Abstract

The increased compressive strength of concrete cylindrical specimens reinforced with FRP composite fibers significantly reduces seismic risk. Due to the fact that in concrete structures, compressive strength is different from design strength, it is therefore necessary to use new retrofitting techniques. The present study aimed to obtain compressive strength of FRP cylindrical specimens and confinement effect. To this end, data obtained from 107 concrete cylindrical specimens reinforced with FRP were analyzed in Genxpro software to estimate compressive strength of FRP-reinforced concrete using genetic programming. 75% and 25% of data were used as training and testing sets, respectively. Then specimen diameter, FRP layer thickness, ultimate tensile strength, and ultimate unconfined strength were introduced into the software as input. After entering data into the software, checking database for being used in the estimation model, controlling settings of chromosome architecture for model construction, and assessment of fit functions, various equations were obtained for compressive strength of FRP-reinforced concrete. The results showed high correlation between actual values and the values estimated by genetic programming.