Updated on 2024/04/09

写真a

 
HAYASHI Gen
 
Organization
Graduate School of Engineering Division of Urban Engineering Assistant Professor
School of Engineering Department of Urban Design and Engineering
Title
Assistant Professor
Affiliation
Institute of Engineering

Position

  • Graduate School of Engineering Division of Urban Engineering 

    Assistant Professor  2022.04 - Now

  • School of Engineering Department of Urban Design and Engineering 

    Assistant Professor  2022.04 - Now

Degree

  • 博士(工学) ( Kyoto University )

  • 修士(工学) ( Kyoto University )

Research Areas

  • Nanotechnology/Materials / Composite materials and interfaces

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering

Research Interests

  • 複合材料,橋梁工学,維持管理,モニタリング

  • 鋼構造

  • 橋梁維持管理

  • 橋梁工学

  • 橋梁ヘルスモニタリング

Research subject summary

  • (1)「土木構造用FRP部材の信頼性評価」,「FRP橋梁の橋梁応答評価および使用性の検討」
    橋梁に用いられる構造材料として,鋼やコンクリート,繊維強化ポリマー(以下,FRP),アルミニウム等がある.これまでには,主として,施工性・維持管理性に優れる橋梁を実現するため,軽量・高強度・高耐候性に優れるFRPに関する研究を進めてきた.FRPは,2種類以上の素材から構成される複合材料であり,材料物性値にばらつきを有することから,合理的な設計を行うためには,そのばらつきを定量的に評価する必要がある.そこで,土木構造用GFRP部材から切り出して製作した試験片を用いて,材料試験を実施して,FRP材の材料物性値のばらつきを統計的に評価する.
    また,優れた材料特性を持つFRPを土木構造物に適用することにより,ライフサイクルコストに有意な構造物が期待できる.一方,前述したように,FRPは,金属材料に比べて,材料物性値がばらつくため,それらがFRPで構成される構造部材や橋梁の応答性能にどのような影響を及ぼすかを検討する必要がある.特に,FRP橋梁の動的応答性能は,報告されている研究も少なく,設計指針においても,減衰定数の推奨値が提案されていない状況であり,供用中の橋梁に対して現地計測を実施し,構造解析モデルを用いて振動使用性などの動的応答性能の検討を行う.

    (2)「鋼・PC橋梁の橋梁性能評価の現地載荷実験および振動モニタリング」
    我が国の橋梁のおよそ半数が高度経済成長期に建設されたものであり,橋梁の老朽化・劣化の進展に対する維持管理が大きな課題となっている.その中で,簡易的かつ迅速な橋梁の維持管理手法の一つである振動ヘルスモニタリングに着目し,その有効性について実橋梁を用いた損傷実験や構造解析を通して検討を行う.現地実験では,鋼橋やPC橋に対して,模擬き裂を導入,耐荷力実験を実施し,各損傷度における振動特性の変化を明らかにする.また,現地モニタリングによる観測情報と数値シミュレーションを組み合わせ,客観的かつ容易に実応答に基づいてFEモデルの再現性を高めるデータ同化手法を用いて構造解析モデルを構築する.さらには,これらの構造解析モデルを用いて,支承部性状の変化や,損傷度をFEモデル上で再現することにより,損傷による振動数の変化のメカニズムを解明する.FRP歩道橋,鋼橋,PC橋等の実橋梁に対して,静的・動的載荷実験を実施し,橋梁の応答性能について検討を行う.

Professional Memberships

  • 日本材料学会

    2023 - Now

  • 日本鋼構造協会

    2021 - Now   Domestic

  • 日本複合材料学会

    2016 - Now   Domestic

  • 土木学会

    2014 - Now   Domestic

Committee Memberships (off-campus)

  • 大阪モノレール被災対策アドバイザー   大阪高速鉄道株式会社  

    2020.10 - 2022.03 

Awards

  • 鋼構造年次講演会優秀発表賞

    2022.11   日本鋼構造協会   支点上補剛材の下端が欠損した鋼I桁供試体の3点曲げ実験

  • 土木学会 令和3年度土木学会全国大会第76回年次学術講演会 優秀講演者賞

    2021.10  

Job Career (off-campus)

  • Osaka Metropolitan University School of Engineering Department of Urban Design and Engineering

    2022.04 - Now

  • 京都大学大学院工学研究科   非常勤研究員

    2019.04 - 2020.03

Education

  • Kyoto University   Doctor's Course   Accomplished credits for doctoral program

    2016.04 - 2019.03

  • Kyoto University   Master's Course   Graduated/Completed

    2014.04 - 2016.03

  • Chubu University     Graduated/Completed

Papers

  • GFRP材料の機械的特性に対する高温域の温度サイクルの影響 Reviewed

    橋本国太郎, 林厳

    材料   2024.05

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    Publishing type:Research paper (scientific journal)  

  • BENDING EXPERIMENTS ON BASE FRICTIONAL JOINTS OF FULL-SCALE GFRP BRIDGE BARRIERS Reviewed

    Gen HAYASHI, Masaki SEKIMOTO, Takashi YAMAGUCHI, Keigo KUBO, Keiichi SAKAI, Kai AOKI

    Japanese Journal of Japan Society of Civil Engineers   2024.05

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

  • STRUCTURAL PERFORMANCE ON GFRP BRIDGE BARRIERS BASE JOINT LOAD BEARING CAPACITY APPLIED BENDING MOMENT Reviewed

    Masaki SEKIMOTO, Gen HAYASHI, Takashi YAMAGUCHI, Toshie Habukawa, Keigo KUBO, Keiichi SAKAI

    Japanese Journal of Japan Society of Civil Engineers   2024.05

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

  • 母材に皿型加工を有する皿型高力ボルト1面摩擦接合継手の力学的挙動 Reviewed

    小西美里, 山口隆司, 林厳, 吉見正頼

    鋼構造論文集   2024

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  • Experimental Study on Long Friction-Type Bolted Joint Combined with Interference Fit Bolt Reviewed

    Yu Chen, Takashi Yamaguchi, Gen Hayashi, Motoshi Yamauchi, Ueno Keita

    Advances in Bridge Engineering   2024

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  • Mechanical behavior of hybrid joint with bearing-type and slip-critical bolted connections Reviewed

    Yu Chen, Takashi Yamaguchi, Gen Hayashi, Motoshi Yamauchi, Keita Ueno

    Journal of Constructional Steel Research   211   108172 - 108172   2023.12( ISSN:0143-974X

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jcsr.2023.108172

  • Vibration characteristics and load-carrying capacity of multiple steel plate girder bridges with corroded girder ends Reviewed

    Gen Hayashi, Ryoga Oura, Aoi Hiraoka, Takashi Yamaguchi

    Structure and Infrastructure Engineering   1 - 14   2023.06( ISSN:1573-2479

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.1080/15732479.2023.2218354

  • Effect of surface treatment on slipping behavior of hot-dip galvanized high-strength bolted friction GFRP joints Reviewed

    Masaki SEKIMOTO, Gen HAYASHI, Takashi YAMAGUCHI, Keigo KUBO, Keiichi SAKAI, Kai AOKI

    Japanese Journal of JSCE   79 ( 14 )   1 - 13   2023.05

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.2208/jscejj.22-14003

  • Effect of the corrosion degree of BP-A bearings on the horizontal and rotational movement following performance and horizontal forces of lower flange Reviewed

    Aoi Hiraoka, Gen Hayashi, Takashi Yamaguchi

    Journal of Structural Engineering, A   69A   202 - 214   2023.02

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

    DOI: 10.11532/structcivil.69A.202

  • Influence of Intermediate Hinge Damage on Bridge Response and Modal Parameters of Cantilever-Suspended Girder Bridge Reviewed

    Aoi Hiraoka, Gen Hayashi, Takashi Yamaguchi

    Lecture Notes in Civil Engineering   254 LNCE   745 - 753   2023( ISSN:2366-2557 ( ISBN:9783031072574

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    Cantilever-suspended girder bridges are provided with intermediate hinges to reduce the effects of support settlement, including damage to hinge bearings caused by corrosion. To inspect, repair, and efficiently maintain these bridges, it is necessary to develop a monitoring technology. Accordingly, research have been conducted on a bridge response health-monitoring technology. In particular, the properties of bearings significantly influence the vibration characteristics of bridges. However, previous studies are yet to examine changes in bridge response due to the corrosion of hinge bearings. Using finite element analysis (FEA), this study aimed to investigate changes in the bridge response and modal parameters of cantilever-suspended girder bridges due to the corrosion damage levels of the hinge bearings. In the FEA, model-installed elastic spring was used shell elements. Furthermore, static and eigenvalue analyses were conducted. Static analysis demonstrated that the target bridge type exhibited more minor changes in its girder deflection due to bearing corrosion. In addition, the effects were quantitatively determined by altering the corrosion position of the hinge bearing in the bridge.

