地震工程学-弹塑性结构地震反应分析.pdf

第六章 弹塑性地震反应分析 General • The analysis process, which leads to the evaluation of seismic actions and deformations, invokes knowledge from several sub-disciplines in engineering. • To perform reliable seismic analyses of structural systems, a conceptual framework is required. Definitions  Stiffness  The ability of a component or assembly of components to resist deformations when subjected to actions  Strength  The capacity of a component or an assembly of components for load resistance at a given response state.  Ductility  The ability of a component or an assembly of components to deform beyond the elastic limit. Definitions  Demand  The action or deformation imposed on a component or assembly of components when subjected to earthquake ground motion.  It continuously varies as the structural characteristics vary during inelastic response.  Supply  The action or deformation capacity of a component or assembly of components when subjected to earthquake ground motion.  It may continuously vary as the structural characteristics change during inelastic response. General General General Typical methods of analyses and relative earthquake input representations 目录  6.1 弹塑性动力分析的一般过程  6.2 结构模型  6.3 多维地震波作用下的平－扭耦联系统  6.4 非线性地震反应分析的Ritz向量叠加法 6.1 弹塑性动力分析的一般过程  6.1.1 动力方程  6.1.2 刚度修正技术  6.1.3 一般分析过程 6.1.1 动力方程 [M ] {U}+ [C] {U}+ [K ] {U}= -[M ]{U } g 全量 vs 增量? [M ]{U}+[C]{U}+{F} = -[M ]{U } g f j+1 = f + k DU