防灾减灾工程学报2025，Vol.45Issue(4)：697-711,15.DOI:10.13409/j.cnki.jdpme.20250412002
地震诱发滚石链生灾害下桥梁失效路径及动力响应特性研究
Study on Failure Paths and Dynamic Response Characteristics of Bridges under Earthquake-induced Rockfall Cascading Disasters
摘要
Abstract
Mountain bridges may be threatened by earthquake-induced rockfall cascading disasters.However,the failure paths and dynamic response patterns remain unclear.This study proposed a high-precision numerical analysis method for bridge damage under earthquake-induced rockfall cascading di-sasters.A multi-hazard dynamic finite element model for typical girder bridges was established,and the accuracy of the numerical method was validated based on existing experimental data.On this ba-sis,the effects of different ground motion characteristics,rockfall parameters,and impact locations on the failure paths and dynamic characteristics of bridges under earthquake-induced rockfall cascading di-sasters were systematically investigated.The analytical results showed that under the influence of pre-sequence earthquakes,bridge bearings and restrainers sustained early damage,while most bridge piers exhibited mild to moderate damage.However,under the subsequent rockfall cascading disaster,the bridge piers suffered severe damage leading to failure,with shear failure being the dominant ulti-mate failure mode.Compared to rockfall-only scenarios,the dynamic responses of the bridge under earthquake-induced rockfall cascading disasters significantly increased.For instance,after the Chalfant Valley earthquake,the pier base bending moment and shear force increased by 34%and 41%,respec-tively,while the maximum bending moment and shear force of the pile foundations increased by 80%and 98%,respectively.Additionally,different rockfall parameters significantly affected the dynamic responses of the bridge.For instance,when the rockfall velocity increased from 5 m/s to 30 m/s,the maximum bending moment and shear force of piers increased by 96%and 94%,respectively.Similar-ly,increasing rock diameter from 1.0 m to 1.8 m led to 23%and 22%increases in the maximum bend-ing moment and shear force of piers.关键词
地震诱发滚石链生灾害/山区桥梁/数值模拟/失效路径/动力响应Key words
earthquake-induced rockfall cascading disasters/mountain bridges/numerical simulation/failure paths/dynamic response分类
建筑与水利引用本文复制引用
陈宇轩,温佳年,宋彦臣,韩强,杜修力..地震诱发滚石链生灾害下桥梁失效路径及动力响应特性研究[J].防灾减灾工程学报,2025,45(4):697-711,15.基金项目
国家重点研发计划青年科学家项目(2022YFB2602500)资助 （2022YFB2602500）
