近场地震作用下三重摩擦摆隔震结构的动力响应分析

摘要

利用通用结构设计与分析软件SAP2000分别建立了一幢8层带裙房钢筋混凝土框架的抗震结构、三重摩擦摆层间隔震结构和三重摩擦摆基础隔震结构.对比分析了三种结构在近场地震中的动力响应.结果表明:(1)三重摩擦摆隔震支座不仅对远场地震有效,对近场地震依然有很好的减震效果;(2)对于三重摩擦摆层间隔震结构,由于隔震层下部结构为抗震结构,地震反应有所放大,设计时应该予以考虑;(3)近场地震作用下,三重摩擦摆隔震支座能够保证结构的变形始终限制在弹性范围内,限制了不规则结构出现平移-扭转的情况,从而避免结构发生严重的扭转破坏.%In this dissertation,three eight-floor high reinforced concrete frames with podium are built respectively in aseismatic structure,triple layer friction pendulum interval structure and triple friction pendulum base isolation structure based on SAP2000.By contrasting and analyzing the dynamic response of the three kinds of structure of in the near-field earthquake,the results show that:① triple friction pendulum isolation bearing not only has good effect on far-field earthquake,but also has a damping effect on near-field earthquake;②in triple layer friction pendulum interval structure,as the bottom structure of isolation layer is aseismatic structure,the seismic response is enlarged,therefore,this structure should be considered when designing;③Under the action of near-field earthquake,triple friction pendulum isolation bearing can ensure that the deformation of the structure has kept within the elastic range,and prevent the irregular deformation from appearing the translation-reversion condition,so it can avoid serious torsional damage on structure.