方钢管混凝土柱穿芯螺栓-端板节点抗震性能试验研究

Experimental Studies on Seismic Behavior of Through Column Bolted End Plate Beam-To-Column Connections for Concrete-Filled Square Steel Tubular Columns

对三个穿芯螺栓—端板连接节点进行了伪静力试验研究,研究了不同轴压比时节点的滞回性能、强度和刚度退化、延性、耗能性能及破坏特征。结果表明,试件的层间位移延性系数为2.38-2.45,弹性及弹塑性层间位移角分别为0.0140-0.0158rad、0.0341-0.0377rad,能量耗散系数为2.567-3.820。所有节点试件均为梁端形成塑性铰而破坏,节点具有较好的强度、刚度、延性和耗能能力。提出了相关的设计及研究建议。

A total of three experimental specimens of through-column bolted end plate connections consisting of concrete-filled square steel tube column and H-shaped beams were tested under the low-cyclic reversed loading to research the hysteric behavior, the strength and stiffness degradation, the energy dissipation capacity and the failure modes. The only difference of all specimens is the axial compression ratio. Experimental results show that the story drift ductility ratios are 2.38 - 2.45, the elastic and elasto-plastic story angular drift are 0.0140 - 0.0158rad and 0.0341 -0.0377rad respectively, and the energy dissipation ratios are 2. 561 - 3. 820. The experimental results demonstrate that all specimens can develop plastic hinges at the end of beams and provided good seismic resistance in strength, stiffness, ductility and energy dissipation capacity, Additional a seismic design and research recommendations are presented.