门式刚架平面内失稳类型的判别  

Mode discrimination of in-plane instability of portal frame

作　　者：王秀丽[1] 吕辉勇[1] 孙维[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2007年第1期121-124,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省建设科技攻关项目(JK-200302)

摘　　要：平面内失稳的类型主要有对称失稳和侧移失稳两种.为了判断门式刚架结构的失稳类型,利用ANSYS有限元程序,对计算模型进行几何非线性分析,从拱效应比值Ω和水平荷载与竖向荷载比值Ω0入手,作出刚架的荷载位移关系曲线.分析曲线后得出:对于柱脚铰接门式刚架,当Ω0/Ω≤0.1,刚架随着荷载的增加发生对称失稳;对于柱脚刚接门式刚架,当Ω0/Ω≤0.6,则刚架随着荷载的增加发生对称失稳.Symmetrical instability and sideways instability are the two modes of in-plane instability. The ANSYS finite element program was used to perform the analysis of geometrically nonlinear for the computation model. The load-deflection relation was obtained according to on the arch effect ratio Ω and the ratio of vertical load to horizontal load Ω0. It was indicated by analyzing the load-deflection curves that, when the ratio of Ω0 to Ω was equal to or less than 0. 1, the instability was of symmetric buckling mode for hingeconnected frame and, when the ratio of Ω0 to Ω was equal to or less than 0.6, the instability with the same mode would happen to rigidly connected frame.

关 键 词：拱效应比 水平荷载与竖向荷载比 对称失稳 侧移失稳 

分 类 号：TU312.3[建筑科学—结构工程]