Y形直接焊接矩形钢管节点滞回性能试验研究  

Experimental research on hysteretic behavior of Y-type RHS joints

作　　者：武振宇[1] 张扬[1] 何小辉[1] 姚永红[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2010年第8期63-70,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(50978076);地震行业科研专项经费项目(2008419073)

摘　　要：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。Y-type RHS joints commonly used in tubular structures were investigated by experimental method. Quasistatic experiments of ten joints were carried out under cyclic axial load applied on the brace. In order to analyze the influence of residual stress produced by tube production and joint welding, two joints were annealed. Some indexes including bearing capacity, ductility ratio and energy dissipation coefficient were analyzed to investigate hysteretic behavior of these joints. It was found that the upper surface of the chord was always laniated along the side walls of the brace width on the outer edge of the weld toe between the brace and the chord under cyclic axial loading, which caused the deterioration of the joint capacity. The energy dissipation capacity was good before the upper surface of the chord cracked. The annealed joints still had considerable energy dissipation potential after the chord surface cracked. The joint hysteretic behavior was found to be satisfactory, which provided strong support to the engineering application of tubular structures in seismic area.

关 键 词：Y形矩形钢管节点 拟静力试验 滞回曲线 耗能性能 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1