The Effect of Cohesive Debonding Elimination on Enhancing the Flexural Performance of Damaged Unbonded Prestressed Concrete Girders Strengthened Using NSM CFRP

This manuscript studied the effect of U-CFRP wrapped sheet anchorage on flexural performance unbonded post-tensioned PC members subjected to partial strand damage and strengthened using CFRP Near-Surface Mounting techniques. The program includes six girders as a control girder, girder with 14.2%, four by laminates NSM technique without anchorages. testing results show that 14.2% has reduced strength 5.71%. NSM-CFRP laminate significant 17.4%. On other hand, application end anchorages improves 27.97% enhances ductility. intermediate successive increase 36.56% 32.61%, enhancing stiffness at all loading stages improving Semiempirical equations were developed determine actual stress strands considering U-FRP-wrapped