Analysis of load-strain models for RC square columns confined with CFRP

This article presents the comparison between 6 theoretical models of axially confined concrete columns with the experimental results of 7 tested columns of different authors. This study analysed the accuracy of 6 different confinement models for square columns taking into account the results of experimental tests on 7 RC columns confined with CFRP sheets with different dimensions and carried out by different authors. The profile of curves, the peak/failure values, the stress-strain and axial-to-lateral relations were studied to conclude which models show the best correlation with the experimental test results. Quantification of this deviation was carried out for key parameters. Some models predicted peak values with reasonable accuracy - Manfredi & Realfonzo, Campione & Miraglia, Lam & Teng, Pellegrino & Modena - although for the whole load-strain behaviour only the model of Faustino, Chastre & Paula seemed to be reasonably accurate in most cases.