outer skin is led from difference to pressures of outside and inside of the outer skin. The force coefficients are almost constant over the inside skin in the cavity. The strong negative peak wind force coefficients on the outside skin appear near the opening.

DOI： 10.14887/kazekosymp.21.0.311.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

A new method of fatigue assessment for building cladding is described in this paper. The method products realistic time series of pressure in terms of variation of the wind velocity and direction through the pass of a model-typhoon and pressure measurements on a low building in a turbulent boundary layer wind tunnel. The realistic fatigue index of any cladding during a design typhoon can be influenced by the position of an interest cladding and the orientation of the building, even though the identified typhoon attacks to the identified building. It is significant to consider the fatigue limit state for cladding instead of the strength designing, because many wind damage to cladding might occur from fatigue degradation.

DOI： 10.14887/kazekosymp.21.0.417.0

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CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

There are a lot of studies of wind force acting on the prisms. Recently, multistory residence with balcony is frequently constructed in urban area. In other word, There are many highrise buildings with discontinuous sections in the area. Then, this paper investigates across-wind responses acting on the prisms with discontinuous sections, and characteristics of across-wind force acting on them. Experiments find the prism with discontinuous section that is most effective in reducing across-wind force of them. And, this paper adopts Complex Proper Orthogonal Decomposition to compare wind pressure field of the prism with the discontinuous section with field of the prism with square of cross section.

DOI： 10.14887/kazekosymp.21.0.369.0

CiNii Article

DOI： 10.5359/jawe.35.12

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

The POD analysis is effective to reveal coherent structures from a random phenomenon. However, the phenomenon with an advection cannot be expressed by mono-mode of the POD analysis. The wind pressure fields around structures in flows are accompanied in general by advections. For such a case, complex POD analysis is effective. In this paper, the pressure fields around a square-sectioned prism in flows were investigated by the complex POD analysis. As a result, two principal modes, symmetrical and anti-symmetrical modes, are obtained in the case of both of flows. The anti-symmetrical mode expressed the fluctuating wind pressure fields due to the vortex shedding, and the properties were greatly different according to the incident flow. Moreover, the feature of the symmetrical mode was shown, and the relation to the anti-symmetrical mode was discussed.

DOI： 10.14887/kazekosymp.21.0.287.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes peak wind pressure coefficients on a building-high double-skin. Mean pressure coefficients are different with each other between the outer and the inner skins in the cavity near the opening. Since the internal pressure in the cavity cannot be estimated only from the wind pressure on the inner skin, the net peak force across the outer skin is led from difference to pressures of outside and inside of the outer skin. The force coefficients are almost constant over the inside skin in the cavity. The strong negative peak wind force coefficients on the outside skin appear near the opening.

DOI： 10.14887/kazekosymp.21.0.311.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

A new method of fatigue assessment for building cladding is described in this paper. The method products realistic time series of pressure in terms of variation of the wind velocity and direction through the pass of a model-typhoon and pressure measurements on a low building in a turbulent boundary layer wind tunnel. The realistic fatigue index of any cladding during a design typhoon can be influenced by the position of an interest cladding and the orientation of the building, even though the identified typhoon attacks to the identified building. It is significant to consider the fatigue limit state for cladding instead of the strength designing, because many wind damage to cladding might occur from fatigue degradation.

DOI： 10.14887/kazekosymp.21.0.417.0

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This report shows the wind force characteristics which acts on balcony handrails of condominium under natural wind condition. As the results, the large wind pressure force acts on the balcony handrails at the corner part, and uniformly distributed of the height direction. The mean wind force coefficient which acts on balcony handrails showed that it was possible to evaluate at the inclination of the straight line which envelops peak wind pressure force to the maximum dynamic pressure. It proposed the evaluation method of peak wind force coefficient of the balcony handrail which considered a phenomenon under the natural-wind for the design.

DOI： 10.3130/aijt.15.673

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This paper examines evaluation of peak wind pressure coefficient using with Monte Carlo method. A time series data which has correlation was translated into non-correlation probability parameters by Eigenvalue analysis depend on autocorrelation function. So, probability parameters were assumed that follows normal distribution and extreme value distribution was obtained by Monte Carlo method.

