矩形钢管混凝土柱-H形钢梁下栓上焊隔板贯通节点抗震性能试验研究

Experimental Study on the Seismic Behavior of the Bottom Flange Bolted and Top Flange Welded Diaphragm-Through Connection Between Rectangular CFST Column and H-shaped Steel Beam

为研究新型矩形钢管混凝土柱-H形钢梁下栓上焊隔板贯通节点的抗震性能,设计了槽孔型、圆孔型和焊接型下栓上焊隔板贯通节点足尺试件,通过进行低周往复加载试验,考察不同的腹板连接构造形式对下栓上焊隔板贯通节点抗震性能的影响,并针对各试件的破坏特征和承载力、刚度、延性及耗能能力等抗震性能指标进行了试验数据的分析。最后运用力学分析的方法对节点的抗弯能力进行了理论研究,并与试验结果进行了比较。结果表明,不同的腹板连接构造对节点的抗震承载力影响不大,但对节点的延性、刚度和耗能能力有较大影响;适当降低节点域的刚度有利于改善节点的耗能性能;螺栓滑移能提高节点的耗能能力,对刚度退化的影响不大;圆孔型和焊接型节点具有较好的延性和较高的刚度;理论推导得出的节点抗弯承载力与试验结果相差在10%左右,且计算结果偏于安全。

In order to study the seismic behavior of the bottom flange bolted and top flange welded diaphragm-through connection between rectangular concrete filled steel tubular(CFST)column and H-shaped steel beam,three full-scale specimens were tested under low-cycle reversed loading.The effects of different web connection configurations on the seismic behavior are investigated and the failure modes are compared.The theoretical calculation of the bearing capacity of joint is also conducted.Based on the tests,the indexes of behavior such as load-carrying capacity of the joints,rigidity degeneration,ductility and energy dissipation are obtained.It is shown that the type of web connection configuration does not have a significant influence on load-carrying capacity,while the influence is larger on rigidity,ductility and energy dissipation of the connections.Lower rigidity and bolt slip can lead to larger energy dissipation.Web connections of round opening and welding have greater ductility and rigidity.The difference between calculated loading capacity and test result is within 10percent and the calculating result is relatively safer.