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- 검색키워드
- 저자 : Toshiro Hayashikawa (검색결과 5 건)
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Liangming Sun,Toshiro Hayashikawa,Xingwen He,Weiping Xie 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
This study is intended to clarify the parametric influence for the vibration responses of rigid-frame viaducts in both vertical and lateral directions caused by running high-speed trains. A developed 3D numerical analysis approach considering trainbridge interaction is applied to investigate the vibration characteristics of rigid-frame viaducts. The analytical model is composed of the high-speed train model with multi-DOFs vibration system for each car and the rigid-frame viaduct model with three bridge blocks. They are linked by an assumed wheel-rail relation through the rail model considering the simulated track irregularities. By using the analytical model, the parametric study is carried out. The impact factors including train speed, train type, track irregularity, rail type and damping are investigated and identified as significant variables. The analytical results are significant and give some instructive information regarding the impact factors of the train-bridge system which could be much helpful for the mitigation of vibration and the maintenance in the high-speed railway.
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Md. Robiul Awall,Toshiro Hayashikawa,Xingwen He,Takashi Matsumoto 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.2
The torsional stiffness of curved twin I-girder bridges is very low, which may lead to a vulnerability to eccentric dynamic loads. This study is intended to investigate the improvement effect of bottom lateral bracings on dynamic performance of curved twin I-girder bridges under running vehicles, using a developed numerical approach. In this approach, to conduct the running vehicle-bridge interaction analysis, finite element method is used to create the detailed models of both the curved bridge and the running vehicle. Parametric studies are carried out using these numerical models to investigate the effect of bottom lateral bracings on the dynamic performance of the curved bridge under running vehicles. The numerical results indicate that the proposed bottom lateral bracing systems can increase the torsional stiffness of the bridge, whose increasing rate depends on the type of bracing configuration. The bottom lateral bracings can also distribute dynamic loads smoothly between the two main girders, which leads to a more stable structure.
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He, Xingwen,Kawatani, Mitsuo,Hayashikawa, Toshiro,Kim, Chul-Woo,Catbas, F. Necati,Furuta, Hitoshi Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.5
In this study, a damage detection approach using train-induced vibration response of the bridge is proposed, utilizing only direct structural analysis by means of introducing soft computing methods. In this approach, the possible damage patterns of the bridge are assumed according to theoretical and empirical considerations at first. Then, the running train-induced dynamic response of the bridge under a certain damage pattern is calculated employing a developed train-bridge interaction analysis program. When the calculated result is most identical to the recorded response, this damage pattern will be the solution. However, owing to the huge number of possible damage patterns, it is extremely time-consuming to calculate the bridge responses of all the cases and thus difficult to identify the exact solution quickly. Therefore, the soft computing methods are introduced to quickly solve the problem in this approach. The basic concept and process of the proposed approach are presented in this paper, and its feasibility is numerically investigated using two different train models and a simple girder bridge model.
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Xingwen He,Mitsuo Kawatani,Toshiro Hayashikawa,Chul-Woo Kim,F. Necati Catbas,Hitoshi Furuta 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.5
In this study, a damage detection approach using train-induced vibration response of the bridge is proposed, utilizing only direct structural analysis by means of introducing soft computing methods. In this approach, the possible damage patterns of the bridge are assumed according to theoretical and empirical considerations at first. Then, the running train-induced dynamic response of the bridge under a certain damage pattern is calculated employing a developed train-bridge interaction analysis program. When the calculated result is most identical to the recorded response, this damage pattern will be the solution. However, owing to the huge number of possible damage patterns, it is extremely time-consuming to calculate the bridge responses of all the cases and thus difficult to identify the exact solution quickly. Therefore, the soft computing methods are introduced to quickly solve the problem in this approach. The basic concept and process of the proposed approach are presented in this paper, and its feasibility is numerically investigated using two different train models and a simple girder bridge model.
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Characteristic analysis on train-induced vibration responses of rigid-frame RC viaducts
Liangming Sun,Weiping Xie,Xingwen He,Toshiro Hayashikawa 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.5
A three-dimensional (3D) numerical analysis for the train-bridge interaction (TBI) system is actively developed in this study in order to investigate the vibration characteristics of rigid-frame reinforced concrete (RC) viaducts in both vertical and lateral directions respectively induced by running high-speed trains. An analytical model of the TBI system is established, in which the high-speed train is described by multi-DOFs vibration system and the rigid-frame RC viaduct is modeled with 3D beam elements. The simulated track irregularities are taken as system excitations. The numerical analytical algorithm is established based on the coupled vibration equations of the TBI system and verified through the detailed comparative study between the computation and testing. The vibration responses of the viaducts such as accelerations, displacements, reaction forces of pier bottoms as well as their amplitudes with train speeds are calculated in detail for both vertical and lateral directions, respectively. The frequency characteristics are further clarified through Fourier spectral analysis and 1/3 octave band spectral analysis. This study is intended to provide not only a simulation approach and evaluation tool for the train-induced vibrations upon the rigid-frame RC viaducts, but also instructive information on the vibration mitigation of the high-speed railway.
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