钢筋混凝土受弯构件三面受火时非线性分析

Nonlinear analysis of fire resistance of RC bending members subjected to three-side fire

采用三维非线性有限元法对钢筋混凝土梁在受火时力学性能进行了描述 ,钢筋混凝土截面温度场的分布用简化数值法来进行计算 ,然后将其结果输入到有限元程序中进行时间 -温度应力全过程分析 .分析了各种参数对混凝土梁在受火时性能的影响 .

A three dimensional non linear element was presented to describe the behaviors of reinforced concrete beams subjected to fire. The temperature distribution in the section of concrete beam was calculated by the Hertz's simplified method. This distribution was input into the FE program for doing the time dependent thermal stress analysis. The influence of main parameters on the behavior of concrete members subjected to fire was analyzed. It was shown that the fire resistance and performance of concrete beams in fire could be predicted with the procedure.