DOI： 10.14887/jaweam.2009.0.58.0

CiNii Article

Publishing type：Research paper (scientific journal)  

This report shows the wind force characteristics which acts on balcony handrails of condominium under natural wind condition. As the results, the large wind pressure force acts on the balcony handrails at the corner part, and uniformly distributed of the height direction. The mean wind force coefficient which acts on balcony handrails showed that it was possible to evaluate at the inclination of the straight line which envelops peak wind pressure force to the maximum dynamic pressure. It proposed the evaluation method of peak wind force coefficient of the balcony handrail which considered a phenomenon under the natural-wind for the design.

DOI： 10.3130/aijt.15.673

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes some problems for the evaluation method of peak wind pressure coefficients on a flat roof. The pressure distribution on a roof is different from that on a wall, although the same factors of the decay factor and the representative area are usually used to evaluate the appropriate pressure coefficients. This tributary area for evaluation the coefficients of a roof are smaller than that area of wall. Furthermore, the peak value evaluated from the moving average method was often smaller than the value from the spacing average method. Therefore, the averaging time for general part rather than the corner part is decided by using the decay factor k of 4.5. The suitable averaging time for the corner part should be selected significantly lager than the averaging time for general part.

DOI： 10.14887/kazekosymp.20.0.70.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes the detailed investigation of the peak wind force coefficient on the balcony handrail of a building. As the result of the field measurements with a large-sized building model, it is found that the strong wind force acted on the balcony handrail in each corner of the building. The area that wind force becomes strong is almost twice the vertical width, not horizontal, of the balcony from the edge of each corner. In addition, it shows how to convert the peak wind force coefficient into the suitable present coefficient, in case the wind measurements in the field differ from the wind assumed on the present criteria. Moreover, it turned out that the formerly reported method to estimate the peak wind force coefficient of the balcony handrail in each corner of the building by the wind pressure coefficient of the external wall is effective also in the field measurements.

DOI： 10.14887/kazekosymp.20.0.72.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes how to plan the emergency operation against wind disasters such as tornadoes as well as how to improve the response capabilities for local governments. The authors investigated some Local Disaster Management Plans documented by many prefectures and traced the response action of Saga City just after the occurrence of the tornado in 2004. It is recommended that the use of the tornado watch/warning system by the Japan Meteorological Agency should be included in the emergency management plan. Furthermore, key facilities which are necessary for maintaining the response action during severe events should be protected perfectly.

DOI： 10.14887/kazekosymp.20.0.41.0

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CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：International journal  

開かれた土地に設置された一辺2.4mの大型立方体模型を用いた野外実験により，自然風の下での接近流と模型周りの風圧の相関性を調べ，立方体のある面に，ほぼ垂直に風があたる場合，風速の風方向成分の変動は風上壁面の変動風圧とは正の，屋根の風上部分の変動風圧とは負の強い相関があることを明らかにした。また，少なくとも模型辺長の0.9倍風上側の流速場は，模型の影響をおほとんど受けないことを明らかにした。
本人担当部分：野外実験全般（模型・風速計等の設置，測定システムの開発）を担当した。

DOI： 10.1016/j.jweia.2007.06.049

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work  

When cladding on a windward wall of a building is broken by a severe storm, the internal pressures may be rapidly increased. The sudden increase of the internal pressure is mentioned as &ldquo;Aerodynamic Overshoot&rdquo;, which may cause further damage to other cladding and interior components. This paper investigates the estimation of Overshoot-ratio using a non-dimensional parameter that characterizes the Overshoot phenomenon. This parameter is defined by using the wall opening area, the internal volume of the building, the incident wind speed and the pressure-loss coefficient of an opening. A result of field measurements suggests that the Overshoot-ratio has the values of 1.1 to 1.2 for usual size buildings. As a result, design wind loads for components and cladding on a building should be decided by using the peak internal pressure coefficient of 1.0 in order to prevent the expansion of damage caused by a wall breakages.

