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为了研究轴压下钢管混凝土圆柱的耐火性能,建立了非线性有限元三维模型。针对文献中的一系列柱,进行了更符合实际的分析:先进行温度场分析,再进行应力场分析的耦合非线性分析。通过模拟结果和耐火试验的对比,验证了模型的有效性。进行了有限元模型中大量参数的敏感性分析,包含以往从未涉及的参数。基于该分析,提出了一些有益于后续工作的建议。利用此数值模型,深入研究和探讨欧洲钢-混组合结构耐火设计规范中的简化计算模型。
In order to study the fire resistance of concrete filled steel tubular columns under axial compression, a three-dimensional nonlinear finite element model was established. For a series of columns in the literature, a more realistic analysis was carried out: a coupled nonlinear analysis of temperature field and stress field analysis was performed first. The validity of the model is verified by comparing the simulation results with the fire test. Sensitivity analysis of a large number of parameters in the finite element model was performed, including parameters that were never involved in the past. Based on this analysis, some suggestions for follow-up work have been put forward. Using this numerical model, the simplified calculation model in the fire-resistant design code of European steel-concrete composite structure is deeply studied and explored.