摘要
隔震技术在提高多跨桥梁抗震性能方面已有广泛应用,然而传统隔震支座在近场脉冲地震动作用下容易产生残余位移较大、底部剪力水平较高、以及限位能力不足等问题。目前尝试解决上述问题主要有2个途径:一方面利用形状记忆合金(shape memory alloy,SMA)的隔震支座能有效控制峰值位移和残余位移,但同时会增加结构的内力响应;另一方面,利用负刚度(negative stiffness device,NSD)的隔震支座可以有效减小结构的内力响应,但可能会引起较大的残余位移。基于太平洋地震研究中心数据库提供的28条近场脉冲波,充分评估了间隙式SMA隔震支座和NSD隔震支座应用于多跨简支桥梁在四水准(小震、中震、大震和巨震)作用下的隔震性能。在此基础上,结合SMA与NSD各自的优点,提出一种间隙式SMA-NSD摩擦隔震支座并分析了其隔震性能。研究结果表明,该支座可显著降低NSD支座引起的残余变形并同时有效控制SMA支座引起的底部剪力。
Seismic isolation technology has been widely used to improve the seismic performance of multi-span bridges.However,traditional isolation bearings are prone to large residual displacement,high bottom shear level and insufficient limit capacity under the influence of near-field pulse ground motions.At present,the research to solve the above problems can be divided into two directions:one is shape memory alloy(SMA)isolation bearings which play a good role in controlling the peak displacement and residual displacement,but it will increase the internal force demand;the other is negative stiffness device(NSD)isolation bearings which can effectively reduce the internal force demand,but may cause large residual displacement.In this paper,based on 28 near-field pulse waves from the database of Pacific Earthquake Engineering Research Center(PEER),the seismic isolation performance of a multi-span simple supported beam bridge with gap SMA bearing and NSD bearing under four levels(slight,moderate,extensive and collapse)is fully evaluated.On this basis,combined with the respective advantages of SMA and NSD,a gap SMA-NSD-FPB isolation bearing is proposed and its isolation performance is analyzed.The results show that the residual deformation caused by NSD bearing and the bottom shear caused by SMA bearing can be significantly reduced by this novel bearing.
作者
王萌
李承甜
唐雨晴
邱灿星
杜修力
WANG Meng;LI Chengtian;TANG Yuqing;QIU Canxing;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第4期37-44,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(52178267)
博士后创新人才支持计划项目(BX20220026)。
关键词
隔震桥梁
形状记忆合金
负刚度
摩擦摆支座
近场脉冲地震动
isolated bridge
shape memory alloy
negative stiffness
friction pendulum bearing
near-fault pulse-like ground motions
