Based on maintaining the accuracy of existing models for circular specimens

revised models were proposed for predicting strength and ultimate strain of concrete columns confined with FRP with considering the effectiveness of confinement by crosssection. An evaluation of existing strength and ultimate strain models of concrete columns confined with FRP was presented with extensive collection of experimental data. It was shown that the prediction of strength was more accurate than that of ultimate strain

among which the prediction of Gampione’s strength model and Lorenzis’s ultimate strain model were more accurate for all specimens and circular specimens

respectively. The comparison with experimental results and existing models showed that the proposed models were more accurate

simpler and more convenient. The proposed models can be used for the prediction of strength and ductility in practical engineering.