摩擦摆隔震支座理论分析与数值模拟研究..doc

摩擦摆隔震支座理论分析与数值模拟研究 （广州大学土木工程学院， 广州 510006） 摘要关键词摩擦摆隔震支座；低周反复；滞回特性；回复能力；摩擦系数；半径 中图分类号TU352.1 文献标识码Study on the Theoretical Analysis and Numerical Simulation of Friction Pendulum Bearing GONG Jian, DENG Xue-song, ZHOU Yun (School of Civil Engineering , Guangzhou University , Guangzhou 510006 , China; ) Abstract: The basic structure and seismic isolation principle of friction pendulum bearing(FPB) are introduced, theoretical analysis study on FPB based on the principle of mechanical equilibrium is conducted, the stiffness and effective viscous damping ratio of FPB are derived and also the hysteretic model is constructed while its recovery mechanism is discussed and the computing formula of maximum residual displacement is obtained as well. Moreover, the model with solid element of FPB is built by using ABAQUS software, the hysteretic property under low cyclic loading and recovery characteristic are simulated. The results show that: (1) the results of numerical simulation agree well with theoretical analysis, the hysteretic model and the computing formula of maximum residual displacement proposed are verified; (2) FPB has favorable hysteretic property according to its plump hysteretic curve; (3) the stiffness of FPB is inversely proportional to the spherical radius, and the probable maximum residual displacement of FPB is the product of friction coefficient and spherical radius.; (4) the maximum stress of bearing appears when the bearing reaches its designed displacement, and it may generally situate in the edge of ball joint surface of slider or bearing plate. Key words: friction pendulum bearing; low cyclic; hysteretic property; recovery capability; friction coefficient; spherical radius 引 言 摩擦滑移隔震是开发应用最早的隔震技术之一摩擦滑移隔震通常由隔离地震的摩擦滑动机构和限位复位的阻尼向心机构组成平面滑移系统不能自动复位，一般需另外加设复位，且滑动性能离散性大、不易控制，滑移量过大，可能导致穿越隔震层的非结构构件破坏，甚至可能发生滑移失稳，这极大地阻碍了滑移隔震的发展。为了解决平面滑移系统不能自动复位这个问题，Zayas等人于1985年在美国加州大学伯克利分校研发了摩擦摆隔震装置[1-3]，称之为摩擦摆系统/支座(Friction Pendulum System/Bearing，简称FPS/FPB)。它除了具有平面