格构角钢立柱轴压试验及有限元分析

发布时间：2018-07-20 13:41

【摘要】：以组合墙体中的格构角钢立柱为对象,针对0.8mm,1.0mm,1.2mm,1.5mm,1.8mm 5种不同的厚度,通过轴压试验和有限元分析研究格构角钢立柱的轴压极限承载力和破坏模态,并进行对比。结果表明:同一厚度的3个格构角钢立柱试件,由于初始几何缺陷的不同,其轴压承载力、荷载-位移关系曲线有一定差别;由于对初始几何缺陷十分敏感,当厚度值较小时,3个试件的轴压载力相差较大,而当厚度较大时,3个试件的轴压承载力相差很小;由于绕弱轴方向的刚度和转动刚度都很低,格构角钢立柱基本发生的是绕弱轴弯曲失稳破坏,或同时伴随有立柱中部的局部扭曲或凸曲现象;格构角钢立柱通过有限元分析得到的荷载-轴向位移曲线和试验曲线走势一致,破坏模态基本相同,且极限承载力相符合较好,说明了文中提出的针对格构角钢立柱的有限元建模方法的正确性和合理性。
[Abstract]:Taking the lattice angle column in the composite wall as the object, the ultimate bearing capacity and failure mode of the lattice angle steel column are studied by axial compression test and finite element analysis, aiming at 5 different thickness of 0.8 mm ~ 1.0 mm ~ (1.2 mm) ~ 1.5 mm ~ (-1) mm ~ (1.8 mm), and compared with each other. The results show that the axial bearing capacity and load-displacement curves of three lattice angle column specimens of the same thickness are different due to the difference of initial geometric defects, and because of their sensitivity to initial geometric defects, When the thickness value is small, the axial ballast force of the three specimens differs greatly, but when the thickness is larger, the axial compression capacity of the three specimens is very small, because the stiffness and rotation stiffness around the weak axis are very low. The basic occurrence of lattice angle column is buckling failure around weak axis, or accompanied by local distortion or convexity in the middle of column. The load-axial displacement curve obtained by finite element analysis is consistent with the test curve, the failure mode is basically the same, and the ultimate bearing capacity is in good agreement. The correctness and rationality of the finite element modeling method proposed in this paper for lattice angle column are explained.
【作者单位】：武汉理工大学土木工程与建筑学院;
【基金】：湖北省科技厅项目(2014BAA122) 湖北省建设科技项目
【分类号】：TU398.9

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