High temperature properties of fiber reinforced polymers and fire insulation for fire resistance modeling of strengthened concrete structures

Temperature dependent properties of materials are a crucial input for evaluating fire resistance of a structural member through calculation methods. While considerable amount of data is available on high temperature properties of concrete and reinforcing steel, only limited information is available on the temperature dependent properties of FRP and fire insulation. This paper reviews the currently available high temperature property test data and associated relations for FRP, and highlights the influence of different property relations on the fire resistance predictions of FRP-strengthened concrete structural members. Further, the influence of temperature dependent thermal properties of fire insulation on fire resistance prediction of FRP-strengthened member is also evaluated. Results from the analysis indicate that use of different property relations for FRP significantly alters the predicted fire response as well as the fire resistance of the strengthened concrete members. Results from the numerical studies further indicate that thermal properties of fire insulation have significant influence on fire resistance of FPR-strengthened RC members. Based on these numerical studies, recommendations are made for using appropriate property relations for FRP and fire insulation, in evaluating fire resistance of FRP-strengthened concrete members.