    DOI: 10.1007/978-3-031-07258-1_75

  • Load Carrying Capacity and Vibration Characteristics of PC Box Girders with Damage Reviewed

    K. Takemura, Chul Woo Kim, G. Hayashi, E. Yoshida

    Lecture Notes in Civil Engineering   224   619 - 630   2023( ISSN:2366-2557 ( ISBN:9783030932350

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    This study is intended to examine changes in modal parameters PC box girders due to defective grouting and failures in PC tendons through a laboratory experiment. In the laboratory experiment, three PC box girders, which have different damage scenarios, are examined. Both static loading and vibration experiments were conducted. The static loading experiment was performed with 4-point bending loading, and as vibration experiment, the impact hammer test was applied. This study investigates the relationship between the energy-based bending performance adopted as a load carrying capacity, and frequencies of the PC box girders. The static loading test showed that local cracks were dominated around the location of defective grouting and failure of PC tendons, and energy-based bending performance evaluated from load–displacement curve, decreased according to loading process. Frequencies of bending modes showed a decreasing tendency but showed fluctuations as loading progresses. A moderate correlation was observed between the energy-based bending performance and the natural frequency of 1st and 2nd bending modes.

    DOI: 10.1007/978-3-030-93236-7_51

  • Numerical exploration of a high strength and durability non-projected and sandglass-shaped bolt for steel structures' connection Reviewed

    Tatsuya Hashimoto, Hitoshi Moriyama, Gen Hayashi, Takashi Yamaguchi, Masayori Yoshimi

    In press   2023

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  • THREE-POINT BENDING TEST OF STEEL I-GIRDER WITH CORRODED STEEL GIRDER END Reviewed

    Gen HAYASHI, Yu LANG, Hitoshi MORIYAMA, Takashi YAMAGUCHI

    30   241 - 252   2022.11

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  • THE EFFECT OF SURFACE TREATMENT ON HIGH-STRENGTH BOLTED FRICTION GFRP JOINTS IN SLIP RESISTANCE Reviewed

    Masaki SEKIMOTO, Gen HAYASHI, Takashi YAMAGUCHI, Keigo KUBO, Keiichi SAKAI, Kai AOKI

    146 - 155   2022.11

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  • LONG-TERM RELAXATION CHARACTERISTICS OF HOT-DIP GALVANIZED HIGH-STRENGTH BOLTED FRICTION GFRP JOINTS Reviewed

    Kai AOKI, Gen HAYASHI, Masaki SEKIMOTO, Takashi YAMAGUCHI, Keigo KUBO, Keiichi SAKAI

    136 - 145   2022.11

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  • ANALYTICAL STUDY ON SLIP BEHAVIOR AND COMPOSITE EFFECT FOCUSING ON THE JOINT STRUCTURE BETWEEN CAST IRON DECK MODULES AND STEEL MAIN GIRDER Reviewed

    SHIRAI Yugo, HAYASHI Gen, MATSUI Shun, YAMAGUCHI Takashi, YAMASHITA Ryo, TOBINAGA Hironobu

    Kou kouzou rombunshuu   29 ( 114 )   114_37 - 114_46   2022.06( ISSN:1880-9928

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    The cast iron deck modules is a lightweight deck slab with excellent fatigue resistance. Friction joint are used to join the cast iron deck modules and the main girder. In this study, the effect of the structural type of the support member between the deck and the girder on the slip behavior and composite effect are investigated by FE analysis. As a result, the reduction rate of the slip coefficient due to the difference in shape of the support member between the cast iron deck module and the main girder was evaluated from the coefficient calculated by multiplying the friction coefficient by the correction coefficient of slip coefficient.

    DOI: 10.11273/jssc.29.114_37

  • Study on the mechanism of load transferring of riveted joints with high strength bolts as frictional joints Reviewed

    CHEN Yu, YAMAGUCHI Takashi, YAMAUCHI Motoshi, UENO Keita, HAYASHI Gen

    Kou kouzou rombunshuu   29 ( 113 )   113_1 - 113_14   2022.03( ISSN:1880-9928

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    Currently, the remaining riveted bridges are almost over 60 years old. Therefore, the rivets are corroded and loosen over time, deteriorated the condition of the bridges further. Previous studies have shown that replacing the riveted joints with a high-strength bolt for friction is considered the best approach to repairing the riveted joint in steel bridges. However, the current state is that the load transfer mechanism of the rivet and high-strength bolt friction joints is still unknown, and the load capacity of the combined joint has not been sufficiently discussed. Technical standards and design methods for repair have not been established. This study examined the load transfer mechanism and repair application range of the combined joint using the tensile test and FEM analysis.

    DOI: 10.11273/jssc.29.113_1

    J-GLOBAL

  • Slip behavior between cast iron deck module and steel main girder using high strength bolted frictional joints with slotted hole Reviewed

    Yugo Shirai, Gen Hayashi, Shun Matsui, Takashi Yamaguchi, Ryo Yamashita, Hironobu Tobinaga

    68 ( A )   505 - 516   2022.03

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    DOI: 10.11532/structcivil.68A.505

  • EFFECT OF THERMAL CYCLE TIME ON THE MECHANICAL PROPERTIES OF GFRP MATERIALS Reviewed

    OKAI Daiki, HASHIMOTO Kunitaro, HAYASHI Gen

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   78 ( 5 )   II_42 - II_53   2022( ISSN:2185-4653

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    FRP is a composite material made by mixing fiber such as glass with resin plastic to increase its strength. In this study, focusing on the temperature application time when performing the thermal cycle application test and the dry treatment before tensile and bending tests, the temperature cycle application test was conducted in which the time of one cycle was changed for GFRP using unsaturated polyester resin. After that, a tensile test and a flexural test are performed, and the purpose is to clarify the change in mechanical properties of the target material depending on the temperature application time and water content. As a result, it was found that tensile and bending properties were not affected much by the temperature application time in the case of non-drying treatment before the cyclic test, and that strength were affected by the thermal cycle in the case of drying treatment.

    DOI: 10.2208/jscejseee.78.5_ii_42

    J-GLOBAL

  • Slipping Behavior and Relaxation Characteristics of Thin-Walled GFRP High-Strength Bolted Friction Joints for Sound Barriers on Bridge Viaducts Reviewed

    Masaki Sekimoto, Gen Hayashi, Takashi Yamaguchi, Keiichi Sakai, Kai Aoki, Keigo Kubo

    IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation, Report   490 - 497   2022( ISBN:9783857481840

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    This study aimed to clarify the performance of high-strength bolted joints for thin-walled glass-fiber-reinforced polymer (GFRP) members by conducting slip tests and long-term relaxation tests. The parameters of the slip test were the FRP surface treatment, bolt axial force, and bolt hole diameter. Relaxation characteristics might also be affected by variations in fiber content based on differences in production lots. Hence, samples from different production lots were taken. However, in these tests, the influence of all parameters was relatively minimal. One year after tightening, the axial force reduction gradually subsided and tended toward convergence. However, because it is difficult to determine convergence based on temperature changes, long-term measurements will continue. In the slip tests, the highest slip coefficient was obtained when the GFRP was coated with fluoroplastic and the connecting plates were treated with phosphate. This study proposes a design slip coefficient for GFRP high-strength bolted friction joints.