DOI： 10.3130/aijs.73.867

CiNii Article

Publishing type：Research paper (scientific journal)  

Although there have been a number of studies investigating the flows and pressures on a cube using wind tunnel experiments and numerical simulations, there have only been a few actual field experiments conducted. The results of these previous experiments have helped us to clarify the characteristics of surface pressures or wind flows on or around a cube. However, almost all these studies focus on either pressure or flow field only. In this study, a field experiment was arranged where the pressure and flow measurements were carried out simultaneously with a 2.4 m cube on the ground. The velocity field of the approaching flow was observed with a number of anemometers arrayed around the cube that was located in an open area of reclaimed land. The three-dimensional characteristics of the turbulent flows and the fluctuating surface pressures on the cube were examined. (C) 2007 Published by Elsevier Ltd.

DOI： 10.1016/j.jweia.2007.06.049

Publishing type：Research paper (scientific journal)  

When cladding on a windward wall of a building is broken by a severe storm, the internal pressures may be rapidly increased. The sudden increase of the internal pressure is mentioned as “Aerodynamic Overshoot”, which may cause further damage to other cladding and interior components. This paper investigates the estimation of Overshoot-ratio using a non-dimensional parameter that characterizes the Overshoot phenomenon. This parameter is defined by using the wall opening area, the internal volume of the building, the incident wind speed and the pressure-loss coefficient of an opening. A result of field measurements suggests that the Overshoot-ratio has the values of 1.1 to 1.2 for usual size buildings. As a result, design wind loads for components and cladding on a building should be decided by using the peak internal pressure coefficient of 1.0 in order to prevent the expansion of damage caused by a wall breakages.

DOI： 10.3130/aijs.73.867

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes the detailed investigation of the peak wind force coefficient on the balcony handrail of a building. As the result of the field measurements with a large-sized building model, it is found that the strong wind force acted on the balcony handrail in each corner of the building. The area that wind force becomes strong is almost twice the vertical width, not horizontal, of the balcony from the edge of each corner. In addition, it shows how to convert the peak wind force coefficient into the suitable present coefficient, in case the wind measurements in the field differ from the wind assumed on the present criteria.
Moreover, it turned out that the formerly reported method to estimate the peak wind force coefficient of the balcony handrail in each corner of the building by the wind pressure coefficient of the external wall is effective also in the field measurements.

DOI： 10.14887/kazekosymp.20.0.72.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes how to plan the emergency operation against wind disasters such as tornadoes as well as how to improve the response capabilities for local governments. The authors investigated some Local Disaster Management Plans documented by many prefectures and traced the response action of Saga City just after the occurrence of the tornado in 2004. It is recommended that the use of the tornado watch/warning system by the Japan Meteorological Agency should be included in the emergency management plan. Furthermore, key facilities which are necessary for maintaining the response action during severe events should be protected perfectly.

DOI： 10.14887/kazekosymp.20.0.41.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes some problems for the evaluation method of peak wind pressure coefficients on a flat roof. The pressure distribution on a roof is different from that on a wall, although the same factors of the decay factor and the representative area are usually used to evaluate the appropriate pressure coefficients. This tributary area for evaluation the coefficients of a roof are smaller than that area of wall. Furthermore, the peak value evaluated from the moving average method was often smaller than the value from the spacing average method. Therefore, the averaging time for general part rather than the corner part is decided by using the decay factor k of 4.5. The suitable averaging time for the corner part should be selected significantly lager than the averaging time for general part.

