摘要
在深入研究了混凝土弹塑性本构理论基础上,提出了一个混凝土弹塑性本构模型,将Mande模型骨架曲线做一定的改进作为模型的等效单轴应力—应变曲线,加载硬化阶段采用应力空间弹塑性模型,软化阶段采用应变空间弹塑性模型,推导了应变空间下硬化参数的计算公式。模型屈服面采用黄克智—张远高三参数破坏准则,并推导了屈服面三个参数与混凝土强度之间的关系,为屈服面参数的确定提出了一种实用方法。将本文提出的模型在ABAQUS中二次开发,数值算法采用图形返回算法,通过几个算例表明本文提出的模型具有较高的计算准确度。
In this paper,elastic-plastic constitutive theory has been deeply studied and an elastic-plastic constitutive model is established.The Mande-model skeleton curve is used as equivalent uniaxial stress-strain curve,elastic-plastic model in strain space is used in hardening stage while elastic-plastic model in stress space is used in softening stage.The Huang Kezhi-Zhang Yuangao three parameters model is used as yield surface.The relationship between concrete strength and the parameters of the yield surface is derivated and a practical approach is gave to determine the parameters.This model is developed in ABAQUS,return-mapping algorithm is used as constitutive integration algorithm,it is proved that this model can accurately reflect a variety of constitutive behavior of concrete material through several numerical Simulations.
出处
《建筑科学》
北大核心
2011年第1期33-38,共6页
Building Science
