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通过对锚栓生根、焊接生根、增大截面生根等三类共5个加层连接节点进行低周反复荷载作用下的足尺模型试验,对混凝土框架顶部直接加层钢结构连接节点的破坏形态、滞回曲线、位移延性、耗能能力等进行研究。试验结果表明:三类加层节点的破坏形态均为混凝土梁端受弯破坏,混凝土与钢结构之间的螺栓及焊缝连接性能良好,连接过渡钢板未出现明显变形;增大截面生根节点的滞回曲线较为饱满,抗震性能优于锚栓生根节点和焊接生根节点;锚栓生根节点和焊接生根节点的施工工艺相对简单,可操作性较强。
Full-scale model tests were carried out under three kinds of five kinds of additional connection nodes, such as rooting, welding rooting and increasing rooting of cross section, under the action of low cycle repeated loading. The failure modes of the joints , Hysteresis curve, displacement ductility, energy consumption and other research. The test results show that the failure modes of the three kinds of additional layer joints are all bent by the bending of the concrete beam end, the connection between the concrete and the steel structure is good, and the connection transition steel plate does not appear obvious deformation; The hysteresis curve is more full, the seismic performance is better than the anchor rooting and welding rooting nodes; the construction technology of the anchor rooting and the welding rooting is relatively simple and the maneuverability is strong.