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基于ABAQUS软件进行了外包钢管约束加固火灾后钢筋混凝土柱力学性能的数值模拟,分别建立了受火钢筋混凝土构件的温度场分析模型及加固后构件的三维单元力学分析模型。探讨了钢管屈服强度、名义含钢率、新修复混凝土强度等对外包钢管约束加固火灾后钢筋混凝土柱承载力、刚度及延性的影响规律。结果表明:火灾后钢筋混凝土柱的承载力和刚度都会明显降低,采用外包钢管可对受损伤的钢筋混凝土柱进行修复加固,加固后组合柱受力性能将得到大大改善。分析结果可为有关工程应用提供参考。
Based on the ABAQUS software, the numerical simulation of the mechanical behavior of RC columns strengthened with steel tube wrapped confined by fire was carried out. The temperature field analysis model of reinforced concrete members subjected to fire and the three-dimensional elemental mechanical analysis model of the strengthened components were established respectively. The effects of steel tube yield strength, nominal steel ratio and newly repaired concrete strength on the bearing capacity, stiffness and ductility of reinforced concrete columns after the steel tube is restrained and fire strengthened are discussed. The results show that the bearing capacity and stiffness of reinforced concrete columns will be significantly reduced after fire, and the damaged steel reinforced concrete columns can be repaired and strengthened by using the steel tube. The mechanical properties of the composite columns will be greatly improved. The results of the analysis can provide reference for engineering application.