Exceeding probability analysis for rail of high-speed railway under seismic excitations

作     者：Hongping Xing Yu Liu Xiaodan Sun 

作者机构：School of civil engineeringSouthwest Jiaotong UniversityChengduChina Key Laboratory of High-speed Railway Engineering of Ministry of EducationSouthwest Jiaotong UniversityChengduChina National Engineering Research Center for Geological Disaster Prevention Technology in Land TransportationSouthwest Jiaotong UniversityChengduChina 

出 版 物：《Railway Sciences》 (铁道科学（英文）)

年 卷 期：2023年第2卷第4期

页      面：413-430页

学科分类：08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：supported by National Key Research and Development Plan of China“Basic Theory and Methods for Resilience Assessment and Risk Control of Transportation Infrastructures”(2021YFB2600500) the National Nature Science Foundation of Si Chuan(2023NSFSC0388) the Joint Research Fund for Earthquake Science launched by the National Natural Science Foundation of China and China Earthquake Administration(U2039208) 

主　　题：Workflow Incremental dynamic analysis Dynamic displacement response The smoothness of the rail Exceeding probability Risk level 

摘      要：Purpose–The smoothness of the high-speed railway(HSR)on the bridge may exceed the allowable standard when an earthquake causes vibrations for HSR bridges,which may threaten the safety of running ***,few studies have evaluated the exceeding probability of rail displacement exceeding the allowable *** purposes of this article are to provide a method for investigating the exceeding probability of the rail displacement of HSRs under seismic excitation and to calculate the exceeding ***/methodology/approach–In order to investigate the exceeding probability of the rail displacement under different seismic excitations,the workflow of analyzing the smoothness of the rail based on incremental dynamic analysis(IDA)is proposed,and the intensity measure and limit state for the exceeding probability analysis of HSRs are *** a finite element model(FEM)of an assumed HSR track-bridge system is constructed,which comprises a five-span simply-supported girder bridge supporting a finite length CRTS II ballastless *** different seismic excitations,the seismic displacement response of the rail is calculated;the character of the rail displacement is analyzed;and the exceeding probability of the rail vertical displacement exceeding the allowable standard(2mm)is ***–The results show that:(1)The bridge-abutment joint position may form a step-like under seismic excitation,threatening the running safety of high-speed trains under seismic excitations,and the rail displacements at mid-span positions are bigger than that at other positions on the bridge.(2)The exceeding probability of rail displacement is up to about 44%when PGA 50.01g,which is the level-five risk probability and can be described as’very likely to happen’.(3)The exceeding probability of the rail at the mid-span positions is bigger than that above other positions of the bridge,and the mid-span positions of the track-bridge system above the bridge may be the most