Analysis of critical directions of earthquake input of high-speed railway continuous girder bridges based on fragility analysis method

被引：0
|
作者：
Shen H. [1 ]
Wang H. [1 ]
Zheng W. [1 ]
Liang R. [1 ]
Sha B. [1 ]
机构：
[1] Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education, Southeast University, Nanjing
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2019年 / 49卷 / 05期
关键词：
Damage state; Direction of earthquake input; Fragility analysis method; High-speed railway bridge; Relative displacement ductility ratio;
D O I：
10.3969/j.issn.1001-0505.2019.05.016
中图分类号：
学科分类号：
摘要：
To determine the critical directions of earthquake input of high-speed railway continuous girder bridges, the nonlinear dynamic analysis model of a typical three-span high-speed railway continuous girder bridge was established based on OpenSees. Taking the relative displacement ductility ratio (RDDR) as the damage index of the piers, the limit values of RDDR of the middle piers and the side piers at different damage states (DSs) in different section directions were analyzed. Then, the fragility curves of the piers with respect to section directions under different directions of earthquake input were obtained. Finally, the median value of the fragility function was selected as the index to determine the critical directions of the earthquake input and the corresponding section directions. The critical directions of the earthquake input can be determined by comparing the median value of the fragility function in the critical section directions at different directions of the earthquake input. The results show that the phase difference of the critical section directions of each pier under the same directions of the earthquake input is less than 20°. The critical directions of the earthquake input and the corresponding section directions for all DSs of the side piers are 90°, and the critical directions of the earthquake input for each DS of the fixed middle pier are different. When the direction of the earthquake input is in the range of 0° to 50°, the probability of damage at all levels of the side piers is higher; however, when the direction is in the range of 60° to 90°, that of the side piers is higher. © 2019, Editorial Department of Journal of Southeast University. All right reserved.
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页码：926 / 932
页数：6
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