结构弹塑性等效线性化方法的研究  

Study of equivalent linearization methods for inelastic analysis of structures

作　　者：马英展[1] 刘文锋[1] 李怡[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《四川建筑科学研究》2008年第3期153-157,共5页Sichuan Building Science

基　　金：山东省教育厅科技计划项目(J07YA09-2)

摘　　要：等效线性化方法是估算结构最大弹塑性反应的实用化方法。等效线性化方法中,体系等效周期和等效阻尼比被视为位移延性系数的函数,把弹塑性体系等效为弹性体系来进行时程分析并求出结构最大反应。通过列举7种等效线性化方法——割线刚度法、平均刚度和能量法、平均刚度和阻尼法、Iwan方法、Hwang方法、Kowalsky方法、Iwan和Guyader方法,选取59个结构周期控制点、32条地震波,共进行了26432次弹塑性和等效线弹性时程分析。对每种等效方法的精度以及适用范围进行了对比和讨论,提出了选取等效线性化方法的建议。Equlvalent linearization methods are the practical methods to estimate the maximum inelastic response of structures. In the equivalent linearization methods, equivalent period and equivalent damping ratio of the system are computed as a function of the displacement ductility ratio, then an inelastic system is equaled to a linear elastic system and the maximum inelastic response are computed through time history analysis. Seven equivalent linearization methods are presented-secant stiffness method, the method based on the average stiffness and energy, the method based on the average stiffness and damping, the method by Iwan, the method by Hwang, the method by Kowalsky, the method by Iwan and Guyader, 59 periods of struetrues and 32 seismic waves are selectod, 26432 inelastic and equivalent linear elastic time history analyses are proceeded. Computation precision and applicability are compared and discussed for each method, and suggestions for selecting the equivalent linearization methods are presented.

关 键 词：弹塑性分析 等效线性化 最大反应 位移 精度 

分 类 号：TU312.1[建筑科学—结构工程]