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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。
The structural angle steel columns in the composite wall are taken as the object. According to the different thickness of 0.8mm, 1.0mm, 1.2mm, 1.5mm and 1.8mm, the axial compression of the lattice angle column is studied by the axial compression test and finite element analysis Ultimate bearing capacity and failure mode, and compared. The results show that the axial load capacity and the load-displacement relation curves of three lattice columns with the same thickness have some differences due to the initial geometric defects. Due to the sensitivity to the initial geometric defects, when the thickness value is small , The axial compressive forces of the three specimens are quite different, while when the thickness is large, the axial compressive bearing capacity of the three specimens is very small; because of the low stiffness and rotational stiffness around the weak axis, The angle steel column basically takes place around the weak axis bending instability damage, or at the same time accompanied by partial distortion or convex curvature of the central column; load-axial displacement curve obtained by finite element analysis of the lattice angle column and the trend of the test curve are consistent, The failure modes are basically the same and the ultimate bearing capacity is in good agreement, which shows the correctness and rationality of the finite element modeling method proposed in this paper.