  • Prototype of no-projected and Sandglass-shaped Bolt with High-Strength and Durability for Efficient Steel Structures Maintenance Reviewed

    Tatsuya Hashimoto, Gen Hayashi, Takashi Yamaguchi, Hitoshi Moriyama

    IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report   602 - 609   2022( ISBN:9783857481833

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    High-strength frictional bolted joints in civil engineering structures are corroded due to the thin coating thickness at the corners of the bolts and the nuts. A sandglass-shaped bolt composed of a countersunk head bolt and countersunk sleeve nut is being developed to secure the constant coating thickness and prevent corrosion. As its thread diameter is smaller than the usual one by the mechanism, an ultra-high-strength material must be applied to require the same fastening capacity as conventional bolts while considering stress concentration related to hydrogen embrittlement. This paper proposes a novel thread shape for the prototype of the sandglass-shaped bolt, whose stress concentration factor can be reduced by more than 30% current standard thread in Japan, focused on the magnitude of stress concentration. Moreover, FE analysis reveals the general fastening performance by comparing with or without the proposed thread.

  • Load transferring mechanism of long riveted joint partially replaced by high-strength bolts Reviewed

    Yu Chen, Ryo Sakura, Takashi Yamaguchi, Gen Hayashi, Motoshi Yamauchi, Keita Ueno

    IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report   173 - 180   2022( ISBN:9783857481833

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    Rivet joints are widely applied in the connections of steel bridges prior to 1950 owing to their tightness and strength. Some rivets become loosened or corroded after repeated loading and long-term usage. Previous studies indicate that replacing riveted joints with a high-strength bolt to achieve friction may be the best approach for repairing a riveted joint. However, for a long riveted joint, which has an uneven load distribution, the removal of individual rivets may overload the other rivets. This study focuses on long riveted joints at the bottom flange of an actual riveted bridge. The load redistribution mechanism involved when the rivet is removed under a dead load is investigated by performing a finite element (FE) simulation. The FE analysis results show that when a rivet is replaced by a bolt, the rivet's load transferring ability is affected more by rivets near the bolts, whereas more distant rivets pose almost no effects.

  • Experimental study of change in load carrying capacity and vibration characteristics of PC box girders with defective grout and failures in tendons Reviewed

    67 ( 0 )   195 - 207   2021.03

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  • Effect of surface treatment of countersunk hole on slip strength of friction grip joints with high strength countersunk head bolts Reviewed

    67 ( 0 )   349 - 359   2021.03

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  • Slip behavior between cast iron deck module and a steel main girder using tapered high strength bolted frictional joints with 1° on the main plate Reviewed

    67 ( 0 )   336 - 348   2021.03

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  • Experimental investigation on damage and wave propagation of PVB laminated glazing structures under impact loading Reviewed

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    Elsevier BV Structures   29   966 - 978   2021.02( ISSN:2352-0124

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    DOI: 10.1016/j.istruc.2020.12.003

  • BONDING SPLICE BEHAVIOUR AND FAILURE MODE ABOUT DAMAGED GFRP PLATE Reviewed

    Akihiko SATO, Gen HAYASHI, Yasuo KITANE, Kunitomo SUGIURA

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   77 ( 1 )   13 - 27   2021.01

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    DOI: 10.2208/jscejseee.77.1_13

  • EFFECT OF THERMAL CYCLE TIME ON THE MECHANICAL PROPATIES OF GFRP MATERIALS Reviewed

    岡井大樹, 橋本国太郎, 林厳

    複合・合成構造の活用に関するシンポジウム講演集(CD-ROM)   14th   2021( ISSN:2189-8464

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    J-GLOBAL

  • Changes in Natural Frequencies of a Steel Plate Girder Bridge Under Local Damage and Varying Temperatures Reviewed

    620 - 628   2020.11

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  • Residual Performance of Steel Sheet Pile with Corrosion Damage Reviewed

    94 - 101   2020.11

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  • Investigation about temperature-dependence of tensile properties of hand lay-up molded GFRP material Reviewed

    Hayashi Gen, Kitane Yasuo, Sato Akihiko, Sugiura Kunitomo, Nishizaki Itaru, Hibi Hideki

    Japan Society of Civil Engineers, Journal of Structural Engineering, A   66 ( 0 )   886 - 894   2020

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    <p>This study presents basic data on temperature dependence of mechanical properties of GFRP materials. First, coupon specimens are collected from GFRP plates by hand lay-up molding. Then, material tests are conducted under different temperature environments to clarify the relationship between temperature and tensile properties. In order to receive repeated temperature histories in the actual environment, a tensile test was also performed on the cooled material after heating. As a result, it was found that the tensile performance of GFRP decreases as the temperature of the specimen increases. It was also found that the specimens that had undergone the cooling process after heating had the same tensile performance as the initial state.</p>

    DOI: 10.11532/structcivil.66A.886

    CiNii Article

  • PERFORMANCE EVALUATION OF COMPRESSION AND BENDING OF GFRP CHANNEL MEMBER CONSIDERING MATERIAL VARIATION Reviewed

    HAYASHI Gen, KITANE Yasuo, GOI Yoshinao, SUZUKI Yasuo, SUGIURA Kunitomo, NISHIZAKI Itaru

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   76 ( 1 )   110 - 125   2020

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    <p> Fiber Reinforced Polymer, FRP provides unique mechanical properties like high strength, high corrosion resistance, light weight and so on. FRP is a composite material composed of fiber/resin material, and it is possible to make versatile material design. Therefore, material properties like strength, elastic modulus may diverse. Statistical evaluation on material properties is needed to understand the response of FRP composites. This study aims to investigate compressive and bending properties of Glass Fiber Reinforced Polymer, GFRP manufactured as channel cross section by hand lay-up molding. Coupon test specimens which was cut from several locations of the GFRP channel members, are used in tensile and compressive test. Then, influences of changing the sampling positions of the specimens on the channel section against compressive and bending characteristics of them are discussed. In addition, Monte Carlo simulation is performed by using the tested data to evaluate compressive and bending statistically behavior of such a cross sections of the member.</p>

    DOI: 10.2208/jscejseee.76.1_110

    CiNii Article

  • Evaluation of static and dynamic characteristics of GFRP pedestrian girder bridge considering variation in material properties Reviewed

    Hayashi Gen, Kim Chul-Woo, Sugiura Kunitomo, Suzuki Yasuo, Hibi Hideki

    Japan Society of Civil Engineers, Journal of Structural Engineering, A   66 ( 0 )   329 - 339   2020

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    <p>The purpose of this study is to elucidate the effect of variations in material properties of GFRP materials on the response performance of pedestrian bridges. First, the static loading test and the vibration test are performed on the actual GFRP pedestrian girder bridge assembled in the factory before completion, and the response performance of the bridge is evaluated. Then, the response analysis of the actual bridge was performed using the constructed finite element model. In addition, the performance of the bridge is statistically evaluated by conducting Monte Carlo simulation assuming the variation of material properties.</p>

    DOI: 10.11532/structcivil.66A.329

    CiNii Article

  • Influence of changes in structural behavior at supports for vibration monitoring under local damage and varying temperature Reviewed

    T. Hirooka, C. W. Kim, G. Hayashi, Y. Goi

    Life-Cycle Civil Engineering: Innovation, Theory and Practice - Proceedings of the 7th International Symposium on Life-Cycle Civil Engineering, IALCCE 2020   313 - 319   2020( ISBN:9780367360191

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    This study aims to investigate how local damage and varying temperature affect changes in vibration characteristics and structural behavior of a steel plate girder bridge. A damage experiment on a real bridge was conducted. Artificial cracks were applied to the lower flange and web plate near base plate of shoe. Observations showed that the 1st bending frequency increased due to artificial damage even though the 2nd bending frequency and 3rd bending frequency decreased. Finite element model was constructed and updated to clarify the cause of such frequency changes for each mode. FE analysis demonstrated that the 1st bending mode was more sensitive to changes in the boundary condition than changes in stiffness of the girder. The FE analysis is also showed that structural behaviors of supports were affected by stiffness reduction of the girder due to local damage as well as by thermal expansion due to varying temperature.

    DOI: 10.1201/9780429343292-37

  • Reduction method of stress concentration in GFRP repairing Reviewed

    A. Sato, G. Hayashi, Y. Kitane, K. Sugiura

    Life-Cycle Civil Engineering: Innovation, Theory and Practice - Proceedings of the 7th International Symposium on Life-Cycle Civil Engineering, IALCCE 2020   789 - 796   2020( ISBN:9780367360191

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    GFRP is a composite material which has high specific strength, high durability, brittleness and anisotropy. It is adopted to a primary member of civil structures such as water gates and pedestrian bridges. However, a repairing method for damaged GFRP has not been established yet. Therefore, the focus of this study is on GFRP repairing, and bonding repair plates on the both sides of GFRP plate is considered as a repairing method. In a previous study, it was confirmed that stress concentration occurred by bonding repair plate on the GFRP. Therefore, this study aims to investigate the reduction method of stress concentration at the end of repair plates. Firstly, by altering shapes of the end of the repair plates, the reduction of stress concentration was evaluated using FE analysis. Secondly, uniaxial tensile tests were conducted. In the experiment, both Intact and repair plate-bonded specimens were prepared.

