高大空间火灾空气升温条件下整体网架抗火性能分析

FIRE RESISTANCE ANALYSIS OF INTEGRAL SPACE TRUSS STRUCTURE UNDER LARGE SPACE FIRE AIR TEMPERATURE CONDITIONS

为了研究网架在高大空间火灾空气升温条件下的抗火性能,结合某正放四角锥网架,采用有限元方法对网架在高大空间温度场下的抗火性能进行模拟分析。火源中心分别选择了3种不同位置对结构进行温度场划分和抗火分析。确定网架结构的耐火极限准则,得到不同工况下结构的极限抗火时间;研究不同工况下结构的内力、位移等响应变化过程及分布规律;同时对比分析各工况下网架结构抗火性能的差异。

In order to study the high temperature properties of space truss structure in large space fire, and combined with a pyramidic space frame finite element method was used to simulate and analyse the fire resistance of integral space frame under large space fire of different temperature field distribution. According to the analysis, three different locations in fire center were selected to do the division of temperature field and fire resistance analysis of the structure, which determined the fireproof limit criterion of the space truss structure, the fire resistance time limit under different conditions were got under various conditions; the structure internal force, displacement and the change of distribution were studied; at the same time it was also compared the fire resistance of truss structure under different conditions.