桁架式钢骨混凝土梁-钢筋混凝土柱节点抗震性能试验研究

Experimental research on seismic behavior of frame joints with steel reinforced concrete beam encased steel truss

为研究桁架式钢骨混凝土框架梁-钢筋混凝土柱连接节点的抗震性能,制作12个考虑钢骨含量、腹杆截面面积及轴压比三个变化参数的节点试件,对其进行低周反复荷载试验。试验观察了构件破坏过程,得到了节点梁端荷载-位移滞回曲线和骨架曲线以及各阶段的应变、荷载和位移值,并分析了节点的延性、能量耗散能力、抗剪性能。试验研究表明,该节点形式具有很好的延性和耗能能力,证明在节点区及梁端配有交叉腹杆的桁架式钢骨混凝土梁与钢筋混凝土柱节点连接方法是可靠的,节点能够有效传递弯矩和剪力。在试验研究的基础上建立了恢复力模型,模型和试验能够较好地吻合。研究成果可为工程实践提供参考。

To study the seismic behavior of joints with steel reinforced concrete（SRC） beam encased steel truss and reinforced concrete（RC） column,low-cyclic reversed loading tests were carried out on 12 SRC beam encased steel truss-RC column frame joints.The specimen were designed considering three factors,which were shape steel,angle and axial compression ratio.Failure process under low-cyclic reversed loading was observed,the load-displacement hysteretic loops,skeleton curves,strain and the load-displacement values were tested.Then the ductility,energy dissipation capacity,characteristics,shear property and proportion of function were analyzed.The experimental study indicates that the specimens have good ductility and good energy dissipation capacity.The experimental result indicates that the joints of beam configured with steel and crossed angel is effective,and the shear bearing capacity of core area of joints can be improved greatly.Based on the analysis of test data,the skeleton curves of restoring force model are built up and the model agrees with the test results well.The result can be useful reference to engineering practice.