This paper presents an experimental investigation for evaluating the effects of fire exposure on the properties of structural elements retrofitted by fiber-reinforced polymers (FRPs). Mechanical properties of FRP-strengthened reinforced concrete (RC) members, protected with secondary insulation, were investigated, before and after (residual) direct fire exposure. Direct fire contact resulted in a reduction in the capacity of 9% to 20% for FRP-strengthened RC beams and 15% to 34% for FRP-strengthened RC columns. Furthermore, a similitude analysis was developed for a heat transfer relationship between full-scale and small-scale specimens, allowing a one-fourth exposure time reduction for the latter. Results from the experimental investigations demonstrated the benefits of employing secondary fire protection to FRP-strengthened structures, despite the glass transition temperature being exceeded in the early stages of the elevated-temperature exposure. Therefore, it is suggested that fire protection is necessary for an FRP-strengthened structure to retain integrity throughout the duration of the fire exposure and on return to ambient temperature. Retrofitting RC structures with adequate fire resistance by contributing to the missing information for fire protection requirements not available in codes of p. Apart from the test data, relations defining the variation of strength and elastic modulus of CFRP and GFRP with temperature are available in the literature. These relations are proposed by [8][9][10][11]33,35,39,40]; for FRP. The majority of these relations define the temperature-dependent variation in strength properties of CFRP, while relatively few relations define the variation in strength properties of GFRP. Additionally, most of these relations are in form of semi-empirical equations and express the variation of strength and stiffness of FRP up to 800 � C, whereas some relations are in the form of reduction factors providing percentage degradation in ambient temperature strength and stiffness of FRP at different temperature level. Saafi [40] proposed linear/bilinear relations for expressing degradation of strength and stiffness of GFRP and BFRP at elevated temperatures. These relations are based on the tests carried out on GFRP and BFRP rebars reported by Blontrock et al.