Field survey and analysis on near-fault severely damaged high-speed railway bridge in 2022 M6.9 Menyuan earthquake  

作　　者：Lin Xuchuan Liu Fuxiang Shan Wenchen 

机构地区：[1]Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China [2]Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China [3]Institute of Smart City and Intelligent Transportation,Southwest Jiaotong University,Chengdu,610000,China

出　　处：《Earthquake Engineering and Engineering Vibration》2024年第4期1043-1055,共13页地震工程与工程振动（英文刊）

基　　金：Scientific Research Funding of IEM under Grant No.2021EEEVL0211;Natural Science Foundation of Heilongjiang Province under Grant No.JQ2021E006;National Natural Science Foundation of China under Grant No.52208185。

摘　　要：The 2022 M6.9 Menyuan earthquake caused severe damage to a high-speed railway bridge,which was designed for high-speed trains running at speeds of above 250 km/h and is located right next to the fault.Bridges of this type have been widely used for rapidly constructing the high-speed railway network,but few bridges have been tested by near-fault devastating earthquakes.The potential severe impact of the earthquake on the high-speed railway is not only the safety of the infrastructure,trains and passengers,but also economic loss due to interrupted railway use.Therefore,a field survey was carried out immediately after the earthquake to collect time-sensitive data.The damage to the bridge was carefully investigated,and quantitative analyses were conducted to better understand the mechanism of the bridge failure.It was found that seismic action perpendicular to the bridge’s longitudinal direction caused severe damage to the girders and rails,while none of the piers showed obvious deformation or cracking.The maximum values of transverse displacement,out-of-plane rotation and twisting angle of girders reached 212.6 cm,3.1 degrees and 19.9 degrees,respectively,causing severe damage to the bearing supports and anti-seismic retaining blocks.These observations provide a basis for improving the seismic design of high-speed railway bridges located in near-fault areas.

关 键 词：Menyuan earthquake field survey high-speed railway bridge near fault seismic damage 

分 类 号：U447[建筑科学—桥梁与隧道工程]