直接基于位移的非规则减隔震桥梁抗震设计  

Aseismic design of irregular seismic reduction and isolation bridge directly based on displacement

作　　者：武少威 项敬辉 李建中[1] 陈旭 WU Shaowei;XIANG Jinghui;LI Jianzhong;CHEN Xu(State Key Laboratory of Disaster Prevention for Civil Engineering,Tongji University,Shanghai 200092,China;Tianjin Municipal Engineering Design&Research Institute,Tianjin 300392,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]天津市政工程设计研究总院有限公司,天津300392

出　　处：《振动与冲击》2024年第3期128-135,共8页Journal of Vibration and Shock

基　　金：天津市交通运输科技发展计划项目(2021-01)。

摘　　要：根据性能抗震设计的思想,提出一种高低墩减隔震桥梁直接基于位移的抗震设计方法,该方法可设计各桥墩配筋率及支座参数,使纵桥向地震作用下各墩保持弹性、各支座达到相同的损伤状态,并实现地震剪力或墩底弯矩的均匀分配。以某工程背景桥梁为例进行直接基于位移的设计,并建立有限元模型进行非线性时程分析,比较两者结果,验证所提方法的有效性。此外,对比了剪力均匀和墩底弯矩均匀这两种地震力分配方式下桥梁的地震响应。对于各墩采用相同截面尺寸和配筋的减隔震桥梁,当按照该方法进行设计时,推荐采用墩底弯矩均匀的地震力分配方式,该分配方式能更好的发挥材料性能、节约工程造价,但同时应保证墩高较低的桥墩有足够的抗剪能力。A direct displacement-based design procedure for isolated bridges with irregularity in height is proposed,which can be incorporated into a performance-based design philosophy.This method can be used to determine the reinforcement ratios of piers and the properties of bearings.Under longitudinal seismic motions,all piers can perform elastically,and all bearings can achieve the same damage state.Furthermore,a uniform distribution of shear forces or base bending moments among all piers can be achieved.An example bridge is designed using this method,and the finite element model of the bridge is established to perform nonlinear time history analysis.The comparison of design results and time history analysis results shows the effectiveness of this method.In addition,the seismic response of the bridge designed by this method under two seismic force distribution modes(i.e.,uniform shear force and uniform base bending moment)is compared.The result shows that for the bridge with the same section size and reinforcement at each pier,the uniform distribution of base bending moment is recommended.This distribution mode can optimize the use of materials and reduce construction costs,but special attention should be paid to the shear capacity check of short piers.

关 键 词：桥梁工程 非规则桥梁 减隔震桥梁 基于位移的设计 基于性能的设计 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]