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为深入了解圆钢管混凝土柱-钢筋混凝土环梁节点的抗震性能与传力机理,对4个空间内柱节点进行了双向低周反复加载试验。试验研究参数为环梁纵筋量与框架梁纵筋量的比值以及环梁配箍量。试验结果表明:环梁节点依靠环-柱相互作用传递外荷载;环梁沿圆周方向呈现出包含拉、弯、剪、扭的组合受力特征;环梁纵筋和箍筋的配置量对节点抗震性能影响较大。经过合理设计的钢管混凝土柱-环梁节点具有良好的延性,适合地震区的工程应用。
In order to deeply understand the seismic performance and transmission mechanism of the concrete filled circular steel tubular column-reinforced concrete ring beam, two-way low-cycle cyclic loading tests were carried out on the four columns. The experimental parameters are the ratio of the longitudinal reinforcement of the ring beam to the longitudinal reinforcement of the frame beam and the stirrup of the ring beam. The experimental results show that the ring beam nodes transmit the external loads by means of the ring-column interaction, the ring beam exhibits the combined force characteristics of the circle, the bending, the shearing and the torsion in the circumferential direction. Seismic performance impact. The properly designed concrete-filled steel tubular column-ring beam joints have good ductility and are suitable for engineering application in seismic areas.