基于向量式有限元的空间格构柱屈曲破坏

基于向量式有限元法对空间格构柱受载荷下的屈曲行为进行数值分析，编制屈曲分析的数值计算程序，通过屈曲平衡路径追踪获得失稳临界载荷，探讨不同加载控制方法对计算结果的影响。考虑材料非线性的影响，对5层空间格构柱的载荷屈曲过程进行分析，获得载荷 位移全过程曲线，并与格构柱的加载破坏试验进行对比，结果表明：向量式有限元采用位移控制法能够较好地分析空间格构柱的屈曲失稳破坏过程，获取准确的极限稳定承载力。

Buckling failure of spatial lattice columns based on vector form intrinsic finite element method

Based on the vector form intrinsic finite element method, the buckling behaviors of spatial lattice columns under loads are analyzed numerically, and the computing program for buckling analysis is developed, and then the buckling equilibrium path is tracked to obtain critical load of instability. The effects of different load control methods on computed results are discussed. On considering the effects of the material nonlinearity, the buckling process of 5 layer spatial lattice column is analyzed, and the load displacement curve of the whole buckling process is obtained. The computed results are compared with the experiment data, and it shows that the displacement controlling mode of vector form intrinsic finite element method is more suitable for analyzing the structural buckling of spatial lattice column. The ultimate stability bearing capacity of the column can be obtained accurately.