DOI： 10.14887/kazekosymp.20.0.70.0

CiNii Article

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CiNii Article

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

開口部をもつ陸屋根建築物を対象とした風洞実験結果に基づいて，屋根葺き材に作用する風圧力の確率分布の評価方法とともに，評価時間内の超過確率から屋根葺き材の設計風荷重を評価する方法を提案した。評価結果と指針値との比較から，開口部がない場合においても指針値に基づく風荷重を超える可能性があること，また，開口部の影響により屋根葺き材の設計風荷重をさらに大きくする必要があることを明らかにした。
本人担当部分：超過確率と設計風荷重との関係に関する考察を行った。

Publishing type：Research paper (international conference proceedings)  

開口部をもつ陸屋根建築物を対象とした風洞実験結果に基づいて，屋根葺き材に作用する風圧力の確率分布の評価方法とともに，評価時間内の超過確率から屋根葺き材の設計風荷重を評価する方法を提案した。評価結果と指針値との比較から，開口部がない場合においても指針値に基づく風荷重を超える可能性があること，また，開口部の影響により屋根葺き材の設計風荷重をさらに大きくする必要があることを明らかにした。
本人担当部分：超過確率と設計風荷重との関係に関する考察を行った。

CiNii Article

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Strong wind disasters has not yet been fully recognized, but they has very higy instantaneous wind speed and bring the heavily damage. The purpose of this paper is to show the necessity for improving recognition level of strong wind disasters including tornado. We examined the response and rehabilitation for the tornado disaster at SAGA Prefecture in 2004. The study has shown the importance of two features. The first is the necessity of early warning system which can communicate to people in another area with Emergency call immedeately after tornado disasters. The second is the importance of "no damage for the pubic facilities at strong wind disasters".

DOI： 10.14887/jaweam.2007.0.37.0

CiNii Article

DOI： 10.5359/jawe.2007.215

CiNii Article

Comparisons of the internal pressure fluctuation on wind tunnel test and the fluctuation on field mesuarment are shown in this paper. Mean internal pressure coefficients were similar to each other. Maximum value of mean internal pressure coefficient was 0.8. A Cross correlation function between the internal pressure near the wall opening and the external pressure near the wall opening had strong correlation. However, the Helmholz resonance phenomenon was not appear on field mesuarment. It was caused by the fact that the pressure flowed out from a gap.

DOI： 10.14887/jaweam.2007.0.59.0

CiNii Article

The characteristics of the conical vortices on a flat roof with eaves are investigated by a simultaneous pressure measurement in smooth and turbulent boundary layer flows. The length of eaves makes stop the switching of the conical vortices or the fluctuation of the vortices. The axes of the vortices occur nearer the edge.

DOI： 10.11345/japannctam.56.0.35.0

CiNii Article

DOI： 10.5359/jawe.2007.167

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The wind pressure on a building fluctuates complicatedly in both time and space. It is important to understand the characteristics of the wind pressure fluctuation to estimate wind forces on buildings.
The complex POD (Proper Orthogonal Decomposition) analysis is the method of aiming to estimate the principal structure of wind pressure fluctuation. The complex POD analysis is the complex eigenvalue problem of the space covariance in the pressure field. In this paper, the complex POD analysis is applied to the fluctuating wind pressure on a 2-dimensional rectangular cylinder and the result is compared with the results of primary POD analysis. By this comparison, the characteristics of the complex POD analysis are clarified.

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This study investigates the evaluation of wind load on flat roof by probabilistic method. Wind pressure fluctuations obtained by wind-tunnel test are approximated by Weibull distribution. The probability of exceedance is calculated with this approximation. The probability of exceedance of Recommendation for Loads on Buildings (RLB) values isexamined and it shows their probabilities, which are 0.17% theoretically, exceed 10%. This implies a risk of RLB values. Then the roof pressure coefficients when an opening is made on the wall are investigated. The values at 0.17% of probability are estimated as -7.4 at the corner and -2.5 at the center. As far as these raised values are considerd at the designing, the roof would retain the same reliability as before even after unexpected breakage occurred on the wall.

DOI： 10.14887/kazekosymp.19.0.349.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The flow around the two dimension circular cylinder is a classical problem of fluid dynamics, and many results were reported by the wind tunnel experiments. However, there are a number of unclarified points about the flow of a cylinder in natural winds. We set up a circular cylinder that was 630mm in the deameter and 5m in height in innings in the Osaka Bay. This report suggests the wind characterestic of the circular cylinder in natural winds. As a result, we found that the drag coefficient became small decreasing in the Reynolds number,when the Rynolds number was smaller than 3*10<SUP>5</SUP>. And so the drag coefficient was constant though the Reynolds number changed, when the Reynolds number was larger than 3*10<SUP>5</SUP>. In addition, result of analyzing stability of wind direction in natural winds, an effective evaluation method was obtained.

