考虑桩径效应的桥梁结构地震风险分析  

Seismic risk analysis of bridge structure considering pile diameter effect

作　　者：万华平 卫志成 苏雷 任伟新 WAN Huaping;WEI Zhicheng;SU Lei;REN Weixin(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]合肥工业大学土木与水利工程学院,合肥230009 [3]青岛理工大学土木工程学院,山东青岛266033 [4]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《振动与冲击》2021年第15期224-231,共8页Journal of Vibration and Shock

基　　金：国家重点研发项目(2019YFB2102702);国家自然科学基金(51878235,51808307,51778204)。

摘　　要：桩-土-结构相互作用是桥梁结构地震反应分析的重要问题,其中桩径效应不应忽略。以一座三跨连续梁桥为例,研究桩径效应对桥梁地震风险的影响。具体建立三种有限元模型:模型一是同时考虑桩-土-结构相互作用和桩径效应;模型二是考虑桩-土-结构相互作用,但没有考虑桩径效应;模型三是墩底固结的简化模型。通过增量动力分析方法计算桥梁结构的地震易损性曲线和地震风险曲线,对三种模型的计算结果进行对比分析。结果表明,同时考虑桩-土-结构相互作用和桩径效应的模型对应地震易损性与地震风险最高;墩底固结的模型对应地震易损性和地震风险最低。Pile-soil-structure interaction is an important problem in seismic response analysis of bridge structures,where pile diameter effect should not be ignored.Here,taking a three-span continuous beam bridge as an example,effects of pile diameter effect on bridge seismic risk was studied.Three kinds of finite element models of model1 simultaneously considering pile-soil-structure interaction and pile diameter effect,model2 considering pile-soil-structure interaction but not pile diameter effect and model 3 being a simplified model of pier bottom fixed were established.The seismic vulnerability curve and seismic risk curve of the bridge structure were calculated with the incremental dynamic analysis method.The contrastive analysis was performed for the calculation results of the three models.The results showed that model1 simultaneously considering pile-soil-structure interaction and pile diameter effect has the highest seismic vulnerability and seismic risk;model 3 with pier bottom fixed has the lowest seismic vulnerability and seismic risk.

关 键 词：地震风险分析 地震易损性 梁桥结构 桩径效应 增量动力分析 

分 类 号：TU312.1[建筑科学—结构工程] U447[建筑科学—桥梁与隧道工程]