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对4个梁端盖板加强-翼缘削弱型梁柱中节点试件进行低周反复荷载试验,主要研究节点域设置补强板和斜向加劲肋对高强钢节点的破坏模式、承载能力、转动能力、延性及耗能能力等的影响,并与ANSI/AISC 341-05推荐方法的计算结果进行对比,试验中,普通试件的破坏形式为节点域出现剪切塑性铰,节点域加强试件在翼缘削弱处发生明显塑性变形;经分析节点域贴焊的等厚补强板参与工作的程度为54%,斜加劲肋则为38%,从节点承载力来看,两者的加强效果相当;由于加载条件所限,各试件的延性和耗能能力并未达到预期的指标,但试件贴焊斜加劲肋后,转角延性系数降低约67%,节点域等效阻尼系数降低约38%,表明节点域加强后其转动能力及耗能能力急剧下降;对于高强度钢材,ANSI/AISC 341-05有关节点域抗剪承载力的计算规定偏于保守。
The low-cycle repeated loading tests were carried out on the four specimens of the strengthened-flange beam columns with lower end beams. The study mainly focused on the failure modes, the bearing capacity and the rotation capacity , Ductility and energy dissipation capacity, and compared with the results of the ANSI / AISC 341-05 recommended method. In the test, the damage form of the common specimen is that the shear plastic hinge appears in the node area, The flange weakening place obvious plastic deformation; the analysis of node spot welding plate thickness reinforcement plate to participate in the work of degree of 54%, inclined stiffener was 38%, from the node bearing capacity, the strengthening effect of the two are quite However, the ductility and energy dissipation capacity of the specimens did not reach the expected values due to the limited loading conditions. However, after the welded stiffeners were attached to the specimens, the ductility of the corners decreased by about 67% and the equivalent damping coefficient of the joints decreased by about 38% %, Indicating a sharp decline in turning ability and energy dissipation capacity when the node domain is strengthened. For high strength steels, the calculation requirements of ANSI / AISC 341-05 for the joint domain shear strength are somewhat conservative.