    DOI: 10.1201/9780429343292-104

  • A Statistical Response of GFRP Channel Member Subjected to Tension, Compression and Bending Reviewed

    G. Hayashi, Y. Kitane, K. Sugiura, I. Nishizaki

    13th International Conference on the Mechanical Behaviour of Materials (ICM13)   138 - 147   2019.12

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  • Vibration Monitoring of A Real Steel Plate Girder Bridge Under Artificial Local Damage and Varying Temperature Reviewed

    Takumi Hirooka, Chul-Woo Kim, Gen Hayashi, Yoshinao Goi

    16th East Asia-Pacific Conference on Structural Engineering & Construction   2019.12

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  • Fundamental study on Bond and Splice Behaviour of a GFRP Repairing System for Damaged GFRP Members Reviewed

    A. Sato, G. Hayashi, M. Matsumura, H. Hibi, K. Sugiura

    13th International Conference on the Mechanical Behaviour of Materials (ICM13)   116 - 125   2019.12

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  • Influence of Local Damage and Change in Boundary Condition on Frequency Changes of A Steel Plate Girder Bridge Reviewed

    Chul-Woo Kim, Takumi Hirooka, Yoshinao Goi, Gen Hayashi, Takuya Mimasu

    12th Pacific Structural Steel Conference   2019.11

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  • Changes in Modal Frequencies of A Steel Plate Girder Caused by local Damage and Thermal Expansion Reviewed

    Chul-Woo Kim, Takumi Hirooka, Takuya Mimasu, Yoshinao Goi, Gen Hayashi

    9th ECCOMAS Thematic Conference on Smart Structures and Materials   2019.07

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  • RELATIONSHIP BETWEEN BRIDGE PERFORMANCE AND MODAL PROPERTIES BASED ON FIELD STATIC LOAD AND VIBRATION TESTS Reviewed

    KONDO Yosuke, HAYASHI Gen, OSHIMA Yoshinobu, KIM Chul-Woo

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   75 ( 2 )   I_51 - I_62   2019

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    <p>This study aims to examine how changes in load resistance capacity of a prestressed concrete bridge (PC bridge) influence on their modal properties. Static loading test was carried out under step-by-step loading until failure. In addition, forced vibration tests were carried out along the static loading test in order to assess the changes in the modal properties of the PC bridge with different health conditions. Energy performance calculated by load-displacement relation is used in order to estimate the structural performance of the PC bridge. Observations showed strong relationships between 2nd bending modal frequency and the level of structural performance. This indicates the usefulness of the 2nd bending mode in vibration-based bridge health monitoring for PC bridges.</p>

    DOI: 10.2208/jscejam.75.2_I_51

    CiNii Article

  • A STATISTICAL EVALUATION OF TENSILE PROPERTIES OF GFRP CHANNEL MEMBER Reviewed

    HAYASHI Gen, SUZUKI Yasuo, SUGIURA Kunitomo, NISHIZAKI Itaru, KITANE Yasuo

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))   75 ( 3 )   293 - 304   2019

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    <p> Fiber Reinforced Polymer (FRP) provides superior mechanical properties such high strength, high corrosion resistance, light weight etc.. As a volume fraction of fibers of FRP members influences significantly on the mechanical properties, that also depends on manufacturing process, therefore it is necessary to assess the material properties of different volume fraction of fibers to make sure the sectional capability enough with respect to the construction requirement.</p><p> This study aims to investigate tensile properties of Glass Fiber Reinforced Polymer (GFRP) manufactured as channel cross section by hand lay-up molding method and pultrusion molding method. Coupon test specimens which was cut from several locations of the GFRP channel members, are used in tensile test. Then, influences of changing the sampling positions of the specimens on the channel section against tensile strength, elastic modulus are discussed. In addition, Monte Carlo simulation is performed by using the statistical model of tested data to evaluate tensile properties in the entire cross sections of FRP member.</p>

    DOI: 10.2208/jscejseee.75.293

    CiNii Article

  • Investigations on increase and decrease of frequencies of a steel plate girder bridge due to artificial cracks Reviewed

    C. W. Kim, T. Mimasu, Y. Goi, G. Hayashi

    9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019 - Conference Proceedings   1   689 - 694   2019

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    © 2019 9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019 - Conference Proceedings. All rights reserved. This paper is intended to discuss changes in modal parameters due to artificial fatigue cracks that propagated from the base plate of bearings to the web plate of a steel plate girder bridge through vibration and damage experiments. During the experiments the bridge was excited by a moving vehicle and the resulting acceleration signals are used to identify modal parameters. First three bending modes and first two torsional modes were successfully identified. It was observed that identified natural frequencies were changed due to artificial fatigue cracks. However, the frequencies for the first bending and first torsional modes were increased due to the cracks, while the frequencies for other three modes were decreased due to the cracks. Observations from the static loading test showed that the longitudinal displacement at a support purely under vehicle loading was decreased as the crack propagates, which demonstrated that changes in boundary condition can be a major reason for the increase of the first bending and torsional modes due to damage. The sensitivity analysis for the change in the natural frequencies under varying spring constants showed that these two modes were more sensitive to the change in boundary condition than stiffness changes. On the other hands frequencies of other three modes were more sensitive to varying stiffness than change in the boundary condition.

  • Vibration characteristics identification and FE modeling of a GFRP truss pedestrian bridge Reviewed

    Hayashi Gen, Goi Yoshinao, Kim Chul-Woo, Sugiura Kunitomo

    Japan Society of Civil Engineers, Journal of Structural Engineering, A   65 ( 0 )   317 - 328   2019( ISSN:1881-6614

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    <p>This paper presents the results of a real bridge field experiment, carried out on a glass fiber reinforced polymer (GFRP) pedestrian truss bridge of which nodes are reinforced with stainless steel plates. The aim of this paper is to identify the modal properties of this bridge by using both conventional techniques and a model updating algorithm. Pedestrian-induced vibrations are also measured and utilized to identify modal properties of the bridge. A stochastic subspace identification combined with stabilization diagram was utilized to identify modal properties of the bridge. Moreover, an FE model capable of reproducing experimental results was constructed using the cross-entropy method.</p>

    DOI: 10.11532/structcivil.65A.317

    CiNii Article

  • Monitoring of flexural strain waves induced by impact on laminates glass Reviewed

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    7th International Conference on Protection of Structures against Hazards   2018.10

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  • Model Update of A Steel Arch Bridge by Means of Particle Filter Reviewed

    396 - 403   2018.10

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  • Vibration monitoring and damage experiment on an actual steel plate girder bridge Reviewed

    Chul-Woo Kim, Yoshinao Goi, Gen Hayashi, Takuya Mimasu

    6th International Symposium on Reliability Engineering and Risk Management (6ISRERM)   2018.05

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  • Damage and wave propagation characteristics in thin GFRP panels subjected to impact by steel balls at relatively low-velocities Reviewed

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    PERGAMON-ELSEVIER SCIENCE LTD INTERNATIONAL JOURNAL OF IMPACT ENGINEERING   111   21 - 33   2018.01( ISSN:0734-743X

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    Publishing type:Research paper (scientific journal)  

    An experimental investigation was conducted to determine the damage and wave propagation characteristics in Glass Fibre Reinforced Polymer (GFRP) panels subjected to impact by steel balls at relatively low-velocities up to 91 ms(-1). While maintaining the same impact energy level, the influence of ball mass on panel response was studied. The effects of composite lay-up sequence and successive impacts were also investigated. The wave propagation characteristics, including wave types, wave velocities, wave attenuations, and strain rates, were extracted from dynamic strain records measured at various locations on the panels. The results showed that, for the same level of impact energy, the small ball mass produced larger deformation and delamination than the large ball mass. Additionally, the resistance to impact was influenced by the composite lay-up sequence of similar fibre weight fraction. Test panels subjected to successive impacts showed an increase in cumulative delamination areas, whereas the tests indicated that successive impacts had a little effect on the perforation limit of the test panels. The impact velocity showed a pronounced influence on the measured peak strains and strain rates. The flexural wave was the predominant wave system, propagating at different velocities in different directions. In proximity to the impact site, both flexural wave and indentation predominated over the transient response. In addition to the flexural wave, impact induced low amplitude tensile longitudinal waves of high velocity. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijimpeng.2017.08.007

