设置摇摆-自复位桥墩和黏滞阻尼器的斜拉桥纵向减震性能  

Longitudinal seismic performance of cable-stayed bridges with rocking self-centering piers and viscous dampers

作　　者：王德斌 郭宇晨 孙治国[2] WANG Debin;GUO Yuchen;SUN Zhiguo(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China;Key Laboratory of Building Failure Mechanism and Disaster Prevention,China Earthquake Administration,Institute of Disaster Prevention,Beijing 101601,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116028 [2]防灾科技学院中国地震局建筑物破坏机理与防御重点实验室,北京101601

出　　处：《哈尔滨工程大学学报》2023年第8期1336-1344,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51978167);大连市青年科技之星项目(2018RQ72).

摘　　要：为发展具有自复位功能的斜拉桥减震体系,降低其纵向地震响应,提高震后可恢复能力,本文提出了由黏滞阻尼器与自复位桥墩组合成的新型斜拉桥体系。基于OpenSees有限元分析平台,建立了3种不同设计方案下的斜拉桥有限元分析模型,并选取5组近场地震动对各模型进行非线性动力时程分析,对比了各模型斜拉桥的地震反应。结果表明:黏滞阻尼器的存在虽然能够显著提高斜拉桥体系纵向抗震能力,但同时增加了桥墩墩顶的纵向残余位移,不利于桥墩震后修复。摇摆-自复位桥墩可有效改善这一状况,通过增大墩梁相对位移,将地震输入的能量集中于阻尼器,增强了阻尼器的耗能能力并通过摇摆墩的自复位能力有效降低了桥墩的纵向残余位移,有利于实现斜拉桥的震后快速恢复,满足既定的抗震设计目标。A novel type of seismic self-centering cable-stayed bridge system was developed using viscous dampers and rocking self-centering(RSC)auxiliary piers to reduce the longitudinal seismic response and improve the resilience of cable-stayed bridges during severe earthquakes.Three types of finite element models of cable-stayed bridges were built using the OpenSees platform.In addition,nonlinear dynamic time-historical analysis was performed by imparting five groups of near-field ground motions,and the responses of the bridge models were compared.The results showed that although the utilization of viscous dampers considerably improved the longitudinal seismic capacity of the cable-stayed bridges,it also increased the longitudinal residual displacement of the pier tops,which is not conducive to post-earthquake repair of the piers.Notably,RSC piers can effectively address this issue.By increasing the distance between the piers and beams,the seismic input energy is concentrated on the damper.This enhances the energy dissipation capacity of the damper and effectively reduces the longitudinal residual displacement of the piers due to their self-centering capability.This approach facilitates the rapid recovery of cable-stayed bridges after an earthquake and fulfills the established seismic design goals.

关 键 词：斜拉桥 减震 摇摆墩 自复位 黏滞阻尼器 耗能 残余位移 震后修复 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]