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以轴压比为主要考察参数,对6个1∶1足尺模型的薄壁方钢管混凝土梁柱节点进行了单调加载试验。试验观察了受力过程和破坏形态,得到了梁端荷载-位移曲线,并分析了节点的刚度、承载力和延性等重要指标。结果表明,试件节点均经历了弹性、梁局部屈服、塑性、破坏等阶段,直焊型节点的破坏主要是由梁局部屈曲及柱棱角处拉裂引起,螺栓节点的破坏主要是由于梁与柱贴板间焊缝开裂引起,加腋节点中加腋板显著增强了节点域刚度,塑性铰形成于梁上并远离节点区域,其破坏主要由梁局部屈曲引起,节点域完好,较好地满足了“强柱弱梁、节点更强”的抗震设计目标;采用螺栓贯穿连接措施对节点初始刚度影响不大,而采用加腋手段对节点初始刚度提高显著;加腋和螺栓贯穿连接措施均能较大地提高节点的承载力;随着轴压比的增大,试件极限承载力有一定小幅降低,而试件延性下降明显。
Taking the axial compression ratio as the main parameter, six monolithically loaded concrete-filled square steel tubular beam-column joints were tested on six 1: 1 full-scale models. The process of loading and failure mode were observed and the load-displacement curve of beam end was obtained. The important indexes such as stiffness, bearing capacity and ductility of the joint were analyzed. The results show that all the specimens have experienced elastic, partial yielding, plastic deformation and failure of the beam. The failure of the welded joints is mainly caused by the local buckling of the beam and the cracking of the corner of the column. The failure of the bolt joints is mainly due to the failure of the beam Column welding seam between the cracks caused by the addition of axillary nodes with axillary significantly increased the node stiffness, the plastic hinge formed on the beam and away from the node area, the failure is mainly caused by the local buckling of the beam, the node domain intact, better The seismic design goal of “strong column and weak beam with stronger node ” is satisfied; the initial stiffness of the node is not affected by using the bolt penetration connection measures, but the initial stiffness of the node is increased obviously with the axillary approach; All the measures can greatly increase the bearing capacity of the joints. With the increase of the axial compression ratio, the ultimate bearing capacity of the specimens decreases slightly, but the ductility of the specimens decreases obviously.