  • INVESTIGATIONS ON CHANGES IN MODAL PROPERTIES CAUSED BY DAMAGES ON A REAL STEEL PLATE GIRDER BRIDGE Reviewed

    MIMASU Takuya, KIM Chul-Woo, GOI Yoshinao, HAYASHI Gen

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_513 - I_522   2018

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    This paper investigates changes in modal properties of a steel plate gider bridge due to artificial damages at the girder end. The modal properties are identified from vehicle-induced vibration data measured during the damage experiment on the bridge. Stochastic subsupace identification (SSI) is adopted to identify modal properties of the bridge, and dominant modes are extracted by means of stabilization diagram (SD). Observation demonstrates feasibility of damage detection from changes in modal properties. In order to examine the mechanism of the change, eigenvalue analysis utilizing finite element model with artificial damages is carried out. The mechanism of increasing frequency for the first bending mode is discussed by means of sesnsitivity analysis. Observations showed that the first bending mode is more greatly affected by changes in boundary condition due to damage than those changes in stiffness due to the damage. It is noted that in vibration-based bridge health monitoring it needs to consider the influence of change in boundary conditions at the supports.

    DOI: 10.2208/jscejam.74.I_513

    CiNii Article

  • FE MODELING OF A STEEL PLATE TWIN GIRDER BRIDGE USING PARTICLE FILTER Reviewed

    HAYASHI Gen, KIM Chul-Woo, MIMASU Takuya, GOI Yoshinao, YOSHIDA Ikumasa, SUGIURA Kunitomo

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_705 - I_714   2018

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    This paper discusses about on-site long term monitoring static and moving vehicle experiments on a composite twin girder bridge, and also investigates validity of an FE model constructed utilizing assumed structural properties from existing inspection documents as well as a visual inspection. The feasibility of a particle filter aided FE mode updating was also examined. In the model updating, the frequencies for the first and second bending modes were considered as design variables in the cost function.Those identified parameters from the model updating were compared with those from material experiments of which specimen were obtained formt the observation bridge. Observations showed that the roller support was not functioning due to deterioration. The updated FE model led to comparable results with those from field experiments.

    DOI: 10.2208/jscejam.74.I_705

    CiNii Article

  • Transient dynamic analysis of laminated glass panels under impact loading Reviewed

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    2nd International conference on structural safety under fire & blast loading   2017.10

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  • Numerical simulation of wave-controlled impact on composite laminates Reviewed

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    12th International Conference on Shock & Impact Loads on Structures   2017.06

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  • Monitoring and model updating of an FRP pedestrian truss bridge Reviewed

    G. Hayashi, C. W. Kim, Y. Suzuki, K. Sugiura, P. J. McGetrick, H. Hibi

    Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016   756 - 763   2017

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    © 2017 Taylor & Francis Group, London. This paper presents the results of real bridge field experiment, carried out on a fiber reinforced polymer (FRP) pedestrian truss bridge of which nodes are reinforced with stainless steel plates. The aim of this paper is to identify the dynamic parameters of this bridge by using both conventional techniques and a model updating algorithm. In the field experiment, the bridge was instrumented with accelerometers at a number of locations on the bridge deck, recording both vertical and transverse vibrations. It was excited via jump tests at particular locations along its span and the resulting acceleration signals are used to identify dynamic parameters, such as the bridge mode shape, natural frequency and damping constant. Pedestrianinduced vibrations are also measured and utilized to identify dynamic parameters of the bridge. For a complete analysis of the bridge, a numerical model of the FRP bridge is created whose properties are calibrated utilizing a model updating algorithm. Comparable frequencies and mode shapes to those from the experiment were obtained by the FE models considering the reinforcement by increasing elastic modulus at every node of the bridge by stainless steel plate. Moreover, considering boundary conditions at both ends as fixed in the model resulted in modal properties comparable/similar to those from the experiment. This study also demonstrated that the effect of reinforcement and boundary conditions must be properly considered in an FE model to analyze real behavior of the FRP bridge.

  • MODAL PROPERTIES IDENTIFICATION OF AN FRP PEDESTRIAN BRIDGE WITH REINFORCEMENT AT NODES AND FE MODEL Reviewed

    KIM Chul-Woo, HAYASHI Gen, SUZUKI Yasuo, HASHIMOTO Kunitaro, SUGIURA Kunitomo, HIBI Hideki

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   71 ( 2 )   I_841 - I_848   2015

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    This paper aims to investigate dynamic characteristics of an FRP truss pedestrian bridge in service by means of field vibration test and eigenvalue analysis. Pedestrian-induced vibrations are also measured and utilized to identify dynamic parameters of the bridge. A multivariate autoregressive model combined with stabilization diagram was utilized to identify modal properties of the bridge. Every node of the bridge is reinforced by stainless steel plate, and FE models considering the reinforcement by increasing Youg's modulus led to comparable frequencies and mode shapes to those from observed in the test. Moreover as a boundary condition at both ends fix model resulted in a comparable modal properties to experimental ones. This study also demonstrated that the effect of reinforcement and boundary conditions have to be properly considered in an FE model to analyaze real behaviour of the FRP bridge.

    DOI: 10.2208/jscejam.71.I_841

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MISC

  • GFRP壁高欄基部接合部のボルト配置が曲げ性能に及ぼす影響

    関本将貴, 林厳, 山口隆司, 久保圭吾, 酒井圭一, 青木海

    第 15 回複合・合成構造の活用に関するシンポジウム講演集(CD-ROM)   384 - 394   2023.11

  • 既設鋼I桁の高力スタッドボルトを用いた当て板補強に関する解析的検討 Reviewed

    鈴木恵斗, 山本佑大, 奥村学, 石黒陽菜, 山口隆司, 林厳

    第31回鋼構造年次報告集   31   87 - 92   2023.11

  • 実大GFRP壁高欄基部接合部の曲げ載荷実験

    酒井圭一, 林厳, 関本将貴, 山口隆司, 青木海, 久保圭吾

    第 15 回複合・合成構造の活用に関するシンポジウム講演集(CD-ROM)   376 - 383   2023.11

  • Performance of Joint Structure of Bent L‐Shaped Steel Members for GFRP Wall Railings Reviewed

    Masaki Sekimoto, Gen Hayashi, Takashi Yamaguchi, Keigo Kubo

    ce/papers   6 ( 5 )   1446 - 1454   2023.09( ISSN:2509-7075 ( eISSN:2509-7075

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    Abstract

    Glass fibre reinforced polymer (GFRP) has excellent material properties such as light weight and corrosion resistance, and has been applied to bridge appendages such as wall railings. In this case, bent L‐shaped steel members (bent members) are used at the joints with the floor slab. The GFRP wall railings were designed to consider the wind loads acting on them, and the bolt holes for the anchor bolts were slotted hole for ease of installation. In this study, the effects of loading conditions and bolt arrangement of anchor bolts slotted holes in the performance of the joint structure were analytically investigated for the base joints of GFRP wall railings.

    The results presented that, in the initial stiffness of the base, the loading condition was smaller for the negative loading than for the positive loading, and the bolt arrangement was smaller on the outside than on the inside. It is shown that the incremental bolt axial force of the anchor bolts is borne by four bolts in the positive loading, however, is biased to only two bolts in the negative loading, focusing on the neutral axis position.