DOI： 10.14887/kazekosymp.19.0.367.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper describes the detailed investigation of the wind load acting on the balcony handrail of buildings. As the results of the wind tunnel test with three kinds of building models, the wind load of the balcony handrail was very small at almost all areas except the corner area of building and the peak wind force coefficients were less than 1.0. And the wind load was rapidly increased in the corner of the building. In this wind tunnel test, the maximum of the peak wind force coefficients of the balcony handrail in the corner area became about 3.0. Moreover, the method was proposed that estimates the peak wind force coefficient of the balcony handrail in the building corner by the wind pressure coefficient of the external wall. And the compatibility of the method was investigated.

DOI： 10.14887/kazekosymp.19.0.383.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

The wind pressure on a building fluctuates complicatedly in both time and space. It is important to understand the characteristics of the wind pressure fluctuation to estimate wind forces on buildings.
The complex POD (Proper Orthogonal Decomposition) analysis is the method of aiming to estimate the principal structure of wind pressure fluctuation. The complex POD analysis is the complex eigenvalue problem of the space covariance in the pressure field. In this paper, the complex POD analysis is applied to the fluctuating wind pressure on a 2-dimensional rectangular cylinder and the result is compared with the results of primary POD analysis. By this comparison, the characteristics of the complex POD analysis are clarified.

Authorship：Lead author   Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The estimation of the coherent structures existing in a random phenomenon is important for the study of fluctuating fields, such as the flow fields or the pressure fields around a structure. For the estimation of the coherent structures, Proper Orthogonal Decomposition (POD) is available, which is able to obtain the coherent structures as the principal components of the fluctuating fields. However the components calculated by the POD analysis are stationary modes in space, therefore it is impossible to express the advection phenomenon as a single principal component. In such a case, the complex POD analysis is available. In this paper, the procedure of the complex POD analysis is described. And also the interpretation of it by the use of the complex envelope is shown. The calculations of some model cases are carried out by the POD analysis and the complex POD analysis. By comparing the results, the effectiveness of the complex POD analysis is shown.

DOI： 10.5359/jwe.31.123

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

In order to clarify characteristics of temporal-spatial flow structures above and wind pressures on the roof of a cubic structure, a wind tunnel experiment was carried out in two types of turbulent boundary layers. The flow was measured by Particle Image Velocimetry (PIV) system and simultaneous multi-pressure measurements on the surface were also performed. The time-averaged separation bubble on the roof had flat shape with a gradual curvature. When the intensity of turbulence of the approaching flow was large, and strong local negative pressure was generated in the windward edge corner, a flat conical vortex was formed, and the spatial structure of the flow was different from the time-averaged flow.

DOI： 10.3130/aijs.71.39_2

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Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This report presents damage to roofs of SPring-8, which is the world's largest third-generation synchrotron radiation facility at Harima Science Garden City in Hyogo Prefecture, caused by Typhoon No.0416 on August 30, 2004 and No.0418 on September 7, 2004. As the results of the field studies, it is considered that the damage to roofs was due to not the wind power by the typhoon but due to strength decrease of bolts which had fixed roof materials.

DOI： 10.5359/jwe.31.75

CiNii Article

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

In order to clarify characteristics of separated shear layers above a roof of a cubic model and wind pressures on the roof, a wind tunnel experiment was carried out. The flow was measured by Particle Image Velocimetry (PIV) system and simultaneous multi-pressure measurements on the roof surface were also performed. In this paper, relations between instantaneous separated shear layers above the roof and instantaneous wind pressure distributions were presented. Characteristics of instantaneous wind pressure distributions at the instantaneous reattachment were also discussed.

