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为研究预应力混凝土梁-钢骨变截面劲性柱节点的破坏特征及受力性能,进行了4个模型试件的低周反复荷载试验。观察了各节点的受力过程及破坏形态,并分析了试件的荷载-位移滞回曲线、骨架曲线、承载能力和延性等力学特性。结果表明:预应力混凝土梁-钢骨变截面劲性柱节点典型破坏形态是梁端弯剪破坏,该类节点的延性与混凝土梁柱节点相似,位移延性系数为2.0,柱内钢骨可提高节点的承载能力及刚度;柱内钢骨变截面可有效改善节点的延性性能,而对承载能力没有影响;节点处混凝土的浇筑质量对节点的整体受力性能影响较大。最后对该类节点给出了设计及施工建议。试验研究成果可为预应力混凝土梁-钢骨变截面劲性柱节点工程研究及应用提供参考。
In order to study the failure characteristics and mechanical properties of prestressed concrete beam-steel reinforced rigid column joints, 4 low-cycle cyclic loading tests were carried out. The stress process and failure mode of each node were observed. The load-displacement hysteresis curve, the skeleton curve, the bearing capacity and the ductility were also analyzed. The results show that the typical failure mode of the prestressed concrete beam-steel reinforced rigid column joints is the bending failure of the beam ends. The ductility of such joints is similar to that of the concrete beam-column joints. The displacement ductility coefficient is 2.0 and the inner steel bones can be increased And the bearing capacity and stiffness of the joint. The steel cross-section in the column can effectively improve the ductility of the joint without affecting the bearing capacity. The pouring quality of the concrete at the joint has a great influence on the overall mechanical performance of the joint. Finally, this type of node is given design and construction recommendations. The experimental results can provide reference for the research and application of prestressed concrete beam-steel cross-section stiffening column joints.