    DOI: 10.1002/cepa.2051

  • Behaviour of corroded bridge bearing and full-bridge modeling Reviewed

    A. Hiraoka, G. Hayashi, T. Yamaguchi

    Life-Cycle of Structures and Infrastructure Systems   555 - 561   2023.06( ISBN:9781003323020

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    DOI: 10.1201/9781003323020-66

  • Damage identification of corroded arch bridge using vibration characteristics and rotational angle Reviewed

    K. Akahoshi, G. Hayashi, Y. Chen, T. Yamaguchi

    Life-Cycle of Structures and Infrastructure Systems   562 - 569   2023.06( ISBN:9781003323020

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    DOI: 10.1201/9781003323020-67

  • Bolt axial force detection using deep learning based on vision methods Reviewed

    Y. Chen, J. Lai, G. Hayashi, T. Yamaguchi

    Life-Cycle of Structures and Infrastructure Systems   533 - 540   2023.06( ISBN:9781003323020

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  • One-sided repair of steel girder end having corroded bearing stiffeners with high-strength bolted doubler plate Reviewed

    H. Moriyama, Yu Lang, G. Hayashi, T. Yamaguchi

    Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability   1670 - 1678   2022.06( ISBN:9781003322641

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Presentations

  • Vibration properties and load-carrying capacity of damaged girder bridges

    Gen Hayashi

    The 1st Slovakia-Japan Maintenance and Monitoring Technical Exchange Workshop  2024.01 

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    Presentation type:Oral presentation (keynote)  

  • 3次元FEMによる縦リブの局部座屈を考慮した2方向面内力を受ける補剛板の耐荷力曲線に関する基礎的研究

    安田航輔, 山口隆司, 刑部清次, 林厳

    2023年度関西土木工学交流発表会  2023.11 

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  • 高力ボルト摩擦接合継手の接合面接触圧とすべり係数の関係に関する実績調査

    髙木夢菜, 佐倉亮, 山口隆司, 林厳

    2023年度関西土木工学交流発表会  2023.11 

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    Presentation type:Poster presentation  

  • 閉断面寸法とボルト本数が高力スタッドボルト一面当て板補強の荷重分担に与える影響

    石黒陽菜, 山口隆司, 林厳, 山本佑大, 鈴木恵斗, 奥村学

    2023年度関西土木工学交流発表会  2023.11 

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  • 機械学習による複数損傷を有する模型鋼アーチ橋の損傷部材・損傷位置の推定

    赤星花奈, 林厳, 山口隆司

    2023年度関西土木工学交流発表会  2023.11 

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    Presentation type:Poster presentation  

  • 支間中央部に腐食損傷を有する鋼鈑桁橋の各構成部材が橋梁システム挙動に与える影響に関する検討

    山田蓮, 山口隆司, 林厳

    2023年度関西土木工学交流発表会  2023.11 

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  • Slipping behavior and relaxation characteristics of thin-walled GFRP high-strength bolted friction joints

    Gen HAYASHI

    13th Taiwan-Japan Workshop on Structural and Bridge Engineering  2023.11 

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  • 高強度ねじ付きスタッド薄鋼板摩擦接合継手の高すべり係数化に関する解析的検討

    木山大聖, 岡本真樹, 奥原大貴, 石川誠, 吉田賢二, 山口隆司, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 高力ボルト摩擦接合継手無機ジンク接合面における接触圧と摩擦係数の関係に関する実験的検討

    髙木夢菜, 佐倉亮, 堀井いずみ, 山口隆司, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 閉断面高力スタッドボルト一面当て板補強の荷重伝達に着目したスタッド配置の解析的検討

    石黒陽菜, 山口隆司, 申啓航, 奥村学, 鈴木恵斗, 山本佑大, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 鋼箱桁橋のフランジが腹板の曲げ座屈耐荷力に与える影響に関する解析的研究

    池田未来, 山口隆司, 新井進太郎, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 砲台配置された高力ボルト摩擦接合継手のボルト配置が純断面降伏耐力に及ぼす影響

    銭霖, 佐倉亮, 山口隆司, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 片面施工摩擦支圧併用ボルトのテーパーの角度が継手の伝達荷重に与える影響に関する解析的検討

    小村政孝, 山口隆司, 林厳, 篠田佳典

    令和5年度土木学会年次学術講演会  2023.09 

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  • 橋梁システムに着目した鋼鈑桁橋支間中央部の当て板補修に関する解析的研究

    山田蓮, 山口隆司, 林厳, 有村健太郎

    令和5年度土木学会年次学術講演会  2023.09 

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  • 接合面数の違いが皿型高力ボルト摩擦接合継手のすべり耐力に及ぼす影響

    林厳, 小西美里, 山口隆司, 熊野拓志, 田中伸尚, 郎宇, 加藤大樹

    令和5年度土木学会年次学術講演会  2023.09 

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  • 基部のボルト配置がGFRP壁高欄基部の構造性能に及ぼす影響

    関本将貴, 林厳, 山口隆司, 久保圭吾, 酒井圭一, 青木海

    令和5年度土木学会年次学術講演会  2023.09 

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  • 土木構造物に用いるGFRP部材の高力ボルト摩擦接合に関する実験的研究

    林厳, 関本将貴, 山口隆司, 久保圭吾

    第48回複合材料シンポジウム  2023.09 

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  • 固有振動数と回転角を用いた鋼アーチ橋模型の損傷検知(シンポジウム講演概要)

    赤星花奈, 林厳, 陳瑜, 山口隆司

    第26回応用力学シンポジウム  2023.09 

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  • 両端に皿頭を有する高強度・高耐久ボルトセットを用いた摩擦接合継手のすべり挙動

    橋本達也, 森山仁志, 林厳, 山口隆司

    令和5年度土木学会年次学術講演会  2023.09 

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  • 両端に皿頭を有する高強度・高耐久ボルトセットの締付実験

    高山昌士, 森山仁志, 橋本達也, 山口隆司, 林厳, 吉見正頼

    令和5年度土木学会年次学術講演会  2023.09 

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  • モニタリング省力化のための鋼アーチ橋模型の吊材損傷検知に関する実験的検討

    赤星花奈, 林厳, 山口隆司

    令和5年度土木学会年次学術講演会  2023.09 

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  • Uリブ本数が2方向面内力を受ける補剛板の耐荷力に与える影響

    安田航輔, 山口隆司, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • S14Tを用いた摩擦接合継手における連結板の構造諸元がすべり耐力に与える影響

    小西美里, 山口隆司, 佐倉亮, 林厳

    令和5年度土木学会年次学術講演会  2023.09 

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  • 多径間ゲルバー鋼鈑桁橋における全橋および中間ヒンジ構造のFEモデリング(シンポジウム講演概要)

    平岡葵, 林厳, 山口隆司

    第26回応用力学シンポジウム  2023.05 

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  • 鋼箱桁橋腹板の曲げ座屈を再現するフランジ辺の境界条件に関する基礎的研究

    池田未来, 山口隆司, 新井進太郎, 林厳

    令和4年度土木学会年次学術講演会  2022.09 

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  • 母材を皿型加工した皿型高力ボルト1面摩擦接合継手の板厚構成がすべり耐力に及ぼす影響

    小西美里, 林厳, 山口隆司, 郎宇, 吉田賢二, 加藤大樹

    令和4年度土木学会年次学術講演会  2022.09 

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  • 桁端側腹板に欠損を有する鋼鈑桁の高力ボルト当て板補修の高さおよびボルト配置に関する解析的検討

    尾葉石海渡, 林厳, 山口隆司

    令和4年度土木学会年次学術講演会  2022.09 

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  • 断面観察による高力ボルト摩擦接合GFRP継手の表面塗装がすべり耐力に及ぼす影響評価

    関本将貴, 林厳, 山口隆司, 久保圭吾, 酒井圭一, 青木海

    令和4年度土木学会年次学術講演会  2022.09 

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  • 支圧板方式剛結構造における下フランジの埋め込み長が応力伝達機構に与える影響

    中岡健太, 木村聡, 利根川太郎, 山口隆司, 林厳

    令和4年度土木学会年次学術講演会  2022.09 

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  • 両側に皿頭を有する高耐久・高強度ボルトセット(ダブルスピンドルファスナー) の締付穴形状の提案

    橋本達也, 森山仁志, 林厳, 山口隆司

    令和4年度土木学会年次学術講演会  2022.09 

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  • SUS316L製ステンレス高力ボルトの首下R部とねじ部の応力集中に関する解析的検討

    小村政孝, 山口隆司, 林厳, 志村保美, 香月学

    令和4年度土木学会年次学術講演会  2022.09 

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  • GFRP材料の機械的性質に対する温度サイクル時間の影響

    岡井大樹, 橋本国太郎, 林厳

    令和4年度土木学会年次学術講演会  2022.09 

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  • GFRP摩擦接合における高力ボルトのリラクセーション特性

