存在初始几何缺陷的薄壁变壁厚圆钢管柱的稳定性分析  

Stability analysis of thin-walled variable-thickness steel pipe column with initial geometrical defect

作　　者：王雨[1] WANG Yu(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑结构》2020年第S01期730-733,共4页Building Structure

摘　　要：当存在初始几何缺陷的薄壁变壁厚圆钢管柱在复合荷载作用下的稳定性计算尚无规范可查。结合实际工程,采用理论分析法和有限元分析法对某特殊造型结构的8根薄壁变壁厚圆钢管柱进行稳定性研究。利用有限元分析软件研究了初始几何缺陷和变壁厚对薄壁钢管柱稳定性的影响。研究了同时受柱顶集中力和竖向均布附加力时,两种荷载作用比例不同时对计算长度系数的影响,并给出了曲线拟合公式。通过考虑附加初始缺陷和材料非线性的屈曲分析,验证了结构稳定性满足要求。研究可为具有初始几何缺陷和变截面的薄壁构件设计提供借鉴。The calculation method for thin-walled variable-thickness steel pipe columns with initial geometric defects under combined loads cannot be found in current codes.The stability of 8 thin-walled variable-thickness pipe columns with special shape was studied by theoretical analysis and finite element analysis.The effects of initial geometric defects and variable-thickness on the stability of thin-walled pipe columns were studied by using finite element analysis software.The influence on the effective length coefficient caused by the different proportion of the two loads,which are the concentrated force on the top of the column and the additional vertical uniform force were studied.It turns out that the structural stability meets the requirements by the nonlinear buckling analysis that considered the additional initial defects and material nonlinearity simultaneously.This research can provide reference for the design of thin-walled columns with initial geometric defects and variable cross-section.

关 键 词：薄壁构件 变截面钢管柱 初始几何缺陷 稳定性分析 

分 类 号：TU392.3[建筑科学—结构工程]