曲线连续梁桥不同减隔震方案对比分析  

Comparative analysis of seismic control schemes for continuous curved girder bridges

作　　者：李正英[1] 蒋林均 李正良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400044

出　　处：《振动与冲击》2016年第10期157-161,173,共6页Journal of Vibration and Shock

基　　金：中央高校基本科研业务费(CDJZR12205528);国家自然科学基金(50908245)

摘　　要：采用减隔震装置可有效减小连续梁桥的地震反应。选取一曲线连续梁桥,根据该桥的地震反应特点,分别采用铅芯橡胶支座、黏滞阻尼器、摩擦摆支座三种减隔震装置进行减震控制。通过动力非线性时程分析,对比了三种减震装置的减震效果,发现铅芯橡胶支座和黏滞阻尼器对边墩的墩底切向反力有放大作用,摩擦摆支座对主梁位移有放大作用;三种单一的减震措施难以完全满足该曲线连续梁桥减震控制要求。为此在单一的减震措施基础上进行改进,形成混合减震控制方案。分析表明,改进的混合减震措施可以弥补单一减震措施的不足,取得良好的减震效果。Installing isolation bearings on bridge is the main seismic control measure for multi-span girder bridges. A continuous curved girder bridge was taken as an example,and lead-rubber bearings （LRB）,viscous dampers and friction pendulum bearings （FPB）were respectively employed on the bridge to mitigate its seismic response.The nonlinear dynamic analysis shows that LRB and viscous dampers may amplify the side columns＆#39;tangential base reaction and FPB may magnify the displacements of girder.The three kinds of seismics control schemes can＆#39;t satisfy the objective seismic control.Then a comprehensive seismic mitigation measure was proposed based on the preceding comparative analysis.The results of these analyses show that the combined isolation is superior to those seismic control schemes in which only one type of isolation bearing is used,and the combined isolation scheme can be beneficial in reducing seismic responses of bridges.

关 键 词：曲线桥 铅芯橡胶支座 黏滞阻尼器 摩擦摆支座 混合减隔震 

分 类 号：U443[建筑科学—桥梁与隧道工程]