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介绍了新型节点——在双钢管混凝土柱(CFTSTs)与钢筋混凝土梁(RC)之间使用间断套管的环梁节点。由于该节点处外钢管被打断,因此RC梁中纵向钢筋在连接区域能够连续。依靠连续钢筋传递弯矩和剪力;连接区内箍筋起到了限制作用,柱外侧的八角形环梁使受压区得到改善,补偿了外钢管不连续所引起组合柱刚度的减小。在循环荷载下对4个梁-柱组合试样进行试验,研究节点的抗震性能,包括:加载变形性能、典型破坏模式、应力应变分布、能量耗散能力。试验结果显示,节点的抗震性能较好,能够达到抗震设计准则中“强柱弱梁”和“强节点弱构件”的要求。采用有限元模型对相关参数进行分析。
A new type of node is introduced - a ring-beam node using interrupted sleeves between double-cored concrete columns (CFTSTs) and reinforced concrete beams (RC). Since the outer pipe at this node is interrupted, the longitudinal reinforcement in the RC beam can be continuous in the connection area. Relying on continuous steel bar to transmit bending moment and shear force, the stirrups in the connecting area play a limiting role. The octagonal ring beam on the outside of the column improves the pressure receiving area and compensates for the decrease of the rigidity of the combined column caused by the discontinuity of the external steel pipe. Four beam-column specimens were tested under cyclic loading to study the seismic behavior of the joints, including: loading deformation behavior, typical failure modes, stress-strain distribution and energy dissipation capacity. The test results show that the seismic performance of the joints is good, which can meet the requirements of “strong column weak beam” and “strong node weak component” in the seismic design criteria. The finite element model is used to analyze the relevant parameters.