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以斜交网格X型节点为原型,采用ABAQUS数值分析软件建立模型,对其进行轴向拉压往复荷载作用下的非线性分析。分析了在加载过程中节点的钢部件和混凝土的应力分布情况,并研究了节点的荷载-位移滞回特性及刚度退化。同时,以节点相贯角度、竖向连接板厚度、衬板厚度、钢管宽厚比、加强环厚度、混凝土强度等级为控制参数,分析其对X型节点轴向性能的影响。研究表明:采用竖向连接板、衬板和加强环可以改善节点区混凝土的约束效果,节点滞回曲线饱满,初始刚度较大,且刚度退化较慢,表现出良好的抗震性能。竖向连接板厚度、钢管宽厚比和混凝土强度等级对节点极限承载力、滞回性能以及刚度退化影响较大,而节点相贯角度、衬板和加强环厚度对节点极限承载力、滞回性能以及刚度退化影响较小。
The skew grid X-node is taken as the prototype, and the ABAQUS numerical analysis software is used to establish the model. The nonlinear analysis is carried out under axial tension and compression load. The stress distributions of the steel components and concrete during the loading process are analyzed. The load-displacement hysteretic behavior and stiffness degradation of the joint are studied. At the same time, the influence of joint angle, vertical connecting plate thickness, lining thickness, steel pipe width to thickness ratio, reinforced ring thickness and concrete strength grade as control parameters were analyzed. The results show that the vertical connecting plate, lining plate and stiffener ring can improve the restraining effect of concrete in the node area. The hysteresis curve of the node is full, the initial stiffness is large, and the stiffness degeneration is slow, which shows the good seismic performance. The thickness of vertical connecting plate, the ratio of steel pipe width to thickness and the strength of concrete have a greater influence on the ultimate bearing capacity, hysteretic behavior and stiffness degradation of the joints, but the joint angles, the thickness of the linings and stiffeners have no significant effect on the ultimate bearing capacity, hysteretic behavior As well as less effect of stiffness degradation.