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Structural Engineering and Mechanics Volume 81, Number 2, January25 2022 , pages 219-230 DOI: https://doi.org/10.12989/sem.2022.81.2.219 |
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Evaluation of optimal ground motion intensity measures of high-speed railway train running safety on bridges during earthquakes |
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Xiang Liu, Lizhong Jiang, Ping Xiang, Yulin Feng, Zhipeng Lai and Xiaoyun Sun
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| Abstract | ||
| Due to the large number of railway bridges along China's high-speed railway (HSR) lines, which cover a wide area with many lines crossing the seismic zone, the possibility of a HSR train running over a bridge when an earthquake occurs is relatively high. Since the safety performance of the train will be threatened, it is necessary to study the safety of trains running over HSR bridges during earthquakes. However, ground motion (GM) is highly random and selecting the appropriate groundmotion intensity measures (IMs) for train running safety analysis is not trivial. To deal this problem, a model of a coupled trainbridge system under seismic excitation was established and 104 GM samples were selected to evaluate the correlation between 16 different IMs and train running safety over HSR bridges during earthquakes. The results show that spectral velocity (SvT1) and displacement (SdT1) at the fundamental period of the structure have good correlation with train running safety for mediumand long-period HSR bridges, and velocity spectrum intensity (VSI) and Housner intensity (HI) have good correlation for a wide range of structural periods. Overall, VSI and HI are the optimal IMs for safety analysis of trains running over HSR bridges during earthquakes. Finally, based on VSI and HI, the IM thresholds of an HSR bridge at different speed were analyzed. | ||
| Key Words | ||
| earthquake; ground motion; intensity measure; railway bridge; running safety | ||
| Address | ||
| Xiang Liu: School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China Lizhong Jiang: School of Civil Engineering, Central South University, Changsha 410075, China Ping Xiang: School of Civil Engineering, Central South University, Changsha 410075, China Yulin Feng: School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China Zhipeng Lai: School of Civil Engineering, Central South University, Changsha 410075, China Xiaoyun Sun: Nanjing Vocational Institute of Transport Technology, Nanjing 211188, China | ||