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通过静力加载试验及ABAQUS非线性有限元分析来研究T形钢管混凝土组合柱-钢筋混凝土梁外伸端板连接节点力学性能。结果表明:节点剪力主要由核心区形成的斜压杆来承担,而牛腿腹板承担的比例较小;设置加劲肋可有效抑制端板翘曲变形,缓解节点区应力集中,比增加端板厚度更能有效提高节点抗弯承载力;轴压比小于0.4时,增大轴压比节点抗弯承载力略有提高,轴压比大于0.4时,增大轴压比节点抗弯承载力稍有降低,但提高、降低的幅值均很小;梁柱线刚度比对节点抗弯承载力影响较小;提高框架梁混凝土强度等级,节点抗弯承载力相应有所提高;提高框架梁配筋率,节点抗弯承载力明显增大,但当配筋率超过1.8%后继续提高时,节点抗弯承载力提高的幅值较小;有限元计算骨架曲线与试验结果能较好吻合,验证了有限元模型的合理性。
Through the static loading test and ABAQUS nonlinear finite element analysis, the mechanical properties of the connecting joints of the T-shaped CFST columns and the outrigger beams are studied. The results show that the node shear force is mainly borne by the camshafts formed in the core region, while the ratio of the cowhide webs is small. The stiffener can effectively suppress the warpage of the end plates and relieve the stress concentration in the node region, When the axial compression ratio is less than 0.4, the flexural strength of the joint increases slightly, while the axial compression ratio increases more than 0.4, the flexural strength of the joint increases But the increasing and decreasing amplitude are very small; the stiffness ratio of beam and column has less influence on the flexural capacity of the joint; and the flexural strength of the beam increases with the increase of the concrete strength of the frame beam; The rate of reinforcement and the flexural capacity of joints increased obviously. However, when the rate of reinforcement increased more than 1.8%, the increase of flexural capacity of joints was smaller. The calculated results of the skeleton curves were in good agreement with the experimental ones , Verify the rationality of the finite element model.