火灾均匀温度场中正放四角锥网架结构临界温度研究

随着温度的升高，钢材的力学性能将会发生较大的变化。钢结构在均匀温度场达到承载能力极限状态时的临界温度是钢结构抗火性能的重要特征，而网架结构的临界温度主要受网架的几何特征、荷载比、构件稳定应力的影响。本文通过对不同参数条件下正放四角锥网架结构在均匀温度场中结构反应全过程分析，得到不同参数条件下正放四角锥网架结构的临界温度，为大空间建筑网架结构抗火设计实用方法提供理论依据。

Critical Temperature of Regular Half-Octahedra Grid Structure in Uniform Fire Temperature Field

When steel structures are exposed to a fire,the structural material properties will be changed by elevated temperatures.The critical temperature at which a steel grid structure is in the limit state of load-bearing capacity is an important feature of the grid structure.Critical temperature depends on geometric attribute,load ratio and member buckling stress ratio of the grid structure in fire condition.The critical temperature of a regular half-octahedra space truss can be obtained by analyzing its response in uniform temperature field.The effects of geometric attribute,load ratio of complete structure and stress ratio of structural components on the critical temperature of the regular half-octahedra space truss are discussed.The practical approach for fire resistance design of large space building grid structures is proposed through analyzing the regular half-octahedra space truss response in the uniform temperature field.