RC框架结构地震塑性损伤分析

Analyses of seismic plastic-damage to reinforced concrete frames

基于经典塑性模型与连续损伤模型,根据广义应力空间塑性力学确定了塑性变形的演化法则,文中发展了一种地震塑性损伤分析方法。用来进行混凝土框架结构的抗震分析,将塑性损伤的本构关系运用于两端具有塑性铰的梁模型,模拟框架结构的梁柱。同时该方法的损伤指数可以确定结构各单元和整体的地震时性能,确定结构极限荷载,算例表明该方法具有可靠的精度。

A seismic plastic-damage analyses method for reinforced concrete frames is developed in this article, based on the classical plastic model and the continuum damage model. The Plastic-damage constitutive law is imple- mented into a beam model for framed structures, in which these are described by elastic beams and columns with two inelastic hinges at their ends. A damage index is useful in evaluating the state of structural members and a meaningful global damage index for whole structure are introduced. The method together with the member and glob- al damage indices, are adequate for the computation of the limit load of reinforced concrete frames subjected to seis- mic actions. Examples of applications of the methodology to the non-linear analysis of reinforced concrete framed structures were finally given. The result indicates that the method has reliable accuracy.