DOI： 10.3130/aijs.71.17_1

CiNii Article

DOI： 10.5359/jawe.2006.417

CiNii Article

Publishing type：Research paper (scientific journal)  

In order to clarify characteristics of separated shear layers above a roof of a cubic model and wind pressures on the roof, a wind tunnel experiment was carried out. The flow was measured by Particle Image Velocimetry (PIV) system and simultaneous multi-pressure measurements on the roof surface were also performed. In this paper, relations between instantaneous separated shear layers above the roof and instantaneous wind pressure distributions were presented. Characteristics of instantaneous wind pressure distributions at the instantaneous reattachment were also discussed.

DOI： 10.3130/aijs.71.17_1

CiNii Article

Publishing type：Research paper (scientific journal)  

This report presents damage to roofs of SPring-8, which is the world's largest third-generation synchrotron radiation facility at Harima Science Garden City in Hyogo Prefecture, caused by Typhoon No.0416 on August 30, 2004 and No.0418 on September 7, 2004. As the results of the field studies, it is considered that the damage to roofs was due to not the wind power by the typhoon but due to strength decrease of bolts which had fixed roof materials.

DOI： 10.5359/jwe.31.75

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This study investigates the evaluation of wind load on flat roof by probabilistic method. Wind pressure fluctuations obtained by wind-tunnel test are approximated by Weibull distribution. The probability of exceedance is calculated with this approximation. The probability of exceedance of Recommendation for Loads on Buildings (RLB) values is
examined and it shows their probabilities, which are 0.17% theoretically, exceed 10%. This implies a risk of RLB values. Then the roof pressure coefficients when an opening is made on the wall are investigated. The values at 0.17% of probability are estimated as -7.4 at the corner and -2.5 at the center. As far as these raised values are considerd at the designing, the roof would retain the same reliability as before even after unexpected breakage occurred on the wall.

DOI： 10.14887/kazekosymp.19.0.349.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

The flow around the two dimension circular cylinder is a classical problem of fluid dynamics, and many results were reported by the wind tunnel experiments. However, there are a number of unclarified points about the flow of a cylinder in natural winds. We set up a circular cylinder that was 630mm in the deameter and 5m in height in innings in the Osaka Bay. This report suggests the wind characterestic of the circular cylinder in natural winds. As a result, we found that the drag coefficient became small decreasing in the Reynolds number,when the Rynolds number was smaller than 3*10<SUP>5</SUP>. And so the drag coefficient was constant though the Reynolds number changed, when the Reynolds number was larger than 3*10<SUP>5</SUP>. In addition, result of analyzing stability of wind direction in natural winds, an effective evaluation method was obtained.

DOI： 10.14887/kazekosymp.19.0.367.0

CiNii Article

Publishing type：Research paper (scientific journal)  

In order to clarify characteristics of temporal-spatial flow structures above and wind pressures on the roof of a cubic structure, a wind tunnel experiment was carried out in two types of turbulent boundary layers. The flow was measured by Particle Image Velocimetry (PIV) system and simultaneous multi-pressure measurements on the surface were also performed. The time-averaged separation bubble on the roof had flat shape with a gradual curvature. When the intensity of turbulence of the approaching flow was large, and strong local negative pressure was generated in the windward edge corner, a flat conical vortex was formed, and the spatial structure of the flow was different from the time-averaged flow.

DOI： 10.3130/aijs.71.39_2

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)  

This paper describes the detailed investigation of the wind load acting on the balcony handrail of buildings. As the results of the wind tunnel test with three kinds of building models, the wind load of the balcony handrail was very small at almost all areas except the corner area of building and the peak wind force coefficients were less than 1.0. And the wind load was rapidly increased in the corner of the building. In this wind tunnel test, the maximum of the peak wind force coefficients of the balcony handrail in the corner area became about 3.0.
Moreover, the method was proposed that estimates the peak wind force coefficient of the balcony handrail in the building corner by the wind pressure coefficient of the external wall. And the compatibility of the method was investigated.

