摘要
在大震或特大震下,黏滞阻尼器可能因某个极限状态的出现而发生破坏。现有在斜拉桥上设置黏滞阻尼器的研究多集中在阻尼器的参数优化上,很少考虑到阻尼器失效对斜拉桥抗震性能的影响。针对这一问题,以某三塔斜拉桥为背景,利用OpenSees平台建立斜拉桥有限元模型和可以考虑承载力及行程极限的黏滞阻尼器模型;分析黏滞阻尼器的阻尼系数和阻尼指数对斜拉桥地震响应的影响,确定阻尼器参数的取值;对不安装阻尼器、安装不考虑极限状态及考虑极限状态阻尼器等多种工况的斜拉桥进行非线性时程分析,对比各工况斜拉桥的地震响应。分析结果表明,在大震下,考虑极限状态阻尼器的耗能能力及减震效果将显著降低;不考虑阻尼器达到极限状态后失效的情况将高估耗能减震设计斜拉桥的抗震能力。
Viscous dampers can be destroyed due to a certain limit state during large earthquakes.However,existing research on viscous dampers for cable-stayed bridges has mostly focused on the parameter optimization of dampers,and only a few studies have considered the impact of damper failure on the seismic performance of cable-stayed bridges.In this paper,a finite element model of a three-tower cable-stayed bridge and a simplified model of viscous dampers were established based on the OpenSees platform,taking into account the bearing capacity and travel limit.The influence of the damping coefficient and the damping index of the viscous damper on the seismic response of the cable-stayed bridge was studied,and the values of the damper parameters were determined.Nonlinear time-history analysis of the cable-stayed bridge was conducted,and the seismic responses were compared for the following conditions:without dampers,with dampers but not considering the limit state,and with dampers and considering the limit state.Results show that the energy dissipation capacity and the damping effect of the damper would be significantly decreased by considering their limit states during large earthquakes.The seismic capacity of cable-stayed bridges with energy dissipation design will be overestimated if the failure of dampers as a result of reaching their limit states is not taken into consideration.
作者
陈晨
刘金龙
林均岐
CHEN Chen;LIU Jinlong;LIN Junqi(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,CEA,Harbin 150080,Heilongjiang,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,Heilongjiang,China)
出处
《地震工程学报》
CSCD
北大核心
2023年第5期1222-1230,1240,共10页
China Earthquake Engineering Journal
基金
黑龙江省自然科学基金联合引导项目(LH2021E123)。
关键词
斜拉桥
黏滞阻尼器
阻尼器参数
阻尼器失效
地震响应
cable-stayed bridge
viscous damper
damper parameters
damper failure
seismic response
作者简介
第一作者:陈晨(1997-),男,硕士研究生,主要从事桥梁抗震研究。E-mail:chenchester2019@163.com。;通信作者:刘金龙(1978-),男,博士,副研究员,主要从事生命线工程抗震研究。E-mail:liujinlong@iem.ac.cn。
