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基于大型有限元分析软件ABAQUS,研究在低周反复荷载作用下新型钢管混凝土结构节点——方钢管混凝土柱与钢梁的穿筋节点的力学性能,并将计算值与试验值进行对比,验证非线性分析方法的有效性。建立同时考虑几何非线性、材料非线性的有限元分析模型,分析在低周往复荷载下该节点的破坏模式、承载力、延性及耗能能力等。计算值与试验值吻合度较高,验证了有限元分析模型的准确性,并进一步分析了该节点的力学性能。计算结果发现滞回曲线饱满,位移延性系数理论值介于3.79~4.91,耗能比理论值均大于0.9。新型穿筋节点传力路径明确,延性及耗能能力较好,有限元分析模型能够较好地模拟该节点的力学性能,为进一步研究和改善该节点提供更方便、经济的方法。
Based on the large-scale finite element analysis software ABAQUS, the mechanical properties of the new reinforced concrete filled steel tubular column-reinforced concrete (CFST) column and steel beam under the action of low cycle repeated loading are studied. The calculated values are compared with the experimental values. Validity of linear analysis methods. A finite element analysis model considering both geometrical nonlinearity and material nonlinearity is established, and the failure mode, bearing capacity, ductility and energy dissipation capacity of the joint at low cyclic reciprocating loads are analyzed. The calculated value is in good agreement with the experimental value, which verifies the accuracy of the finite element analysis model and further analyzes the mechanical properties of the node. The calculated results show that the hysteretic curve is full, the theoretical value of displacement ductility coefficient is between 3.79 and 4.91, and the energy dissipation ratio is more than 0.9. The new pass-through node has a clear path of force transmission, good ductility and energy dissipation capability. The finite element analysis model can simulate the mechanical properties of the node well and provide a more convenient and economical method for further research and improvement of the node.