混凝土框架结构抗震分析的塑性损伤模型

Plastic-damage Seismic Model for Reinforced Concrete Frames

地震作用下,结构会遭受损伤。为了对结构进行损伤评估,本文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塑性变形的演化法则,建立了一种塑性损伤模型,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在两端具有塑性铰的梁模型,模拟框架结构的梁柱。同时该模型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,算例表明该模型具有可靠的精度。

Under earthquake,structures are damaged in a certain extent.A plastic-damage model for reinforced concrete frames is developed in this paper to evaluate RC frame damage,based on the classical plastic model and the continuum damage model.The Plastic-damage constitutive law is implemented 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 useful in evaluating the state of structural members and a meaningful global damage index for whole structure are introduced.The plastic-damage model,together with the member and global damage indices,is adequate for the computation of the limit load of reinforced concrete frames subjected to seismic actions.Application examples of the methodology to the non-linear analysis of reinforced concrete framed structures are finally given.The result indicates that the model has reliable accuracy.