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通过对X型相贯节点支管在轴压力、平面内弯矩、平面外弯矩共同作用下的极限承载力的试验研究,对节点加载过程中应力发展过程及位移变化进行分析。结果表明:通过对支管施加偏心荷载能够有效地模拟节点承受轴力、平面内弯矩、平面外弯矩的共同作用。节点区主管的局部屈曲是X型相贯节点的破坏模式。节点区主管部分区域在材料达到屈服强度前,应变已经呈现明显非线性。采用Eurocode 3中X型节点的承载力验算公式对支管承受轴力、平面内弯矩、平面外弯矩共同作用的X型相贯节点进行验算是可行的,验算表明节点是安全且偏保守的。
Through the experimental study on the ultimate bearing capacity of X-shaped tubular joints under axial pressure, in-plane bending moment and out-of-plane bending moment, the stress development process and displacement changes during node loading are analyzed. The results show that by applying eccentric load to the branch pipe, the joints can bear the joint action of axial force, in-plane bending moment and out-of-plane bending moment effectively. The local buckling of the nodal region is the failure mode of the X-shaped cross-node. In the area under the control of the node zone, the strain has shown a significant nonlinearity before the material reaches yield strength. It is feasible to check the X-shaped cross-joints of the branch pipe subjected to the axial force, the in-plane bending moment and the out-of-plane bending moment using the formula for bearing capacity test of X-type joints in Eurocode 3. The checking shows that the joints are safe and conservative .