火灾下钢筋混凝土构件的弹塑性本构模型

An Elasto-plastic Constitutive Model for Reinforced Concrete Members Exposed to Fire

在弹塑性理论的基础上,考虑了材料性能随温度的变化,应用J2流动理论导出了高温下钢筋混凝土构件弹塑性增量本构模型,编制了该模型的有限元求解程序.该模型具有明确的物理意义,表达形式规范,便于数值手段实现.数值计算结果与现有的试验模型基本吻合.

Based on the elastic-plastic theory,it is considered that the material properties changed with temperature.The incremental constitutive equations of elastic-plastic structure of reinforced concrete members under high temperature are obtained with the J2 theory of flowing and a finite element program was developed.This proposed model possesses clear physics meaning and it is such a standard formulation that it is feasible for numerical application.It was found out that numerical results were in good agreement with the current ones for the material constitutive equations of elastic-plastic material.The developed program can be used for analysis on fire resistance of reinforced concrete structure under high temperature.