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为研究退火处理及几何参数对矩形管节点滞回性能的影响,对2组Y形矩形管-管节点及2组Y形纵向板-矩形管节点进行了拟静力试验。每组包含2个几何尺寸相同的试件,对其中一个进行去应力退火处理。将节点弦管底面中部固定,对支管施加轴向往复荷载。试验中裂缝在节点的弦管上表面出现,沿弦管与连接件(支管或节点板)的连接焊缝外围发展并穿透弦管壁,导致节点失效。节点的耗能机制为弦管上表面塑性变形。分析发现:退火导致节点的极限承载力减小,延性比、累积延性比、累积能量耗散比增大;随支弦管夹角增大,管-管节点极限承载力、累积延性比、累积能量耗散比减小;随节点板长度增加,板-管节点的极限承载力、累积延性比、累积能量耗散比增大。
In order to study the influence of annealing treatment and geometric parameters on the hysteretic behavior of rectangular tube joints, two pseudo-static tests of two Y-shaped rectangular tube-tube joints and two Y-shaped longitudinal plate-rectangular tube joints were carried out. Each group contains two specimens of the same geometry, and one of them is subjected to stress relief annealing. Fix the center of the bottom of the chord of the node and exert axial reciprocating load on the branch pipe. In the experiment, the crack appeared on the upper surface of the chord of the node and developed along the periphery of the connecting weld between the chord and the connecting piece (branch pipe or nodal plate) and penetrated the chord wall, resulting in node failure. The energy dissipation mechanism of the node is the plastic deformation of the upper surface of the chord. The results show that the ultimate bearing capacity of the joint decreases with the increase of the ductility ratio, cumulative ductility ratio and cumulative energy dissipation ratio. With the increase of the included angle, the ultimate bearing capacity of the tube-tube joint, the cumulative ductility ratio, The energy dissipation ratio decreases. With the increase of the length of the joint plate, the ultimate bearing capacity, cumulative ductility ratio and cumulative energy dissipation ratio of the plate-tube joint increase.