设置抗拔型三重摩擦摆隔震支座框架结构地震响应分析

抗拔型三重摩擦摆隔震支座是一种新型隔震支座。以框架结构为例,利用ANSYS软件建立了6层和10层普通抗震结构和带该支座的基础隔震结构模型;通过模态分析,得到了结构的自振周期;通过地震响应分析,提取了6层框架隔震层和顶层的位移、加速度和剪力时程曲线,并提取了不同层数不同结构类型的各层间位移、加速度幅值。结果表明：与抗震结构相比,基础隔震结构周期显著增大;隔震结构的变形主要集中在隔震层,隔震层以上的结构基本为整体平动,结构的地震位移反应得到了有效的减小;采用抗拔型三重摩擦摆隔震支座能降低结构地震加速度反应;设置抗拔型三重摩擦摆隔震支座的多层数隔震结构的能量衰减不如低层数的隔震结构迅速。

Seismic Response of Frame Structure with Uplift Resistance Triple Friction Pendulum Isolation Bearing

The uplift resistance type triple friction pendulum bearing is a new type bearing.In this paper,taking frame structure as an example,the structural models for six-storey and ten-storey frames with and without base isolation were established using the software ANSYS.Through mode analysis,the structural self-vibration period was obtained.The displacement,acceleration and shear time-history curve of the isolation and top layers of the six-storey structure were drawn by seismic response analysis,and the inter-story drift,acceleration and shear amplitude of different layers and different structures were obtained.The results showed that the period of base isolation structure increased significantly compared with the common one.Inter-story drift of base isolation structure mainly focused on the isolation layer,while the upper layers of the structure perform translational movement as a whole.The seismic displacement response and seismic acceleration response of the base isolation structure reduced significantly.With the increase of layers,energy attenuation of the uplift resistance triple friction pendulum bearing type isolation frame structure becomes slowing.