（1 天津大学建筑工程学院， 天津 300072； 2 天津大学建筑设计规划研究总院有限公司， 天津 300073）

［摘要］采用基于计算的钢结构耐火分析方法，利用高大空间火灾升温公式进行火灾温度场分析，继而将火灾高温荷载进行偶然荷载组合并施加在复合式索穹顶结构上。利用有限元法分析研究了复合式索穹顶结构在火灾高温荷载工况下的力学性能；并改变火源位置、火源释热功率、火源燃烧速率以及火源单位面积释热功率四种参数，探究不同火源参数对复合式索穹顶结构力学性能的影响。根据火灾高温下复合式索穹顶结构力学性能的参数分析，提出了结构耐火分析建议。

［关键词］复合式索穹顶结构； 火灾温度场分析； 有限元法； 力学性能； 火源参数

中图分类号：TU393-3， TU394文献标识码：A文章编号：1002-848X(2020)23-0024-07

Parametric analysis on mechanical properties of composite-type cable dome structure under high temperature of fire

YU Jinghai1,2, TANG Yuxuan1, ZHANG Zhongyu1, LI Luchuan2, YAN Xiangyu2

(1 School of Civil Engineering， Tianjin University， Tianjin 300072， China； 2 Tianjin University Research Institute of Architectural Design and Urban Planning Co., Ltd., Tianjin 300073，China)

Abstract:The fire resistance analysis method of steel structure based on calculation was used to analyze the temperature field of fire by using the large-space fire heating formula, then the high-temperature fire load was combined by accidental load and applied to the composite-type cable dome structure. The mechanical properties of composite-type cable dome structure under high temperature load were analyzed by finite element method; the four parameters of fire, which are fire source location, fire source heat release power, the fire source combustion rate and fire source heat release power per unit area were changed to explore the effect of different fire source parameters on the mechanical properties of composite cable domes. According to the parametric analysis of mechanical properties of composite-type cable dome structure under high temperature of fire, the fire resistance suggestions of the structure were proposed.

Keywords:composite-type cable dome structure; fire temperature field analysis; finite element method; mechanical property; fire source parameter

*天津市创新创业团队特殊支持项目（TJTZJH-GCCCXCYTD-1-3）。

作者简介：于敬海，博士，研究员，博士生导师，Email:yjh300072@163.com。