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为了研究强节点系数对型钢混凝土(SRC)柱-混凝土(RC)梁混合节点破坏形态的影响,对6个SRC柱-RC梁混合节点开展低周反复荷载试验。通过调整梁端纵筋配筋率和节点箍筋配置以构造不同的强节点系数,实现SRC柱-RC梁混合节点梁端弯曲破坏、梁端弯曲-节点剪切破坏和节点剪切破坏3种不同的破坏模式。在试验研究基础上,考察该类混合节点的滞回曲线、骨架曲线和各受力阶段变形特性。研究结果表明,强节点系数是控制SRC柱-RC梁混合节点破坏形态的重要参数,强节点系数小于1.1时,一般发生节点剪切破坏,应通过合理设计加以避免;由于柱型钢穿越节点核心区,增强了对核心区混凝土的约束,使得SRC柱-RC梁混合节点发生节点剪切破坏后的受力性能优于RC节点;通过对试验数据的分析,提出SRC柱-RC梁框架结构满足四个抗震性能水平的位移角限值。
In order to study the effect of strong nodal coefficients on the failure morphology of SRC column-concrete (RC) beam hybrid joints, low-cycle cyclic loading tests on six SRC column-RC beam hybrid nodes were carried out. By adjusting the ratio of the longitudinal reinforcement and the stirrup of the node to construct different strong nodal coefficients, the bending failure of the beam-end of SRC-RC beam hybrid joint, the bending failure at the beam end, Destruction mode. Based on the experimental study, the hysteresis curve, the skeleton curve and the deformation characteristics of the hybrid nodes are investigated. The results show that the strong nodal coefficient is an important parameter to control the failure morphology of SRC-RC beam hybrid nodes. When the strong nodal coefficient is less than 1.1, the shear failure of nodal joints usually occurs and should be avoided by reasonable design. , So that the restraint of the concrete in the core area is enhanced, so that the mechanical behavior of the SRC column-RC beam hybrid joint is better than that of the RC node after shear failure. According to the experimental data, the SRC- Seismic performance level of the displacement angle limit.