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基于已有研究成果,建立具有较高精度的单孔薄壁闭口截面组合梁的改进结构力学模型。该模型考虑了轴向翘曲和材料各向异性对壳壁中心表面剪应变的影响。根据壳壁的一般本构关系直接计算得到剪应变,给出一维整体梁刚度矩阵的封闭表达式。采用ABAQUS软件对不同荷载条件下不同薄壁接头的箱形和圆柱形梁进行了数值模拟及对比分析。表明:材料各向异性对壳壁中心表面剪应变的影响对模型的精确性有着显著影响,而轴向翘曲的影响可以忽略不计。揭示出一些现有模型的显著缺陷。
Based on the existing research results, an improved structural mechanics model of single-hole thin-walled closed-section composite beam with high precision is established. The model considers the influence of axial warpage and material anisotropy on the shear strain at the center of the shell wall. According to the general constitutive relation of the shell wall, the shear strain is directly calculated, and the closed expression of the one-dimensional integral stiffness matrix is given. ABAQUS software was used to simulate and analyze the box-shaped and cylindrical beams with different thin-walled joints under different loading conditions. It is shown that the influence of material anisotropy on the shear strain of the center of the shell wall has a significant effect on the accuracy of the model, while the influence of axial warpage can be neglected. Reveal significant shortcomings of some existing models.