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通过对方钢管混凝土中柱的“十字形”节点、边柱的“T形”节点、角柱的“L形”节点3根试件在低周反复加载的实验,分析节点的破坏机理,比较三种节点的力学性能。结果表明:试件在钢梁翼缘与侧板连接的角隅处产生应力集中现象,导致节点最终发生破坏;L形节点比十字形和T形节点要提前达到屈服,但其极限承载力介于两者之间;三种节点滞回曲线均比较饱满,具有良好的耗能能力,节点的延性均较好。运用ABAQUS6.5对试件在低周反复荷载作用下进行非线性模拟计算,并分析轴压比对节点承载力的影响。结果表明:分析得到的结果与实验结果吻合良好;当轴压比增大时,节点的承载能力降低。
Through the experiment of 3 specimens of “C”, “T” and “L” of the column in the concrete filled steel tubular, Damage mechanism, compare the mechanical properties of three kinds of nodes. The results show that the stress concentration phenomenon occurs at the corner where the steel flange connects with the side plate, resulting in the ultimate failure of the joint. The L-shaped joint reaches the yield earlier than the cruciform and T-shaped joints but its ultimate bearing capacity is between two The hysteresis curves of the three kinds of nodes are all full, with good energy dissipation ability, and the ductility of the nodes is better. ABAQUS6.5 was used to conduct nonlinear simulation of the specimen under low cyclic loading, and the effect of axial compression ratio on the bearing capacity of the joint was analyzed. The results show that the calculated results are in good agreement with the experimental results. When the axial compression ratio increases, the bearing capacity of the joints decreases.