Abstract
Corrosion of the tendons is a common issue in post-tensioned prestressed concrete (PC) beams and this paper describes the flexural behavior of PC beams having damaged tendons. The tendons of the PC beams were intentionally damaged by core drilling from the side of the PC beam or accelerated corrosion process. Beam flexural tests were carried out to confirm the influence of damage location and degree of damage of the tendons on the load carrying capacity of the PC beams. A nonlinear pushover analysis was performed using fiber model and the analysis results were verified by the experiment results. From the analysis it was found that the load carrying capacity of the PC beams having damaged tendons can be estimated with a relatively high accuracy by using the proposed fiber model, obtained by converting the mass reduction rate of the PC tendon and the influence length of rupture to the sectional area of the PC tendon. Furthermore, the fiber model was applied for a PC box girder, assuming the location of the corrosion and the grout filling condition of PC tendon. The analysis results were used to estimate the safety of the PC box girder for different failure criteria such as tendon fracture and bending fracture.
