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基于柔度法和纤维模型的基本思想,应用Opensees软件,对梁柱单元应用于钢管混凝土柱的建模方法进行研究,在此基础上,对单元参数进行分析,探讨材料本构关系、纤维截面网格划分、积分点数量等参数对模拟精度及计算效率的影响。通过与试验对比,结果表明,受约束混凝土本构关系的下降段和钢材本构关系的强化段是影响单元准确性的主要因素,而网格划分和积分点数量的影响则主要体现在计算效率方面。研究将为基于柔度法的纤维梁柱单元在组合结构中的应用提供依据。
Based on the basic idea of flexibility method and fiber model, Opensees software was used to study the modeling method of beam-column element applied to concrete-filled steel tubular column. Based on this, the element parameters were analyzed to explore the relationship between material constitutive relation, fiber cross section The impact of grid parameters, the number of integration points and other parameters on simulation accuracy and computational efficiency. Compared with the experimental results, the results show that the reinforced section of the constitutive relationship between the confined concrete and the strengthened section of the steel constitutive relationship are the main factors that affect the accuracy of the unit. The influence of the number of mesh points and integration points is mainly reflected in the computational efficiency aspect. The research will provide the basis for the application of the fiber beam-column unit in the composite structure based on the flexibility method.