三重摩擦摆支座多阶段隔震性能的控制参数分析

Parameter Analysis on Controlling Multi-stage Seismic Isolation Performance of the Triple Friction Pendulum Bearings

简要介绍了三重摩擦摆支座的基本原理和力-位移关系,分析讨论了三重摩擦摆支座用于数值模拟的串联模型及其数值模拟的实现方法。以一装设三重摩擦摆支座的六层钢筋混凝土框架结构为算例,利用串联模型模拟三重摩擦摆支座,采用SAP2000进行建模分析。选择3组分别对应众值烈度、基本烈度以及罕遇烈度水准的地震动记录,对该隔震结构动力模型进行非线性时程分析,研究了支座滞回特性以及中周期支座和长周期支座的参数变化对隔震结构地震响应的影响。分析结果表明:支座的滑移面半径和滑移面摩擦系数对中周期支座隔震结构响应的影响较大,而滑移面半径和支座位移能力对长周期支座隔震结构响应的影响较大。

The operation principles and force-displacement relationships of triple friction pendulum ( TFP) bearings were briefly introduced and the series model and numerical modelling of the TFP bearing were discussed first. Then,a six-story reinforced concrete frame building isolated with triple friction pendulum bearings was taken as case study and modelled via SAP2000 with series model to simulate TFP bearings. And three different levels of ground motion records corresponding to frequent,moderate and rare earthquake in the Chinese seismic design codes were selected and nonlinear time history analysis was conducted on the baseisolated building with different controlling parameters under these ground motion records. The hysteretic behavior of the TFP bearings with different controlling parameters and the influence of moderate-period and long-period bearings with different controlling parameters on the seismic response of the isolated building were investigated. The analytical results show that the response of the isolated building with moderate-period TFP bearings is sensitive to curvature radius and friction coefficient of the bearings. On the other hand, the response of the isolated building with long-period TFP bearings is much affected by curvature radius and displacement capacity of the bearings.