叠层橡胶支座与抗风支座组合隔震反应分析

摘要

To investigate the vibration reduction effect of wind-resistant supports added on an isolation layer when an isolation structure locating at a large wind pressure area,taking an actual base-isolated structure as a background, setting goals that structural horizontal damping coefficient was less than 0.53 or 0.40,two models for the isolation structure with and without wind-resistant supports were established.Adopting the dynamic time-history analysis,the structural seismic responses of these two models were compared.The results showed that the seismic responses of the two models are significantly reduced compared with that of an aseismic structure;for the model without wind-resistant supports, LRB number increases to meet the anti-wind design requirements,but its aseismic effect reduces;while for the model with wind-resistant supports,LRB number decreases,its aseimic effect rises;under normal operation conditions and small earthquake,wind-resistant supports join working and the isolation layer does not yield,when the structure suffers a fortification earthquake ,the wind resistant supports yield,they are destroyed and out of work,but they do not affect the upper structure's aseismic effect.%为研究隔震层增设抗风支座对风压较大地区的隔震结构减震效果的影响，以某实际隔震工程为背景，设定结构水平向减震系数分别小于0．53和0．40的目标，建立有（无）设置抗风支座的两种隔震结构模型，采用时程分析法对比结构在地震作用下的响应。结果表明，相比较于抗震结构，两种隔震结构地震响应都有显著的降低；无抗风支座隔震方案增加了LRB数量，满足抗风设计要求，但降低了减震效果；有抗风支座隔震方案，减少了LRB的数量，提高了减震效果。在正常使用条件和小震作用下，抗风支座参与工作，隔震层不屈服，当结构遭遇中震作用时，抗风支座能屈服并破坏，退出工作，不影响上部结构的减震效果。