Analysis of Finite Element Mechanism of Axial Compressive Behavior of T-Shaped Stiffened Concrete-Filled Steel Tubular Stub Columns After Uniform Fire Exposure

다국어 초록 (Multilingual Abstract)

Based on the reasonable determination of material constitutive relationship and interaction model between concrete and steel tube, a fi nite element model of T-shaped stiff ened concrete-fi lled steel tube (TSCFST) stub column exposed to uniform fi re was established, and model reliability was verifi ed. 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 eff ects 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 fi re exposure.

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