梁通柱断式方钢管混凝土节点抗震性能试验研究

Study on the aseismic performance of concrete filled square steel tube joint with continual beam and discontinual column

研究梁通柱断式方钢管混凝土中节点在低周反复荷载作用下的受力性能和抗震性能.该种节点在节点区中断柱的外钢管,使钢筋混凝土梁的纵筋在节点直通.在节点区设置芯钢管、密排箍筋、竖向短筋连系上下钢管混凝土柱.通过2个缩尺模型试件的拟静力试验,得到节点试件的破坏过程、破坏形态、试件滞回曲线和试件各组成部分的荷载-应变关系.试验结果表明:该种节点在低周反复荷载作用下性能良好.试件破坏发生在梁根部,节点区尚有较大承载潜力,试件的耗能性能、位移延性良好.轴压比的增大对于承载力有提高作用,但耗能能力和位移延性有降低趋势.

The paper presents a study on the mechanical behavior and seismic performance of concrete filled square steeltube joint with continual beam and discontinual column. The outer steel tube of this kind of joint was partially broken offand the longitudinal steel bars in RC beams were continuous in the joint zone. The core steel, spaced stirrups and verticalshort bars tube were set in the joint core zone that can keep continuity of the steel tube. Through pseudo static test of twoscale model of the specimen, the load - strain relations of the destruction process of joint, failure modes and specimen hys-teresis curve of specimen is obtained. The test showed that this joint was in good condition under low reversed cyclic load-ing. The failure of specimens occurs in the roots of the beam and the joint area still have greater bearing potential and theenergy dissipation and ductility are in good condition. The increases o~ axial compression ratio may improve the capacity, but the energy dissipation capacity and ductility tended to decrease.