钢网壳抗火非线性有限元分析

Non-linear Finite Element Analysis of Fire Resistance for Steel Truss Dome

通过两种方式研究钢网壳的抗火性能,其一是对火的分析及单个构件的抗火力学性能分析;其二是对钢网壳结构进行抗火分析,以结构具有一定的抗火时间为标准,通过模拟预测实际火灾特性和结构的非线性有限元分析,求得直到倒塌时的结构抗火全过程响应,从而确定结构的抗火性能及临界温度。并通过一个实际的算例进行了结构的倒塌分析,得到了一些结论,从而对其实际抗火能力有一个理性的了解和认识,为经济、科学的结构综合防火设计提供理论依据。

Two approaches were used to quantify the behavior of steel truss domes in fire. One was to analyze the fire itself and mechanical properties of single steel component in fire. The other was to analyze the structure of steel tress domes in resisting against the fire. Taking definite fire resistance time possessed by the structure as the standard, practical fire characteristics and nonlinear finite element analysis of the structure were predicted by camputerized simultion to obtain the whole process response of structures under fire until they collapsed so as to quantify structural performance and critical temperature of the structure. The collapse of fire damage analysis was exemplified to obtain some conclusions. A rational understanding of practical fire resistance ability could be obtained, which could provide criteria for economical and scientific design in comprehensive fire-proof of the steel domes.