不锈钢芯板一字形墙轴心受压承载力研究

RESEARCH ON THE BEARING CAPACITY OF THE IN-LINE WALL OF THE STRUCTURE OF STAINLESS STEEL SANDWICH PANEL UNDER AXIAL COMPRESSION

不锈钢芯板一字形墙是由两块不锈钢面板和正交均匀排布的不锈钢芯管组成的一字形截面构件,芯管与面板的连接采用铜钎焊焊接。主要研究不锈钢芯板一字形墙轴心受压时的承载能力,提出了其轴压承载力的计算公式。首先,进行了有限元特征值屈曲分析,得到了计算一字形墙弹性屈曲荷载及相应的正则化高宽比λn的算式;通过非线性有限元分析,对面板厚度、高宽比、芯管外径、芯管壁厚以及芯管分布间距等参数变化对不锈钢芯板一字形墙轴压承载力的影响进行分析,得到了轴心受压稳定系数φ,以及进行稳定设计的φ-λn曲线;设计了3组不锈钢芯板一字形墙试件,并对其轴压承载力进行了试验研究。试验结果、有限元分析结果和计算结果吻合较好,验证了不锈钢芯板一字形墙轴压承载力计算式的安全性。

The in-line wall of the structure of stainless steel sandwich panel is a cross-shaped member composed of two stainless steel panels and orthogonally arranged stainless steel core tube. The connection between the core tube and the panel is brazed by copper. In the paper,the bearing capacity of in-line wall of stainless steel sandwich panel under axial compression was studied,and the calculation formula of the bearing capacity under axial compression was proposed. Firstly,the finite element eigenvalue buckling analysis was carried out,and the formula for calculating the elastic buckling load of the wall and the corresponding regularized aspect ratio λn was obtained. Through the finite element non-linear analysis,the influence of the thickness of the panel,the aspect ratio,the outer diameter of the core tube,the wall thickness of the core tube and the distribution distance of the core tube on the bearing capacity of the axially compressed in-line wall of stainless steel sandwich panel was analyzed,and the stability coefficient φ of the axial compression was obtained,as well as φ-λn curve of stability by design;three sets of the in-line wall of specimens stainless steel sandwich panel were designed,and the axial compressive bearing capacity was tested. The test results,finite element analysis results and design formulas were in good agreement. The safety of the calculation formula for the axial compressive bearing capacity of the in-line wall of the structure of stainless steel sandwich panel were verified.