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为研究圆钢管钢筋混凝土轴压短柱火灾后剩余承载力,在标准升降温全过程曲线作用下,进行了在核心混凝土中配置纵向受力钢筋的6根圆钢管钢筋混凝土短柱的明火试验;基于ABAQUS有限元分析软件建立了钢管钢筋混凝土轴压短柱温度场和火灾后力学场分析模型,模型分析结果与试验结果吻合较好,并利用该模型对影响圆钢管钢筋混凝土轴压短柱火灾后剩余承载力的主要参数进行分析。试验结果表明:钢管钢筋混凝土短柱受火后仍具有较高的承载力;升温时间和构件的截面尺寸是影响圆钢管钢筋混凝土轴压短柱火灾后剩余承载力的主要因素;基于常用范围内参数提出圆钢管钢筋混凝土短柱火灾后剩余承载力的实用计算式,可为实际工程中该类构件的火灾后加固提供参考。
In order to study the residual bearing capacity of round steel tube reinforced concrete axially compressed short columns after fire, an open flame test of 6 circular steel tube reinforced concrete short columns with longitudinally stressed steel bars in the core concrete was carried out under the full process curve of standard heating and cooling. Based on ABAQUS finite element analysis software, the temperature field and post-fire mechanics field analysis models for steel tube reinforced concrete axially compressed short columns were established. The model analysis results are in good agreement with the experimental results. This model is used to affect the impact of round steel tube reinforced concrete axial short column fires. The main parameters of the remaining bearing capacity are analyzed. The test results show that the steel-reinforced concrete short columns still have high bearing capacity after being exposed to fire; the temperature rising time and the cross-sectional dimensions of the components are the main factors that affect the residual bearing capacity of the round steel tube reinforced concrete axially compressed short columns after fire; based on the common range The parameter proposes a practical calculation formula for the residual bearing capacity of round steel tube reinforced concrete short columns after fire, which can provide reference for the post-fire reinforcement of such components in practical projects.