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对钢管结构中常用的Y形矩形钢管节点进行了试验研究。通过对支管施加轴向往复荷载,共对10个直接焊接Y形矩形管节点进行拟静力试验。为研究钢管加工及节点焊接过程中产生的残余应力对节点性能的影响,对其中2个节点进行了去应力退火处理。通过分析节点的承载力、延性比和能量耗散系数,对此种节点的滞回性能进行了深入研究。试验表明:在支管承受轴向往复荷载作用时,总是在支弦管连接焊缝外边缘沿支管侧壁方向切断弦管上壁面,从而导致节点性能的劣化。在弦管上壁面拉裂之前节点耗能性能良好,且退火节点在弦管上壁面拉裂之后仍然有较大的耗能潜力。节点的滞回性能较好,这为在抗震区推广使用管结构提供了有力支持。
The Y-shaped rectangular steel pipe joints commonly used in the pipe structure were tested. By applying axial reciprocating load to the branch pipe, a total of ten directly welded Y-shaped rectangular pipe joints were subjected to quasi-static tests. In order to study the effect of residual stress on the joint performance during the process of steel pipe processing and node welding, two of them were stress-relief annealed. By analyzing the bearing capacity, ductility ratio and energy dissipation coefficient of the joint, the hysteretic behavior of such joint is studied in detail. Experiments show that when the branch pipe is subjected to axial reciprocating load, the upper wall surface of the chord pipe is always cut off along the side wall of the branch pipe at the outer edge of the pipe connecting weld, which leads to the deterioration of node performance. The energy dissipation performance of the node before the upper wall of the chordal pipe is cracked is good, and the annealing node still has greater energy dissipation potential after the upper wall of the chordal pipe is cracked. The hysteresis performance of the joints is better, which provides strong support for the popularization of the pipe structure in the earthquake zone.