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对冷弯薄壁型钢四肢拼合箱形截面立柱进行轴压和偏压试验研究,得到各试件的荷载-位移曲线和极限承载力,详细分析了试件的屈曲模式和破坏特征。建立了考虑材料、几何和接触非线性的有限元模型对试验试件进行模拟分析,两者吻合较好,验证了有限元方法的正确性。进而采用数值方法分析了构件长细比、螺钉间距和位置、偏心距和偏心方向对该类拼合立柱偏压受力性能的影响。结果表明:双向刀铰支座可以很好的实现铰接;螺钉间距为300mm时,拼合柱各肢整体协同工作性能良好;轴压和绕弱轴偏压试件最终破坏模式均为绕弱轴整体弯曲,绕强轴偏压时,试件破坏模式为弯扭失稳,但扭转不明显;拼合柱的偏压极限承载力和刚度随长细比和偏心距的增大而降低;偏心距相同时,拼合柱绕强轴偏压的极限承载力和刚度比绕弱轴偏压略高。
The axial compression and biasing tests were carried out on the four columns of cold-formed thin-walled steel box-sectioned box-section columns. The load-displacement curves and ultimate bearing capacities of the specimens were obtained. The buckling modes and failure characteristics of the specimens were analyzed in detail. A finite element model considering the material, geometry and contact nonlinearity was established to simulate the test specimen. The agreement between the two is in good agreement, which verifies the correctness of the finite element method. Furthermore, the influence of slenderness ratio, screw spacing and position, eccentricity and eccentricity direction on the biasing behavior of the split column is analyzed numerically. The results show that the two-way blade hinge supports can articulate well. When the screw spacing is 300mm, the overall workability of each column is good. The ultimate failure modes of both the axial compression and the uniaxial compression test are all around the weak axis Bending, bending around the strong axis, the specimen failure mode of bending and torsional instability, but the reverse is not obvious; the combined column of the ultimate bearing capacity and stiffness with the slenderness ratio and eccentricity increases and decreases; Eccentricity phase At the same time, the ultimate bearing capacity and stiffness of the split column around the strong axis are slightly higher than those around the weak axis.