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为研究矩形钢管混凝土异形柱-钢梁框架节点的破坏特征和抗震性能,进行了5个中节点、2个边节点和2个角节点的低周反复加载试验。观察了节点的受力过程及破坏形态,分析了试件的荷载-位移滞回曲线、承载能力、强度和刚度退化、层间位移角和延性以及耗能能力等力学特性。结果表明:矩形钢管混凝土异形柱-钢梁框架节点的典型破坏形态是节点域腹板的剪切破坏、节点核心区腹板与柱翼缘连接的竖向焊缝断裂;试件滞回曲线饱满,层间位移延性系数介于1.44～2.74,弹塑性极限层间位移角约为1/43～1/21;等效黏滞阻尼系数介于0.227～0.316,表明节点域的变形和耗能能力较强。当柱截面肢高肢厚比为3、4时,破坏时节点核心区的剪切角约为0.01～0.03;当柱截面肢高肢厚比为2时,破坏时节点核心区的剪切角约为0.08～0.10。
In order to study the failure characteristics and seismic performance of the concrete-filled rectangular steel tube columns with special-shaped column-steel beam, five medium nodes, two side nodes and two corner nodes were tested under low cyclic loading. The stress process and failure mode of the joints were observed. The load-displacement hysteresis curves, bearing capacity, strength and stiffness degradation, interlayer drift angle, ductility and energy dissipation were analyzed. The results show that the typical failure mode of the CFST special-shaped column-steel beam frame joints is the shear failure of the webs in the joints, and the vertical welds connecting the web flanges with the flanges in the core zone of the joints are ruptured. , The interlayer displacement ductility coefficient is between 1.44 and 2.74, the elastic-plastic ultimate displacement angle is about 1 / 43-1 / 21, and the equivalent viscous damping coefficient is 0.227-0.316, indicating that the deformation and energy dissipation capacity Strong. When the height-to-thickness ratio of the column cross-section limbs is 3, 4, the shear angle at the core of the node is about 0.01-0.03. When the limb height-height ratio of the column section is 2, the shear angle About 0.08 ~ 0.10.