钢筋混凝土柱在高温下的数值模拟

利用有限元软件对高温下钢筋混凝土柱作三维温度场和三维结构的非线性分析,考虑火灾试验中柱子只在中部受火和柱端实际加载条件.研究结果表明,本文对钢筋混凝土柱的耐火性能预测较准,但对其高温变形曲线的预测精度尚有待进一步改善;钢筋混凝土柱在高温下采用实体单元模拟计算花费时间过长,编制高温下的专用数值模拟分析程序是必要的.

Numerical Simulation of Reinforced Concrete Columns under Elevated Temperature

Reinforced concrete columns under the elevated temperature were analyzed with both three dimensional temperature field and the nonlinear structural behavior by using finite element software, but only the middle parts of the column in the fire test were exposed to fire and the actual constraints in the end of the column could be considered. The results indicate that the fire resistance of reinforced concrete columns can be predicted with a reasonable accuracy while the accuracy of predicted displacements under the elevated temperature need further research; It is necessary to develop a special computer program to simulate the performance of reinforced concrete columns under the elevated temperature, as the numerical simulation by using solid element is time consuming.