火灾下钢筋混凝土构件的弹塑性本构模型

摘要

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.%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.