DOI： 10.14887/kazekosymp.19.0.383.0

CiNii Article

The estimation of the coherent structures existing in a random phenomenon is important for the study of fluctuating fields, such as the flow fields or the pressure fields around a structure. For the estimation of the coherent structures, Proper Orthogonal Decomposition (POD) is available, which is able to obtain the coherent structures as the principal components of the fluctuating fields. However the components calculated by the POD analysis are stationary modes in space, therefore it is impossible to express the advection phenomenon as a single principal component. In such a case, the complex POD analysis is available. In this paper, the procedure of the complex POD analysis is described. And also the interpretation of it by the use of the complex envelope is shown. The calculations of some model cases are carried out by the POD analysis and the complex POD analysis. By comparing the results, the effectiveness of the complex POD analysis is shown.

DOI： 10.5359/jwe.31.123

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It is important to estimate the vibration characteristic of structures for the wind resistant
design or the seismic design. Especially, the influence of the damping characteristic has on
the vibration is large. In general, the Fourier analysis is used for the evaluation of the
vibration characteristics. However, these methods are due to the statistical method based on
the stationary stochastic process, and attention is required to apply to nonstationary
phenomenon. Then, this paper proposes the technique for evaluating the work of external
force, the increment of vibration energy and the dissipation of the structural energy from the
generalization wind force and the building response by using the wavelet transform that is
effective to handle nonstationary phenomenon. Moreover, this technique was applied to the
field measurement result of using the square pillar elastic model, and the relation between
the work of the wind force and the vibration energy was shown.

DOI： 10.14887/kazekosymp.18.0.000034.0

CiNii Article

The accurate estimation of the unsteady wind force is necessary for the rational design of
high rise buildings. For the accurate estimation of the unsteady wind force, it is necessary to
evaluate the phase differences between the wind force and the response of structures. In such
a case wavelet analysis with the complex wavelet is available. This paper presents the
aerodynamic damping force and added mass on a square section prism with the aspect ratio
of 5 evaluated by use of the wavelet analysis. The results are described for a field
measurement with the large elastic model (1m×1m×5m). It is shown that the aerodynamic
damping in the along wind direction is closely related with the oscillation amplitude and the
structural damping.

DOI： 10.14887/kazekosymp.18.0.000073.0

CiNii Article

Wind direction changes all the time in natural winds. Although many results of field
measurements have pointed out that that wind pressures on claddings have been influenced
by the change of wind direction, there are a number of unclarified points about it. That is
reason why the change of wind direction in natural wind has non-stationary condition. This
report suggests a method of analysis for estimating the unsteady wind direction, using the
local maximum and the local minimum for the time series of wind direction in natural
wind. As a result of analysis, we understood that the fluctuation of wind velocities showed
a rising tendency by the more change of wind direction.

DOI： 10.14887/kazekosymp.18.0.000047.0

CiNii Article

The characteristics of a flow around a cubic model in a turbulent flow are experimentally studied by a wind tunnel test. Wind pressures at the windward edge decrease when velocity increase outside of the separated share layer. Negative pressures decrease at the center part of the roof when a strong circulation was formed above the roof. Wind pressures recovered at the leeward edge when a separated share layer reattaches at the leeward edge.

DOI： 10.14887/jaweam.2005.0.33.0

CiNii Article

DOI： 10.5359/jawe.2005.161

CiNii Article

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

It is important to estimate the vibration characteristic of structures for the wind resistantdesign or the seismic design. Especially, the influence of the damping characteristic has onthe vibration is large. In general, the Fourier analysis is used for the evaluation of thevibration characteristics. However, these methods are due to the statistical method based onthe stationary stochastic process, and attention is required to apply to nonstationaryphenomenon. Then, this paper proposes the technique for evaluating the work of externalforce, the increment of vibration energy and the dissipation of the structural energy from thegeneralization wind force and the building response by using the wavelet transform that iseffective to handle nonstationary phenomenon. Moreover, this technique was applied to thefield measurement result of using the square pillar elastic model, and the relation betweenthe work of the wind force and the vibration energy was shown.

