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为了对遭受火灾的型钢和钢筋混凝土框架结构的受力性能进行分析,建立了采用梁单元和考虑升降温过程影响的框架结构高温后受力性能分析方法。通过选择合理的火灾升温、降温以及受火后不同阶段材料的本构关系,采用在ABAQUS平台上开发材料子程序的方法实现了型钢和钢筋混凝土框架结构高温后受力性能的计算分析。利用该方法对钢筋混凝土框架高温反应试验、高温后型钢混凝土柱及型钢混凝土框架结构受力性能试验进行了模拟,其结果与试验结果基本吻合,验证了所提方法的合理性。
In order to analyze the mechanical properties of the steel and reinforced concrete frame structures subjected to fire, a method of analyzing the post-high-temperature stress behavior of the frame structure using beam elements and considering the influence of the rising and falling temperatures was established. By selecting reasonable fires’ heating, cooling and the constitutive relations of material at different stages after fire, the material subroutine developed on ABAQUS platform is used to calculate and analyze the stress behavior of steel and reinforced concrete frame structure after high temperature. The method was used to simulate the high temperature reaction of reinforced concrete frame, the behavior of steel reinforced concrete columns and steel reinforced concrete frame structures after high temperature. The results are in good agreement with the experimental results, which proves the rationality of the proposed method.