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通过30根由双肢C形和[形冷弯薄壁型钢拼合箱形柱的轴压和偏压试验,得到了试件的荷载-位移曲线和最大荷载,并分析了其屈曲模式和破坏特征。采用ABAQUS程序对拼合截面柱受压性能进行了有限元分析,分析参数主要包括长细比、腹板高厚比、截面高宽比、偏心距与偏心方向等。结果表明:轴压中、长柱系列试件的破坏模式为绕弱轴整体弯曲破坏,轴压短柱系列试件为局部屈曲变形过大而导致的塑性折曲,绕强轴和绕弱轴的偏压试件最终分别为整体弯扭屈曲和整体弯曲破坏;试件的最大轴压荷载及刚度均随着试件长细比的增大而逐渐减小;试件最大轴压荷载随腹板高厚比的增大而减小;试件的截面高宽比较大,绕两个主轴的长细比会相差较大,通过增加翼缘宽度以增大拼合柱绕强轴和弱轴的稳定性,显著提高其最大荷载;偏压拼合柱的最大荷载随着偏心距的增加而降低。
The load-displacement curves and the maximum loads of 30 specimens with double-limb C-shape and [Cold-formed thin-walled steel composite box columns were obtained, and their buckling modes and failure characteristics were analyzed. The ABAQUS program was used to analyze the compressive behavior of the composite section column. The analysis parameters mainly include the slenderness ratio, the ratio of web height to thickness, aspect ratio, eccentricity and eccentricity. The results show that the failure mode of the middle and long columns of specimens under axial compression is the total bending failure around the weak shaft, and the specimens under axial compression are mainly caused by the plastic buckling caused by the local buckling deformation. The ultimate bending and torsional buckling and the total bending failure of the specimens were respectively tested. The maximum axial compressive load and stiffness of the specimen decreased with the increase of the slenderness ratio of the specimen. The maximum axial compressive load The ratio of thickness to thickness is larger and smaller; the cross section of the specimen is larger, the slenderness ratio of the two main axes will be quite different, and the width of the flange is increased to increase the size of the split column around the strong axis and the weak axis Stability and significantly increase its maximum load; the maximum load of the biased splitting column decreases with the increase of eccentricity.