摘要
结构钢本构关系的精度直接影响分析结果的可靠度。根据能量等效性假设、热力学第二定律,推出损伤材料的弹性本构方程;采用混合强化准则,考虑Bauschinger效应、屈服平台、硬化(软化)效应及损伤和损伤演化影响,建立了的结构钢弹塑性各向异性损伤本构关系。结合构建的本构关系,采用八节点超参数壳体单元,推导了用U.L.格式及Cauchy应力描述的板壳双重非线性有限元方程,并编制了计算程序。利用U.L.格式的壳体大挠度双重非线性有限元分析方法,对钢方管截面短柱进行面内拉压循环荷载作用下的滞回性能分析。
Considering the requirement of the precise stress-strain relationship, the elastic anisotropic damage model was presented based on the hypothesis of energy equivalent and the second law of the thermodynamics. The elastoplastic anisotropic damage model of the constructional steel was also presented, which considers the mixed hardening criterion, Bauschinger effect, yield plateau, hardening (softening) influence, damage and damage evolution. Based on the constitutive model of the constructional steel and the 8-node degenerate shell element, the updated Lagrange (U.L.) formulations for FEM analyses were derived. After developing and debugging program, the method of double nonlinear shell FEM was adopted to analyze the steel box section columns under the action of cyclic uniaxial load.
出处
《力学季刊》
CSCD
北大核心
2001年第4期502-507,共6页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(59678030)