    青木海, 久保圭吾, 酒井圭一, 山口隆司, 林厳, 関本将貴

    令和4年度土木学会年次学術講演会  2022.09 

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  • BP-A支承の腐食損傷の程度が支承部の水平・回転変形追従機構およびその周辺部材の応力性状に及ぼす影響

    平岡葵, 林厳, 山口隆司, 新名裕

    令和4年度土木学会年次学術講演会  2022.09 

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  • 高力皿型トルシアボルトの締結・継手性能の実験

    小西美里, 林厳, 山口隆司, 吉見正頼

    令和4年度土木学会関西支部年次学術講演会  2022.05 

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  • 薄板GFRP を用いた高力ボルト摩擦接合継手のすべり挙動

    関本将貴, 林厳, 山口隆司, 久保圭吾, 酒井圭一, 青木海

    令和4年度土木学会関西支部年次学術講演会  2022.05 

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  • 桁端側腹板に欠損を有する鋼鈑桁の当て板補修に関する解析的検討

    尾葉石海渡, 林厳, 山口隆司

    令和4年度土木学会関西支部年次学術講演会  2022.05 

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  • 加工硬化によるステンレス高力ボルトの製法が弾性係数に与える影響

    小村政孝, 山口隆司, 林厳, 星本成律, 香月学

    令和4年度土木学会関西支部年次学術講演会  2022.05 

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  • 中間支点部における支圧板方式合成構造の力学的挙動と補強リブが応力伝達に与える影響

    中岡健太, 山口隆司, 利根川太郎, 木村聡,林厳

    令和4年度土木学会関西支部年次学術講演会  2022.05 

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  • The load sharing of rivet and HTB combines joint

    陳瑜, 山口隆司, 山内誉史, 上野慶太, 林厳

    令和3年度土木学会年次学術講演会  2021.09 

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  • 高力ボルトを用いた当て板補強の端部のボルト間隔と主桁補強効果に関する解析的検討

    石田健人, 山口隆司, 松本崇志, 林厳

    令和3年度土木学会年次学術講演会  2021.09 

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  • 長孔を有する高力ボルト摩擦接合継手のすべり係数低減のメカニズムに関する検討

    堀井いずみ, 山口隆司, 小西日出幸, 亀崎誠志, 浅野貴弘, 佐溝純一, 加藤大樹, 林厳

    令和3年度土木学会年次学術講演会  2021.09 

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  • 腐食したゲルバーヒンジ部の局部応答に関する基礎的検討

    平岡葵, 林厳, 山口隆司

    令和3年度土木学会年次学術講演会  2021.09 

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  • 皿型高力ボルト継手におけるボルト破断強度に関する解析的検討

    中本勇, 山口隆司, 林厳

    令和3年度土木学会年次学術講演会  2021.09 

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  • 溶融亜鉛めっき高力ボルトを用いたGFRP摩擦接合のリラクセーション特性

    酒井圭一, 林厳, 山口隆司, 久保圭吾

    令和3年度土木学会年次学術講演会  2021.09 

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  • 接着剤と高力ボルト摩擦接合の併用接合における見かけのすべり係数に関する解析的検討

    福辻菜絵, 神野巧矢, 山口隆司, 青木康素, 林厳

    令和3年度土木学会年次学術講演会  2021.09 

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  • 双皿型高耐久性高力ボルトセット(ダブルスピンドルファスナー)のナット形状に関する解析的検討

    橋本達也, 山口隆司, 林厳, 森山仁志

    令和3年度土木学会年次学術講演会  2021.09 

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  • ざぐり部の表面処理方法に着目した皿型高力ボルト摩擦接合継手のすべり試験

    林厳, 澤村良弘, 郎宇, 山口隆司, 熊野拓志, 吉田賢二, 田中伸尚

    令和3年度土木学会年次学術講演  2021.09 

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  • 高力ボルト間隔に着目した鋼I 桁腹板の当て板断面補強に関する研究

    石田健人, 山口隆司, 松本崇志, 林厳

    令和3年度土木学会関西支部年次学術講演会  2021.05 

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  • 長孔を有する高力ボルト摩擦接合継手のすべり挙動に関する解析的検討

    堀井いずみ, 山口隆司, 小西日出幸, 亀崎誠志, 林厳

    令和3年度土木学会関西支部年次学術講演会  2021.05 

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  • 無機ジンクリッチペイント面に接着剤を塗布した接合面のせん断強度と接合面圧の関係

    福辻菜絵, 神野巧矢, 山口隆司, 青木康素, 堀井久一, 林厳

    令和3年度土木学会関西支部年次学術講演会  2021.05 

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  • 水平補剛材を省略した鋼箱桁橋腹板の耐荷力に関する基礎的研究

    池田未来, 山口隆司, 新井進太郎, 林厳

    令和4年度土木学会関西支部年次学術講演会  2021.05 

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  • 橋梁応答モニタリングによる既設ゲルバー橋ヒンジ部の変状評価に関する基礎的研究

    平岡葵, 林厳, 山口隆司

    令和3年度土木学会関西支部年次学術講演会  2021.05 

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  • 双皿型高耐久性高力ボルトセット(ダブルスピンドルファスナー)に使用するねじ形状の検討

    橋本達也, 山口隆司, 林厳, 森山仁志

    令和3年度土木学会関西支部年次学術講演会  2021.05 

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  • 実PC橋の載荷実験に基づく耐荷性能と振動特性の推移に関する研究

    近藤洋佑, 林厳, 大島義信, 金哲佑

    令和元年度土木学会年次学術講演会  2020.09 

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  • 現地耐荷力実験に基づくPC橋の振動特性と構造性能評価

    近藤洋佑, 林厳, 大島義信, 金哲佑

    令和2年度土木学会年次学術講演会  2020.09 

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  • 有限要素モデルを用いた局所的な損傷による振動数変化に関する考察

    廣岡拓海, 林厳, 金哲佑

    令和2年度土木学会年次学術講演会  2020.09 

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  • 損傷劣化を模擬したPC箱桁の振動特性と耐荷特性の変化に関する実験的検討

    竹村光平, 近藤洋佑, 林厳, 金哲佑, 吉田英二

    令和2年度土木学会年次学術講演会  2020.09 

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  • PC箱桁におけるPC鋼材破断による振動特性と耐荷特性の変化に関する実験的検討

    竹村光平, 近藤洋佑, 林厳, 金哲佑, 吉田英二

    令和2年度土木学会関西支部年次学術講演会  2020.05 

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  • 局所的な損傷と境界条件の変化が鋼鈑桁橋の固有振動数に及ぼす影響

    廣岡拓海, 林厳, 金哲佑

    令和2年度土木学会関西支部年次学術講演会  2020.05 

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  • 加振を受ける薄肉鋼板の画像によるひずみ計測技術に関する研究

    川口祐一郎, Sakhiah Abdul Kudus, 林厳, 松村政秀, 杉浦邦征

    令和元年度土木学会関西支部年次学術講演会  2019.05 

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  • 鋼鈑桁橋における橋梁桁端の模擬き裂による振動数変化に関する力学的考察

    廣岡拓海, 三増拓也, 林厳, 五井良直, 金哲佑

    令和元年度土木学会関西支部年次学術講演会  2019.05 

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  • 補修板が接着されたGFRP積層板の被着剤の応力分布に着目した有限要素解析

    佐藤顕彦, 林厳, 松村政秀, 杉浦邦征

    第68期学術講演会  2019.05 

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  • 表面さび層を有する耐候性鋼材の機械的性質に関する検討

    吉村友輔, 松村政秀, 杉浦邦征, 林厳

    令和元年度土木学会関西支部年次学術講演会  2019.05 

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  • 現地載荷実験に基づくPC 橋の橋梁性能および振動モニタリング

    近藤洋佑, 林厳, 大島義信, 金哲佑

    第22回応用力学シンポジウム  2019.05 

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  • A statistical response of GFRP channel member performance considering material variability

    G. Hayashi, Y. Kitane, K. Sugiura, I. Nishizaki

    32nd KKHTCNN  2019 

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  • Vibration test and system identification of Gerber-type steel plate girder bridge

    Xin Zhou, Chul-Woo Kim, Yoshinao Goi, Gen Hayashi, Haru Hiraide

    32nd KKHTCNN  2019 

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  • Influence of Repair Plate Shape in GFRP Repairing

