考虑橡胶垫弹塑性性能及结构阻尼比变化的隔震结构动力分析  

DYNAMIC ANALYSIS OF BASE-ISOLATED STRUCTURES CONSIDERING NONLINEAR BEHAVIOR OF ELASTOMERIC BEARINGS AND VARIATION OF DAMPING RATIOS

作　　者：张玉良[1] 汪洋[1] 张铜生[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工程力学》2002年第2期58-63,共6页Engineering Mechanics

基　　金：北京市自然科学基金(3932002);清华大学结构工程与振动开放实验室基金(9803)

摘　　要：本文的主要工作:(1) 在一个通用的高层建筑空间动力分析程序HBTA[1]的基础上增加了铅芯叠层钢板橡胶垫的弹塑性本构关系,改进后的程序能够考虑橡胶垫在双向水平力作用下两个方向恢复力和位移相互耦合的弹塑性性能。(2) 为了反应橡胶垫隔震层与上部混凝土结构阻尼比不同的特点,本文还运用线性加速度逐步积分法和Wilson抭法的基本原理,推导出了适用于隔震结构动力方程的逐步积分公式,该公式能够同时进行隔震建筑上部和下部两个子结构动力方程的时程反应计算。笔者对上述工作进行了程序实现和实例计算,结果表明考虑上部结构及橡胶垫隔震层不同阻尼比是完全必要的。The main objective of this paper is to present a more reasonable numerical method for the time-history analysis of base-isolated structures. A nonlinear hysteretic model of elastomeric bearings is incorporated into a general nonlinear dynamic analysis program HBTA (Highrise Building Time-history Analysis). Biaxial nonlinear displacement behavior of elastomeric bearings under biaxial horizontal seismic forces is taken into consideration in the updated program. Different damping ratios are adopted to describe the damping behavior of the Upper-RC-stories and the bottom-elastomeric-isolation-story of the base-isolated structures. Based on the step-by-step integration method and the Wilson抭 method, a new solution algorithm suitable for base-isolated structures is presented, which can perform the time-history integration of two sub-structures simultaneously. From the dynamic analysis results of an eight-story-base-isolated reinforced concrete structure, it is concluded that the consideration of the difference of damping ratios in the structures is necessary.

关 键 词：橡胶垫 弹塑性性能 结构阻尼比 隔震结构 动力分析 阻尼比 HBTA 

分 类 号：TU352.12[建筑科学—结构工程]