基于时程响应分析的区域梁式桥震后状态快速评估  

Rapid post-earthquake state assessment of regional girder bridges based on time history response analysis

作　　者：杨纪鹏 钱骥[1,2] 夏烨 闫业祥 孙利民[3,4] Yang Jipeng;Qian Ji;Xia Ye;Yan Yexiang;Sun Limin(College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Lab of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [3]同济大学土木工程学院,上海200092 [4]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《土木工程学报》2023年第12期98-109,共12页China Civil Engineering Journal

基　　金：国家重点研发计划(2017YFC1500605)。

摘　　要：桥梁作为交通网络的枢纽,震后快速判定其损伤状态对于抢险救灾具有重要意义,传统基于易损性的方法仅能给出结构在不同地震强度指标下的破坏概率,给灾后抢险救援路线的选择带来一定困惑。本中研究提出基于非线性动力时程响应分析的区域桥梁群地震灾害模拟技术,首先将地表加速度响应反演得到基岩加速度响应,再根据地质钻孔数据计算得到区域地震动云图;其次,提出梁式桥的简化力学模型,实现区域梁桥的标准化数据输入与快速计算;最后,基于时程分析结果判定构件损伤状态,使用串联体系方法得到桥梁整体损伤状态。以某一地区85座桥梁为例,根据E2地震反应谱选取地震波进行区域桥梁地震灾害模拟,结果表明所提方法计算效率高,同时能够考虑结构的设计参数、场地特性、余震对结构的影响,可定量评估结构损伤状态,计算结果能够为灾后救援提供有力的技术支撑。Because the bridge is the hub of transportation network,it is of great significance for emergency rescue and disaster relief to quickly determine the damage state of post-earthquake bridges.The traditional vulnerability-based method can only give the failure probability of the structure under different earthquake intensity indicators,leading to some confusion on the selection of rescue route after disaster.Based on the nonlinear dynamic time history response analysis,an earthquake disaster simulation technology of regional bridge group is proposed.Firstly,the bedrock acceleration response is obtained by inverting the surface acceleration response,and then the regional seismic contour is calculated according to the geological borehole data.Secondly,a simplified mechanical model of the girder bridge is proposed to achieve the standardized data input and fast calculation of regional girder bridge.Finally,based on the results of time history analysis,the damage states of components are determined,and the series system method is used to obtain the overall damage state of the bridge.With 85 bridges in an area taken as the examples,seismic waves are selected according to the E2 seismic response spectrum to simulate the seismic disaster of regional bridges.The results show that the proposed method has high computational efficiency,and can consider the impact of the structural design parameters,site characteristics,and aftershocks on the structure,and can quantitatively evaluate the damage state of the structure.The calculation results may provide sufficient technical support for post-disaster rescue.

关 键 词：地震灾害 区域桥梁群 非线性时程分析 状态评估 

分 类 号：P315.9[天文地球—地震学]