高强钢箱形轴压及偏压构件相关屈曲有限元模型的建立与验证

Buckling FEM modeling and verification for high-strength steel box section components under axial and eccentric compressions

综合考虑高强钢箱形轴压和偏压构件初始缺陷(整体、局部初弯曲)、残余应力以及几何、材料非线性的影响,采用有限元软件ANSYS建立有限元模型,并利用已有试验数据分析网格划分方式、初始缺陷施加形式等对有限元模型计算结果的影响。研究结果表明,采用残余应力文件进行两次导入,能获得较好的残余应力模拟效果;单元纵横比控制在1∶3之内时,能保证有限元模型得到较好的分析结果;基于本文分析所建立的有限元模型能很好地模拟相关构件。

Finite element software ANSYS was used to establish finite element models of high-strength steel box section components under axial and eccentric compressions,considering the member initial geometric imperfections（ the whole and local initial bending）,the residual stress and the influence of geometric and material nonlinear,and existing test data were used to analyze effects of mesh division mode and the initial defect loading form on the calculation results of finite element model. The research results show that using residual stress documents for twice imports can obtain better simulation effect of residual stress. Unit aspect ratio controlled within the range of 1 ∶ 3 can ensure good analysis results of the finite element model. Finite element analysis model established based on study can well simulate the related components.