变截面开口薄壁钢箱稳定性分析  

Stability Analysis of Open Thin-Walled Steel Box with Variable Cross-Section

作　　者：刘芳平[1,2] 周建庭[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]重庆三峡学院土木工程学院,重庆404000

出　　处：《重庆交通大学学报（自然科学版）》2012年第6期1105-1108,1255,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：重庆市重大科技攻关基金项目(CSTC2009AB6149);重庆市杰出青年基金项目(CSTC2008BA6038)

摘　　要：从薄板基本理论出发,利用单块板的平衡状态,将基本方程建立在变形后的结构上,用假想荷载法推导出了薄壁构件弯扭平衡微分方程;以变截面开口薄壁钢箱为研究对象,用有限元软件ANSYS对大量不同尺寸的结构进行了屈曲分析。研究发现:受竖向均布荷载作用下变截面悬臂开口薄壁钢箱有3种基本屈曲形态,即板件的局部屈曲、截面的畸变屈曲和构件的整体屈曲;随着结构尺寸的变化,一阶屈曲形式也在发生变化,并且呈一定的规律。The balance differential equations of bending and torsion of the thin-walled component were derived from notional load technique method,on the base of the deformed structure and the equilibrium of a single plate.On the other hand,a large number of different bucklings with open thin-walled steel box with variable cross-section are analyzed by using finite element program ANSYS.It is concluded that,by vertical uniform loads,the cantilever thin-walled steel box which has open and variable cross-section has three basic forms of buckling,that is,the local buckling of plate,distortion buckling of cross-section and overall buckling of the component.With the change of structural size,first-order buckling form also changes in certain rules.

关 键 词：薄壁钢箱 假想荷载法 稳定性 屈曲 

分 类 号：U443.35[建筑科学—桥梁与隧道工程]