叠层橡胶支座与抗风支座组合隔震反应分析

为研究隔震层增设抗风支座对处于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；而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。

Response analysis of the compound isolation structure consisting of laminated rubber bearing and wind-resistant support

To investigate the vibration effect on setting wind-resistant bearing at isolation layer when the structure locates at large wind pressure area. Taking an actual base-isolated structure as background, goals were setted which structural horizontal damping coefficient is less than 0.53 and 0.40. setting or no-setting wind resistant bearing isolated models were established, though dynamic time-history analysis it is compared about structural seismic response. The results show that seismic response of the two isolation models is significantly decreased compared with seismic structure. For no setting wind resistant bearing model, LRB number is increased to meet the wind design requirements, but seismic effect is reduced. While for setting wind resistant bearing model, LRB number is reduced, which benefits seismic effect. Under normal operation and small earthquake, wind resistant bearing functions and isolation layer does not yield, when the structure suffers fortification earthquake , the wind resistant bearing shall yield and destroy and be out of work, which dose not affect the upper structure seismic effect.