单轴对称薄壁钢压柱局部和整体相关作用

通过27根剖分T型钢压杆试验,借助通用有限元软件对单轴对称钢压杆的整体与局部相关屈曲做了计算分析,分析时考虑了残余应力、几何和材料的非线性等因素的影响.分析结果表明,畸变变形不容忽视,整体分析时应考虑局部屈曲和畸变屈曲的影响,三者不宜分开考虑.按照等稳定原则设计,薄壁构件对初始缺陷较为敏感,整体和局部相关作用明显.

Local- overall interactive buckling of singly symmetric thin- walled struts

A test program of 27 cut-t struts was performed.Based on that,a nonlinear analysis of interaction between local and overall buckling on singly symmetric struts is made by using the general finite element software.In the analysis,factors such as residual stress as well as geometric and material nonlinearity are considered.It was shown that distortional buckling and local buckling should be taken into consideration when overall buckling is under analysis.Meanwhile these three bucklings are not suitable to study separately.The thin-walled struts,which were designed under the principle of equal-stability,are sensitive to the initial imperfections and the phenomenon of interactive buckling is more evident.