复式钢管混凝土柱与H形钢梁连接节点抗震性能试验研究

借鉴方钢管混凝土柱-钢梁外肋环板节点形式，将非梁柱连接面的柱两侧外肋环板改为竖贴于柱侧的竖向肋板并伸出与梁翼缘焊接，同时设置锚固腹板，形成复式钢管混凝土柱与H形钢梁连接节点。通过7个梁柱组合体试件的低周反复荷载试验，分析各试件的破坏过程及特征，并对试件的滞回性能、承载力、延性、耗能能力和承载力及刚度退化等抗震性能进行研究。研究结果表明：节点的破坏形态基本相同，梁端先屈曲，形成塑性铰；锚固腹板可有效提高节点的承载力和变形能力；竖向肋板外伸长度可提高试件的初始刚度，使梁端塑性铰外移，有效保护节点核心区；试件的滞回曲线呈明显的梭形，具有良好的承载力、延性及耗能能力；试件在整个加载过程中刚度退化现象明显，承载力退化很小，可应用于抗震设防地区。

Experimental study on seismic behavior of connection between composite CFST column and H-shaped steel beam

Learned from the vertical stiffener joint of square concrete filled steel tube(CFST) column, one new connection between composite CFST column and H-shaped steel beam was studied by test. This connection consists of vertical stiffeners connecting the beam flange to the column flange, meanwhile anchorage plate is groove welded on inner steel tube, coming through the outer steel tube, and welded and bolted connected with the steel beam web. Seven joint specimens were tested under cyclic loads to investigate the seismic behavior of composite connections. Based on the experiments，the failure process and feature of each specimen were described and hysteretic loops，load-carrying capacity，ductility，stiffness degradation，strength degradation and energy dissipation capacity, etc., were studied. The results show that failure modes of the tested specimens are basically the same: steel of the horizontal end plate yields first and plastic hinges form afterwards; the connections with ribbed anchorage plate can reach a higher load-bearing and deformation capacity than the connections without ribs；the extension of the vertical stiffener can improve the initial stiffness of the joint，and it is also effective in moving the buckling zone away from the joint zone. The hysteretic characteristics of the connections is stable and the energy dissipation capacity，strength and ductility are sufficient. In the whole loading process，the stiffness degradation is obvious and bearing capacity degradation is slow，so the seismic performance of the proposed new type of connection is adequate to be applied in seismic areas.