高温下钢筋混凝土内部温度场数值模拟

Numerical simulation about internal temperature field of reinforced concrete under high temperature

针对高温下钢筋混凝土构件导热的非线性瞬态特点,全面考虑其热工参数和质量热容参数的变化时序性,把传热学理论与计算机数值模拟技术相结合,利用ANSYS热分析功能,模拟高温(火灾)作用下混凝土构件内部温度场的变化,应用瞬态温度场仿真程序对四面受火矩形截面柱和T形截面梁温度场进行了数值模拟,模拟结果较试验结果偏大的原为模拟未考虑结构构件实际火灾环境的散热。算例模拟表明,模拟结果与文献给出的试验结果图形曲线走向一致,验证了计算机数值模拟结果分析的适用性与正确性,为混凝土结构构件抗火分析提供了计算辅助手段与理论依据。

There is currently nonlinear transient characteristics in thermal conductivity of reinforced concrete component under high temperature.According to changes in the timing of many thermal and quality heat capacity parameters, hence numerical simulation for internal temperature field＇s variety of reinforced concrete under high temperature is presented by ANSYS thermal analysis.The method is based on the principle of energy conservation. By combining the numerical heat transfer theory and computer technology, analysis of square concrete pillar and T shape cross section beam on accepting the fire all around was simulated by the transient temperature emula- ted procedure, and the differences between simulations and measurement results were addressed. The example demonstrate that its results were fitted with the ones of the other method in the same direction.Reference is provide in design and evaluation for safety and durabili- ty of structure under high temperature.