大跨度空间网壳结构抗火反应分析

Analysis of large-span space truss dome fire resistant response

以凯威特单层球面网壳为实例,采用ISO-834标准温度-时间关系曲线模拟火灾,用ANSYS软件中的瞬态热分析进行温度场的分布计算和力学分析,模拟了火灾发生在结构的不同部位对结构变形的影响以及结构的破坏形式。通过对计算数据的对比分析得出网壳结构在局部火灾作用下的临界温度和耐火时间以及各位置最大变形特性,利用ANSYS单元生死的功能对该结构的失稳破坏机理进行分析,从一定程度上反应出空间网壳结构的整体抗火性能。

This paper Kaiweite single-layer reticulated shell as an example, the ISO-834 standard temperature - the time of the fire simulation using ANSYS software in the transient thermal analysis of temperature distribution and mechanical analysis. Simulation of a structure fire occurred in a different part of the structural deformation of the form and structure of the damage. Based on comparative analysis of the data obtained in the local network of shell fire under the critical temperature and time as well as the location of fire-resistant maximum vertical displacement, and to ANSYS software modules fate of the structure of the function of failure mechanism analysis, to some extent, the response from the space structure of the overall network shell fire resistant properties.