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结合装配式节点和钢管混凝土(CFST)柱-钢筋混凝土(RC)梁节点各自优点,提出新型装配式套筒连接CFST柱-RC梁节点.为探讨该类节点抗震性能,对8个足尺劲性装配式套筒连接CFST柱-RC梁节点进行了低周往复荷载试验研究,考察了柱轴压比、梁柱连接角度(45°、90°)、梁柱位置(中间节点、边节点)对该类节点抗震性能的影响,对节点破坏形态、失效机制、滞回性能、骨架曲线、位移延性和耗能能力进行分析.采用ABAQUS程序建立节点的精细有限元模型,验证了其正确性.研究表明:该类节点具有“强钢管混凝土柱-弱钢筋混凝土梁”、“强节点-弱构件”的理想失效机制和较高承载力,试件加载至3~4.5倍屈服位移时因套筒位置附近纵筋拉断而破坏;节点耗能能力较强,变形能力较好,45°节点的平均位移延性系数>3,90°节点的平均位移延性系数>4.
Combining the merits of assembly nodes and CFST column-RC beam nodes, a new type of fabricated sleeve-connected CFST-RC beam nodes is proposed.In order to study the seismic performance of such nodes, Low-cycle cyclic loading tests were carried out on the CFST-RC beam joints with the sexually-assembled sleeve. The effects of axial compression ratio, beam-column connection angle (45 °, 90 °), beam and column position (middle node and edge node) The failure modes, the hysteretic behavior, the skeleton curve, the displacement ductility and the energy dissipation capacity of the joints are analyzed, and the ABAQUS program is used to establish the detailed finite element model of the joints to verify its correctness. The results show that this kind of joint has the ideal failure mechanism and higher bearing capacity of “CFST-weak-reinforced concrete beam”, “strong node-weak member”, and the specimen is loaded to 3 ~ 4.5 times of yield displacement When the longitudinal position of the sleeve is broken, the energy dissipation capacity of the joint is stronger and the deformation capacity is better. The average displacement ductility coefficient of 45 ° joints is> 3 and the average displacement ductility coefficient of joints is> 4.