火灾作用下钢交错桁架结构体系的力学响应分析  

Mechanical Response Analysis of Steel Staggered-truss System under Fire Conditions

作　　者：陈长坤[1] 肖荣[1] 张鹏 

机构地区：[1]中南大学防灾科学与安全技术研究所,湖南长沙410075 [2]中国浦发机械工业股份有限公司,上海200061

出　　处：《火灾科学》2008年第3期131-136,共6页Fire Safety Science

基　　金：国家自然科学基金项目(50706059);河南省煤矿瓦斯与火灾防治重点实验室开放基金项目(HKLGF200503)

摘　　要：钢结构交错桁架结构是一种经济、实用、高效的结构体系,对其在火灾作用下的力学响应进行分析对该体系的抗火设计具有重要意义。采用数值模拟的方法对无防火保护的空腹钢结构交错桁架体系在局部火灾作用下的力学响应性能进行了瞬态过程分析,结果表明:局部火灾下,空腹钢结构交错桁架体系更易发生强度失效;桁架弦杆比腹杆和柱先失效,进行防火设计时应着重考虑弦杆的防火问题。The steel staggered -truss system is an economical, practical and highly effective structural system. It is significant to ana- lyze its mechanical responses under fire conditions. In this paper, the mechanical characteristics of unprotected steel staggered-truss system subjected to local fires were studied using numerical method. The results indicated that： the system was easily to be destroyed for its strength failure under local fire conditions. In comparison with the brace and column, the chord is easier to fail. So the fire protection of the chord should be paid more attention in design.

关 键 词：交错桁架 火灾 力学特性 钢结构 

分 类 号：TU892[建筑科学]