DOI： 10.14887/kazekosymp.18.0.000034.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

The accurate estimation of the unsteady wind force is necessary for the rational design ofhigh rise buildings. For the accurate estimation of the unsteady wind force, it is necessary toevaluate the phase differences between the wind force and the response of structures. In sucha case wavelet analysis with the complex wavelet is available. This paper presents theaerodynamic damping force and added mass on a square section prism with the aspect ratioof 5 evaluated by use of the wavelet analysis. The results are described for a fieldmeasurement with the large elastic model (1m&times;1m&times;5m). It is shown that the aerodynamicdamping in the along wind direction is closely related with the oscillation amplitude and thestructural damping.

DOI： 10.14887/kazekosymp.18.0.000073.0

CiNii Article

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Wind direction changes all the time in natural winds. Although many results of fieldmeasurements have pointed out that that wind pressures on claddings have been influencedby the change of wind direction, there are a number of unclarified points about it. That isreason why the change of wind direction in natural wind has non-stationary condition. Thisreport suggests a method of analysis for estimating the unsteady wind direction, using thelocal maximum and the local minimum for the time series of wind direction in naturalwind. As a result of analysis, we understood that the fluctuation of wind velocities showeda rising tendency by the more change of wind direction.

DOI： 10.14887/kazekosymp.18.0.000047.0

CiNii Article

Authorship：Lead author   Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

風や地震などの動的荷重に対する構造物の応答評価に，従来のフーリエ解析に代えて，非定常な現象を直接扱うことができるウェーブレット解析を用いた評価方法を開発し，この手法により自然風の下での正方形断面弾性模型の風応答と減衰特性の関係を示した。また，地震に対する弾性応答解析結果に適用し，地動加速度による仕事と地震応答エネルギーとの関係を示すと共に、両者の位相差による偏りを考慮した応答スペクトルの補正方法を提案した。
本人担当部分：論文全般

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

自然風の下で立方体建物に作用する風圧特性を調べ，風洞実験によるものより強い局部風圧が発生することを示した。また，変動風圧に関する主成分分析の一つであるPOD解析結果に基づき，この強い局部風圧が風向変化とそれに伴う渦の挙動により発生することを明らかにした。
本人担当部分：野外実験（模型・風速計の設置，測定システムの開発・管理）全般とともに，POD解析の実施と解析結果の解釈から流れ場と風圧場の関係に関する考察を行った。

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Single Work   International / domestic magazine：Domestic journal  

Authorship：Last author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

大規模角柱弾性模型を用いて行った実測について，複素型のウェーブレットを用いたウェーブレット解析により非定常空気力を評価方法を示した。空力減衰力と変位の振幅の関係を相互相関係数により調べ，空力減衰力が負になると変位振幅が増加することを明確に示し，この方法の有効性を示した。
本人担当部分：論文全般

Publishing type：Research paper (international conference proceedings)   Kind of work：Joint Work   International / domestic magazine：International journal  

陸屋根面上の変動風圧を，屋根勾配をパラメータとして風圧測定実験により調べた。変動風圧に関するPOD解析結果と可視化実験結果から，接近流の違いによる変動風圧特性および円錐渦の性状の変化について示した。
本人担当部分：可視化風洞実験法の開発と実験の実施，およびPOD解析の実施と解析結果の解釈に基づく屋根上の円錐渦の挙動に関する考察を行った。

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Research paper (conference, symposium, etc.)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

Authorship：Lead author   Publishing type：Research paper (scientific journal)   Kind of work：Joint Work   International / domestic magazine：Domestic journal  

This paper deals with conical vortices on a flat roof of a low­rise building when the incident flow is for oblique angle. A flow visualization technique is devised and presented that uses the inside space of the model as a mist reservoir. Flow patterns on a flat roof are investigated by means of flow visualizations with laser sheets and a strobe light. It is clarified that the sway of conical vortices is induced by the switching of vortices formed by separating flow. Also the exist of two pairs of vortices extended from the vertexes of the roof is pointed out.

Audience： Researchesrs,　Company

Audience： Researchesrs,　Company

Number of participants：300（人）

「実務者のための建築物外装材耐風設計マニュアル」出版に伴う講習会における講師

Audience： Researchesrs,　Company

「実務者のための建築物外装材耐風設計マニュアル」出版に伴う講習会における講師