受压焊接空心球节点火灾下的性能分析

Performance Analysis for the Compression Capacity of Welded Hollow Spherical Joints in Fire

基于火灾下网格结构的性能和受力特征,根据欧洲规范和国际标准升温曲线(ISO834),对单向受压焊接空心球节点火灾下的性能进行了非线性有限元数值模拟,分析了节点的温度场分布规律和影响因素.通过分析火灾下节点的应力和位移变化特征,确定了其破坏模式.结果表明:增大焊接钢管的壁厚和降低焊接空心球实际承受的荷载可以有效地延长受压焊接空心球节点的极限耐火时间;钢管根部是火灾下受压焊接空心球节点的薄弱环节.

Based on the properties and stress characteristics of space frame structures under fire,the nonlinear finite element numerical simulations are performed on the properties of the welded hollow spherical joints bearing axial compression under fire with the thermal parameters specified in the EUROCODE 3 and the standard fire temperature-time curve ISO834.The distribution law and influencing factors of the temperature fields are analyzed.By analyzing the stress and displacement variation characteristics of the ...