    A. Sato, G. Hayashi, Y. Kitane, M. Matsumura, K. Sugiura

    32nd KKHTCNN  2019 

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  • Changes in Modal Frequencies and Structural Behavior at Supports on a steel plate girder bridge Caused by Local Damage and Varying Temperature

    T. Hirooka, C.W. Kim, G. Hayashi, Y. Goi

    32nd KKHTCNN  2019 

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  • Feasibility investigation on damage detection of a real bridge by means of FE model updating

    Takuya Mimasu, Gen Hayashi, Chul Woo Kim

    11th Japanese-German Bridge Symposium  2018.09 

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  • 既設合成2主桁橋の現地振動計測とFEモデル構築

    林厳,金哲佑, 三増拓也, 五井良直, 吉田郁政, 杉浦邦征

    第21回応用力学シンポジウム  2018.05 

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  • 鋼板桁橋の損傷実験と振動モニタリング

    三増拓也, 金哲佑, 五井良直, 林厳

    第21回応用力学シンポジウム  2018.05 

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  • 部分的に破断したGFRPに対する補修板接着補修に関する研究

    佐藤顕彦, 鈴木康夫, 松村政秀, 杉浦邦征, 林厳

    平成30年度土木学会関西支部年次学術講演会  2018.05 

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  • Statistical evaluation on FRP members base on material testing

    Gen HAYASHI

    11th Taiwan-Japan Workshop on Structural and Bridge Engineering  2018.04 

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  • Investigation of changes in frequency of a steel plate girder bridge due to artificial damage

    Takuya Mimasu, Chul-Woo Kim, Yoshinao Goi, Gen Hayashi

    31st KKHTCNN  2018 

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  • Investigation on Transient Impact Response of Layered Structures

    Amr A. Nassr, Tomomi Yagi, Takashi Maruyama, Gen Hayashi

    平成28年度 京都大学防災研究所 研究発表講演会,京都大学宇治キャンパス  2017.02 

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  • Low Pass Filter Supported System Identification of a Long Span Steel Arch Bridge

    Takuya Mimasu, Chul Woo Kim, Gen Hayashi, Yoshinao Goi, San Yu Khaing

    The 8th International Conference on Science and Engineering(ICSE 2017)  2017 

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  • Statistical evaluation on tensile properties of GFRP members with channel cross section

    G. Hayashi, Y. Suzuki, M. Matsumura, K. Sugiura

    30th KKHTCNN  2017 

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  • 振動計測によるFRP歩道橋のFEモデルアップデート

    林厳, 金哲佑, 鈴木康夫, 杉浦邦征

    第19回応用力学シンポジウム  2016.05 

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  • 溝形断面を有するGFRP部材の引張特性に関する検討

    林厳, 鈴木康夫, 金哲佑, 杉浦邦征

    第65期学術講演会  2016.05 

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  • A study on tensile properties of GFRP channel members

    G. Hayashi, Y. Suzuki, M. Matsumura, K. Sugiura

    29th KKHTCNN  2016 

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  • 補強を有するFRP歩道橋の振動特性推定とFEモデルアップデート

    金哲佑, 林厳, 鈴木康夫, 橋本国太郎, 杉浦邦征, 日比英輝

    第18回応用力学シンポジウム  2015.05 

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  • Vibration measurements on an FRP pedestrian truss bridge and FE model updating

    G. Hayashi, C.W. Kim, Y. Suzuki, K. Sugiura, H. Hibi

    28th KKHTCNN  2015 

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Grant-in-Aid for Scientific Research

  • 超高耐久性メカニカルファスナーによる鋼構造物メンテナンスの改善

    Grant-in-Aid for Scientific Research(B)  2023

  • 構造システム挙動を考慮したFRP壁高欄における接合構造の合理化

    Grant-in-Aid for Early-Career Scientists  2023

  • 超高耐久性メカニカルファスナーによる鋼構造物メンテナンスの改善

    Grant-in-Aid for Scientific Research(B)  2022

  • 構造システム挙動を考慮したFRP壁高欄における接合構造の合理化

    Grant-in-Aid for Early-Career Scientists  2022

  • 構造システム挙動を考慮したFRP壁高欄における接合構造の合理化

    Grant-in-Aid for Early-Career Scientists  2021.04

Incentive donations / subsidies

  • 物性値ばらつきが高力ボルト摩擦接合FRP継手の継手性能に及ぼす影響

    一般財団法人 上田記念財団  2023

  • 橋梁ヘルスモニタリングの高度化のための橋梁特微量の提案

    公益財団法人 JFE21世紀財団  2022

  • 地震によるすべり損傷を有する高力ボルト摩擦接合連結部の残存保有耐力に関する基礎的研究

    公益財団法人 前田記念工学振興財団  2022

  • 腐食を有する鋼製支承の応答特性評価および機能不全が橋梁性能に及ぼす影響

    民間企業  2021.04

  • 複数損傷を有するアーチ橋の損傷検知に関する基礎的研究

    大学  2021.04

  • 振動ヘルスモニタリングを活用した既設ゲルバー橋の耐荷性および耐久性評価

    民間企業  2020.04

▼display all

Charge of on-campus class subject

  • 橋梁工学特別演習1

    2023   Weekly class   Graduate school

  • 測量学実習

    2023   Intensive lecture   Undergraduate

  • プログラミング演習

    2023   Weekly class   Undergraduate

  • 都市学入門

    2023   Weekly class   Undergraduate

  • 卒業研究

    2023   Intensive lecture   Undergraduate

  • 都市工学のための力学・数学基礎

    2023   Intensive lecture   Undergraduate

  • 都市工学のための科学基礎

    2023   Weekly class   Undergraduate

  • 構造力学Ⅲ

    2023   Intensive lecture   Undergraduate

  • 橋梁工学特別演習1

    2022   Weekly class   Graduate school

  • 都市学入門

    2022   Weekly class   Undergraduate

  • 測量学Ⅰ実習及び製図

    2022   Intensive lecture   Undergraduate

  • 都市工学のための力学・数学基礎

    2022   Intensive lecture   Undergraduate

  • 構造力学

    2022   Weekly class   Undergraduate

  • 前期特別研究(都市系)

    2022   Intensive lecture   Graduate school

  • プログラミング演習

    2022   Intensive lecture   Undergraduate

  • 測量学Ⅰ実習及び製図

    2021     Undergraduate

  • 構造力学Ⅲ

    2021   Weekly class   Undergraduate

  • 都市学入門

    2021   Weekly class   Undergraduate

  • 都市工学のための力学数学基礎

    2021   Weekly class   Undergraduate

  • 都市学入門

    2020   Weekly class   Undergraduate

  • 構造力学Ⅲ

    2020   Weekly class   Undergraduate

  • 都市工学のための力学数学基礎

    2020   Weekly class   Undergraduate

▼display all

Charge of off-campus class subject

  • 都市工学のための科学基礎

    2022.04
    -
    Now

  • プログラミング演習

    2021.10
    -
    Now

  • 測量学Ⅰ実習及び製図

    2021.04
    -
    Now

  • 構造力学III

    2020.10
    -
    Now

  • 鋼構造設計論

    2020.10
    -
    Now

  • 都市工学のための力学数学基礎

    2020.04
    -
    Now

▼display all

Original item・Special report (Education Activity)

  • 2021

      More details

    Original item:1回生の相談委員

Academic Activities

  • 座長:第15回複合・合成構造の活用に関するシンポジウム-部材挙動4 -

    Role(s): Panel moderator, session chair, etc.

    2023.11

  • 13th German‐Japanese Bridge Symposium

    Role(s): Planning, management, etc.

    German‐Japanese Bridge Symposium Organising Committee  2023.08

  • German-Japanese Workshop on Research Frontiers in Structural Engineering

    Role(s): Planning, management, etc.

    German-Japanese Workshop Organising Committee  2022.08

     More details

    Type:Competition, symposium, etc. 

International exchange activities

  • さくら招へいプログラム「我が国の道路構造物のメンテナンス・モニタリング・DX技術の国際展開に向けた技術研修」

    Field category :Research

    Country name :スロバキア   2024.01

  • 13th German‐Japanese Bridge Symposium -secretary-

    Field category :Research

    Country name :ドイツ・オーストリア   2023.08 - 2023.09

  • German-Japanese Workshop on Research Frontiers in Structural Engineering -Secretary-

    Country name :ドイツ   2022.08