弹塑性基础隔震结构的振型叠加方法  

MODE SUPERPOSITION METHOD FOR ELASTOPLASTIC BASE-ISOLATED STRUCTURE

作　　者：刘纪陆[1] 

机构地区：[1]汕头大学土木系,广东汕头515063

出　　处：《工程力学》2007年第6期153-158,110,共7页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50478119)

摘　　要：针对具有弹塑性滞回性质的基础隔震结构,提出一种新的求解方法。在弹性和塑性的每一个阶段分别利用振型叠加法,并通过准确地求出隔震层弹塑性转换时刻,这种求解方法能够得出结构动力响应的精确解。所提出的方法兼有解析方法和数值方法优点,又避免了它们所固有的问题。由于有精确解作为基础,不但大大减少了计算工作量,而且彻底地避免了许多数值方法所常遇到的精确性、收敛性和稳定性问题。A new solution technique for the dynamic response of the structure with elastoplastic hysteretic base isolation devices has been developed. The proposed approach can offer an exact solution for dynamic response of base-isolated structure by means of the mode superposition method in each elastic and plastic phase, between which the transitional time must be obtained and employed. The proposed method combines merits of both analytic and numerical method. Therefore, it not only requires much less computational effort, but also thoroughly avoids the trouble such as accuracy, convergence and stability encountered in many other numerical procedures.

关 键 词：地震工程 基础隔震结构 动力响应 非线性系统 振型叠加法 

分 类 号：TU311.3[建筑科学—结构工程] O321[理学—一般力学与力学基础]