主余震作用下摇摆-自复位桥墩抗震性能分析  

Seismic performance analysis of the rocking self-centering bridge piers under the action of mainshock-aftershock

作　　者：郝冀民 卜建清 郭至博 郭少聪 HAO Jimin;BU Jianqing;GUO Zhibo;GUO Shaocong(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043

出　　处：《世界地震工程》2025年第1期197-208,共12页World Earthquake Engineering

基　　金：国家重点研发计划项目(2021YFB2600605,2021YFB2600600);河北省省级科技计划项目(23567602H)。

摘　　要：为探究摇摆-自复位(rocking self-centering,RSC)桥墩在主余震作用下的抗震性能,基于OpenSees建立RSC桥墩与普通现浇钢筋混凝土桥墩抗震数值分析模型,对比分析了两种桥墩分别在主震和主余震作用下的墩底弯矩-曲率、最大墩顶位移和残余位移,并采用增量动力分析法和Park-Ang损伤指标评估了其损伤状态。结果表明:在0.6 g主余震作用下,RSC桥墩的墩底截面最大曲率为普通现浇钢筋混凝土桥墩的2.84%~10.04%,墩底截面最大弯矩随着耗能钢筋配筋率的增大而减小;当地震强度为0.4~0.6 g时,余震会使RSC桥墩的最大墩顶位移增大1.65%~8.36%;余震对RSC桥墩残余位移的影响不明显;在主震过后处于中等损伤或严重损伤的RSC桥墩,需要考虑余震对其的附加损伤,当地震强度大于0.5 g时,余震对RSC桥墩的损伤增量会随着耗能钢筋配筋率增大而增大。To investigate the seismic performance of rocking self-centering(RSC)bridge piers under mainshock-aftershock sequences,numerical models of RSC and conventional cast-in-place reinforced concrete bridge piers were developed using OpenSees.The models were used to compare the moment-curvature at the pier base,maximum pier top displacement,and residual displacement under both mainshock and combined mainshock-aftershock conditions.Incremental dynamic analysis and the Park-Ang damage index were employed to assess the damage states.The results indicate the following:Under a 0.6 g mainshock-aftershock,the maximum curvature at the pier base section of an RSC bridge pier is 2.84%to 10.04%of that of a conventional cast-in-place reinforced concrete pier,with the maximum moment decreasing as the energy-dissipating reinforcement ratio increases.When the earthquake intensity ranges from 0.4 g to 0.6 g,aftershocks increase the maximum pier top displacement of the RSC bridge piers by 1.65%to 8.36%.The impact of aftershocks on the residual displacement of RSC bridge piers is negligible.For RSC bridge piers that have sustained moderate to severe damage from the mainshock,additional damage from aftershocks must be considered.When the earthquake intensity exceeds 0.5 g,the damage increment in RSC bridge piers increases with the reinforcement ratio of energy-dissipating bars.

关 键 词：桥墩抗震 摇摆-自复位桥墩 主余震 耗能钢筋配筋率 损伤指标 

分 类 号：TU352.11[建筑科学—结构工程]