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为研究方钢管混凝土柱节点的受剪屈服问题,建立了方钢管混凝土柱节点抗剪受力模型。该模型在试验的基础上,将方钢管混凝土柱节点抗剪受力过程分为协同工作、共同工作、屈服强化和极限变形4个阶段,抗剪受力由钢管腹板和节点核心区混凝土共同承担,其中核心区混凝土又以平面抗剪和压杆模式分别对抗剪承载力作出贡献。综合考虑这三者的作用,该模型与试验结果吻合较好。使用该模型可对方钢管混凝土柱节点的受剪和变形等性能进行分析研究。
In order to study the shear yielding of concrete filled square steel tubular column joints, a shear stress model of concrete filled square steel tubular columns is established. Based on the experiment, the model divides the process of shear strength of square concrete filled steel tubular column into 4 stages: joint work, joint work, yield reinforcement and ultimate deformation. The shear stress is controlled by the steel pipe web and the core area of concrete Commitment, of which the core area of concrete and plane shear and pressure bar models respectively contribute to the shear capacity. Considering the effects of these three factors, the model is in good agreement with the experimental results. The model can be used to analyze the properties of concrete-filled steel tubular columns such as shear and deformation.