受拉焊接空心球节点火灾高温下的性能分析  

Tension Performance of Welded Hollow Spherical Joints under Fire

作　　者：邱林波[1,2] 薛素铎[1] 李雄彦[1] 冯淼[1] 

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]北京工业大学空间结构研究中心,北京100124

出　　处：《建筑钢结构进展》2011年第3期9-14,共6页Progress in Steel Building Structures

基　　金：北京市自然科学基金(8082004);北京工业大学博士研究生创新计划(bcx-2009-022)

摘　　要：基于火灾高温下空间网格结构的性能,本文根据欧洲规范了中高温下的钢材特性和国际标准升温曲线(ISO834),对单轴受拉焊接空心球节点高温下的性能进行了数值模拟,分析了空心球的温度场分布规律和极限耐火时间的影响因素。通过分析高温下空心球的应力和位移变化特征,确定了其破坏模式;结果表明钢管根部和赤道处是其高温下受拉承载力的薄弱环节。Based on the properties and stress characteristics of space frame structures under fire, the tension properties of the welded hollow spherical joints under fire are numerically simulated with the thermal parameters of steel specified in the EUROCODE 3 and the standard fire temperature-time curve ISO834. The distribution law of the temperature fields and the influencing factors of the ultimate fire resistant duration are analyzed. By analyzing the stress and displacement variation characteristics of the hollow spherical joints under fire, their failure modes are determined. The results show that the steel tube root and the equator are the weak parts of the welded hollow spherical joints subjected to tension under fire.

关 键 词：焊接空心球节点 火灾 有限元分析 受拉性能 

分 类 号：TU352.5[建筑科学—结构工程] TU393.3