Based on the reasonable determination of material constitutive relationship and interaction model between concrete and steel tube, a finite element model of T-shaped stiffened concrete-filled steel tube (TSCFST) stub column exposed to uniform fire was established, and model reliability was verified. Through the FE model, the working mechanism of the model in the whole process of loading was analyzed in detail. In the process of axial compression, the load distributions of steel tube and concrete, and the interaction between steel tube and concrete were discussed. This paper analyzed the effects of the main factors on residual bearing capacity of TSCFST stub columns, and put forward the calculation formula of the residual bearing capacity of TSCFST stub columns after uniform fire exposure.

在合理确定混凝土与钢管之间的材料本构关系和相互作用模型的基础上，建立了均匀受火的T形加筋钢管（TSCFST）短柱的有限元模型，并验证了模型的可靠性。通过有限元模型，详细分析了模型在整个加载过程中的工作机理。在轴向压缩过程中，讨论了钢管和混凝土的载荷分布，以及钢管与混凝土之间的相互作用。分析了主要因素对TSCFST短管柱残余承载力的影响，提出了均匀受火后TSCFST短管柱残余承载力的计算公式。