门式刚架轻钢结构抗风性能研究  

STUDY ON WIND-RESISTANT PERFORMANCE OF LIGHT-WEIGHT STEEL PORTAL FRAME STRUCTURES

作　　者：白娜[1] 陈水福[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《钢结构》2015年第7期12-14,69,共4页Steel Construction

基　　金：住房和城乡建设部科技计划项目(2013-k6-13)

摘　　要：为探讨包括承重刚架和面外联系在内的三维门式刚架轻钢厂房结构达到极限状态时的抗风性能,以一沿海实际工程的轻钢厂房为例,采用壳单元和面外系杆单元建立精细的三维有限元模型,运用逐级加载的方法对结构进行加载至承载力极限状态的三维非线性有限元分析,并与平面模型的计算结果进行比较。结果显示,尽管来流风荷载是沿着刚架平面的,但刚架仍有较明显的平面外位移;两种模型的破坏模式均表现为第2榀刚架梁柱节点处的局部屈曲破坏,但三维模型进入屈曲时的应力明显低于平面模型,屈曲形态也有较大不同。In order to investigate the wind-resistant behavior of 3D light-weight steel portal frame structures including the load-bearing frames and out-of-plane supporting members reaching their ultimate limit states, an actual light-weight steel building structure was taken as an example and a refined 3D finite element model was established with shell elements and out-of-plane truss elements. A 3D nonlinear finite analysis was performed by using step-by- step loading method until the structure reaching the ultimate limit state. The obtained results were compared with those of a plane model. The results indicated that although the approaching wind was along t＇he frame plane, the out- of-plane displacements are still considerable. The failure modes determined by the two computational models were both shown as that of local buckling at the beam-column connections of the second frame. However, the stresses in the 3D model were much smaller than those of the plane model when entering the buckling state, and the detailed buckling patterns were also different.

关 键 词：门式刚架 轻钢结构 抗风分析 非线性分析 

分 类 号：TU392.5[建筑科学—结构工程]