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通过分析无焊接钢筋混凝土梁-钢管混凝土柱节点的受力特点以及失效模式,提出了三段式骨架曲线理论模型。对于弹性阶段,通过求解刚度矩阵方法获得节点骨架曲线的初始刚度;对于完全塑性阶段以及强度退化阶段,采用极限平衡方法获得节点的极限强度以及下降段刚度。为了进一步验证骨架曲线模型的正确性,将理论计算结果与有限元分析结果进行对比,说明三段式骨架曲线模型可以较好地描述节点的受力特性及承载能力变化趋势。
By analyzing the stress characteristics and failure modes of the welded-concrete-filled steel-reinforced concrete (CFST) beam-column joints, a three-section skeleton curve theoretical model is proposed. For the elastic phase, the initial stiffness of the node skeleton curve is obtained by solving the stiffness matrix method. For the complete plastic phase and the strength degradation phase, the limit equilibrium method is used to obtain the ultimate strength of the node and the descending section stiffness. In order to further verify the correctness of the skeleton curve model, the theoretical calculation results are compared with the results of the finite element analysis, which shows that the three-segment skeleton curve model can describe the stress characteristics and the changing trend of bearing capacity of the joints well.