基于多线性材料硬化的向量式有限元C型薄壁型钢屈曲分析OA北大核心CSTPCD

C-shaped thin-walled steel is quite common in practical engineering and is prone to buckling failure under the action of force.The traditional finite element method has a mature scheme for predicting structural buckling,but the proce-dure is complicated.Based on the vector form intrinsic finite element(VFIFE)method,a Fortran calculation program for triangular shell element is developed.The pre-processing and post-processing programs are written in Matlab,and the cal-culation results are compared with those of classical hyperbolic shell buckling to check their correctness.Considering geo-metric non-linearity and material non-linearity,a multi-linear material hardening model is introduced to calculate the buck-ling characteristics of C-type thin-walled steel with different sizes under axial load.The buckling load is determined by the displace axial force curve,and the deformation after buckling is plotted by the post-processing program and compared with the existing test results.The results show that the VFIFE method with multi-linear material hardening model can predict the buckling load and buckling mode of the structure well,which provides a new and reliable reference for predicting the buck-ling behavior of the structure.