This research investigates the effectiveness of different CFRP confinement types full, horizontal, and spiral and assesses the accuracy of various design codes and stress-strain models in predicting the performance of CFRP-confined concrete. Experimental results show that fully CFRP-confined specimens exhibit a significant increase in compressive strength by 89.36% compared to unconfined concrete, which had a compressive strength of 21.42 MPa, while horizontal CFRP strips with 30 mm spacing provide notable improvements in both strength (49.53% increase) and axial strain (610.78% increase). In contrast, spiral CFRP strips demonstrated lower effectiveness. Numerical evaluations revealed that the FIB model was accurate for horizontal confinements but overestimated compressive strength for spiral confinements. The ACI code offered reasonable predictions with deviations between -16% and 19%. Pellegrino et al and Wang et al. models performed well for horizontal CFRP strips but were less accurate for spiral configurations. The model proposed by Guo et al. overestimated the compressive strength for partially confined specimens. This study provides insights for optimizing CFRP confinement strategies and highlights the need for refinement in predictive models and design codes.
This research investigates the effectiveness of different CFRP confinement types full, horizontal, and spiral and assesses the accuracy of various design codes and stress-strain models in predicting the performance of CFRP-confined concrete. Experimental results show that fully CFRP-confined specimens exhibit a significant increase in compressive strength by 89.36% compared to unconfined concrete, which had a compressive strength of 21.42 MPa, while horizontal CFRP strips with 30 mm spacing provide notable improvements in both strength (49.53% increase) and axial strain (610.78% increase). In contrast, spiral CFRP strips demonstrated lower effectiveness. Numerical evaluations revealed that the FIB model was accurate for horizontal confinements but overestimated compressive strength for spiral confinements. The ACI code offered reasonable predictions with deviations between -16% and 19%. Pellegrino et al and Wang et al. models performed well for horizontal CFRP strips but were less accurate for spiral configurations. The model proposed by Guo et al. overestimated the compressive strength for partially confined specimens. This study provides insights for optimizing CFRP confinement strategies and highlights the need for refinement in predictive models and design codes.
