带翼缘十字形截面轴心受压构件扭转失稳边缘屈服荷载研究  

Study on Yield Load of Torsion Buckling Edge of Members with Flange Cross Section Under Axial Compression

作　　者：张仲祥 宋振森[1] 陈行威 ZHANG Zhongxiang;SONG Zhensen;CHEN Xingwei(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200110,China)

机构地区：[1]上海交通大学船舶与建筑工程学院,上海200110

出　　处：《结构工程师》2021年第2期11-16,共6页Structural Engineers

摘　　要：带翼缘十字形截面柱具备各向等稳定、抗扭刚度高、对称美观等特点,但目前对于这类构件扭转失稳承载力的研究还比较少。推导出带翼缘十字形截面轴心受压构件的边缘屈服荷载的隐式表达式,考察了翼缘宽度、腹板高度、翼缘厚度以及腹板厚度等截面几何参数对边缘屈服荷载的影响,结果表明带翼缘十字形截面轴心受压构件在给定初始扭转缺陷和残余应力的前提下,构件的边缘屈服荷载与扭转长细比λ_ω有直接关系,与翼缘宽度、腹板高度、翼缘厚度以及腹板厚度等截面几何参数没有明显的关系。最后利用Taylor展开式对隐式表达式简化,得到边缘屈服荷载的拟合公式。The flanged cruciform column has the characteristics of isotropic stability,high torsional stiffness,symmetrical aesthetics,etc.However,there are few researches on the torsional buckling capacity of such members.This article deduces the implicit expression of the marginal yield load of a member with a flange cross section under axial compression.And inspecting the flange width,height,thickness of the flange and web thickness section geometric parameters on the edge of the yield load,the results show that under the premise of initial torsion imperfections and residual stress,the marginal yield load of a member with flange cruciform cross section is directly related to the ratio of torsion length to ratio ofλ_ω,but has little relation with the geometrical parameters of flange width,web height,flange thickness and web thickness.Finally use the Taylor expansion to simplify the implicit expression,then obtain the the fitting formula of edge yield load.

关 键 词：带翼缘十字形截面 边缘屈服荷载 轴心受压 

分 类 号：TU312.1[建筑科学—结构工程]