多层框架结构火灾危险性的数值分析

Numerical Simulation of Frame Structure Risk in Fire

采用FDS和FORTRAN77语言程序相结合的方法,通过组合梁的热-力耦合分析,建立了组合梁的受火分析和热-力性能模型,并对两层组合梁在火场中的温度场、剪切力、弯矩、变形和位移进行了模拟计算。计算结果发现:单室火灾中,梁上部一般为正面受火区域;而最大位移一般出现在正面受火结构的中部位置;对于两层框架结构,其热损伤危险点易出现在火场的邻近区域或对角区域。

In this paper the fire temperature model and thermal- force performance model of composite beams has been establishment by a FORTRAN77 program, which is based on FDS simulation and the analysis of coupled relationship between thermal and mechanical performance. Through the program mentioned above, the temperature, cutthe shear force, bending moment, deformation and displacement of two layers of composite beams in fire was simulated. The results showed that:in the single room fire, the upper beam is generally positive fire area;maximum displacement generally appear in the middle of the structure positive fire area; for two frame structure, the risk of thermal injury prone point is in the adjacent area of the fire or diagonal regional.