Analytical Model for Steel Fibre-Reinforced Concrete-Filled Tubular Columns Exposed to Fire



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Submitted Dec 27, 2022
Published Feb 17, 2023
10.24018/ejeng.2023.8.1.2966

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This study proposes an analytical model for the evaluation of the mechanical behaviour of circular hollow section columns infilled with steel fibre-reinforced concrete when exposed to elevated temperatures in a fire situation. This work includes the discussion of the results from a sensitivity analysis conducted through numerical simulation and the development of an analytical model based on the prEN1994-1-2:2021 European standard for the design of reinforced concrete structures exposed to fire. The sensitivity analysis aims to compare the fire resistance of centrally and eccentrically loaded circular hollow section columns infilled with plain and steel fibre-reinforced concrete. The proposed analytical model for determining the design buckling load of composite steel fibre-reinforced concrete-filled tube columns in a fire situation is ready to serve as an annexe or supplementary technical document to the EN1994-1-2:202x standard.

Keywords: Analytical Model Concrete-Filled Steel Tubes Circular Hollow Section Fire Resistance Sensitivity Analysis Steel Fibre-Reinforced Concrete

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