Analysis of concrete beams prestressed and post-tensioned with carbon fiber reinforced polymer (CFRP) bars

Bars made of composite fiber reinforced polymers (FRP) are becoming more popular in prestressing concrete structures.;An iterative design procedure is also proposed to estimate the ultimate load carrying capacity of the beam taking into consideration the variation of the stress that occurs in the unbonded tendons during the different stages of loading. A computer program was developed to cover the iterative procedure of the analysis and predicts the ultimate load carrying capacity. The analytical process for evaluating the ultimate moment is based on the deflected shape of the double-tee beam. (Abstract shortened by UMI.);A full-scale test was undertaken at the Construction Technology Laboratories for a double-tee beam prestressed internally and externally with carbon fibers. An analysis has been conducted to evaluate the behaviour and the ultimate strength of the beam by using the classical analytical equations to examine their correlation with the structural test results. The stresses and deflections obtained from the analysis showed good comparison with the test results.