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Structural Engineering and Mechanics Volume 69, Number 2, January10 2019 , pages 177-191 DOI: https://doi.org/10.12989/sem.2019.69.2.177 |
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The effect of local topography on the seismic response of a coupled train-bridge system |
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Hong Qiao, Xianting Du, He Xia, Guido De Roeck, Geert Lombaert and Peiheng Long
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| Abstract | ||
| The local topography has a significant effect on the characteristics of seismic ground motion. This paper investigates the influence of topographic effects on the seismic response of a train-bridge system. A 3-D finite element model with local absorbing boundary conditions is established for the local site. The time histories of seismic ground motion are converted into equivalent loads on the artificial boundary, to obtain the seismic input at the bridge supports. The analysis of the train-bridge system subjected to multi-support seismic excitations is performed, by applying the displacement time histories of the seismic ground motion to the bridge supports. In a case study considering a bridge with a span of 466 m crossing a valley, the seismic response of the train-bridge system is analyzed. The results show that the local topography and the incident angle of seismic waves have a significant effect on the seismic response of the train-bridge system. Leaving these effects out of consideration may lead to unsafe analysis results. | ||
| Key Words | ||
| train-bridge system; seismic analysis; topographic effect; viscous-spring artificial boundary; incident angle; azimuth | ||
| Address | ||
| Hong Qiao: 1) School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, 15 Yongyuan Rd, Beijing 102616, China 2) School of Civil Engineering, Beijing Jiaotong University, Shangyuancun No.3, Beijing 100044, China 3) Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40, Leuven B-3001, Belgium Xianting Du and He Xia: School of Civil Engineering, Beijing Jiaotong University, Shangyuancun No.3, Beijing 100044, China Guido De Roeck and Geert Lombaert: Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40, Leuven B-3001, Belgium Peiheng Long: School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, 15 Yongyuan Rd, Beijing 102616, China | ||