Behavior of Post-Tensioned Concrete Girders Subject to Partially Strand Damage and Strengthened by NSM-CFRP Composites

Studies on the flexural behavior of post-tensioned beams subjected to strand damage and strengthened with near-surface mounted (NSM) technique using carbon fiber-reinforced polymer (CFRP) are limited fail examine effect CFRP laminates strain strengthening efficiency systematically. Furthermore, a design approach for UPC structures in existing guidelines FRP techniques is lacking. Hence, NSM-CFRP after partial investigated this study. The testing program consists seven by three ratios (14.3% symmetrical damage, 14.3% asymmetric 28.6% damage). experimental results showed that use significantly increases capacity up 17.4 20.4%, corresponding ratio 14.3 28.6%, respectively, enhances stiffness, reduces 15.8 22.2%. However, stiffness during serviceability phases critical as increase. Additionally, semi-empirical equations were proposed predict actual unbonded strands whilst considering effects laminates. suggested provide accurate predictions little variance. Doi: 10.28991/CEJ-2022-08-07-013 Full Text: PDF