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Problem statement: Prestressed Concrete (PC) I section girder with Reinforced&#13; Concrete (RC) topping slab has been widely applied to long span bridge girders for several years.&#13; A bridge girder is subjected to severe conditions caused by an aggressive environment and&#13; overloading. A crack can be initiated and propagate when the tensile stress exceeds the tensile&#13; strength of concrete due to overloading. Deterioration of the girder may be caused by a wide crack&#13; due to corrosion of the reinforcement and other mechanisms. Prestressing force and flexural&#13; stiffness (EI) of PC-I section girder are reduced depending on the level of overloading and the&#13; corresponding damage. Approach: Full scale tests of Type III AASHTO highway girder with a 20&#13; cm thick RC topping slab were performed to study both the degradation process due to&#13; overloading and also the effects of external post-tension in the recovery of structural performance&#13; of a damaged highway PC bridge girder. Results: The results showed that degradation, loss of&#13; internal prestressing force in the PC-I girder and flexural stiffness of the composite girder depend&#13; directly on Damage Index (DI) expressed in terms of permanent deformation. External post&#13; tension with three levels of prestressing forces was applied to strengthen the damaged girder to&#13; recover its structural performance, flexural stiffness and strength. A simplified analytical model,&#13; verified by test results, was developed to predict flexural behaviors, loss of internal prestressing&#13; force and flexural stiffness of highway girder due to overloading and also structural performance&#13; of the strengthened girder. Conclusion: It was found that the required external prestressing force&#13; to effectively recover structural performance of a damaged girder depended directly on the&#13; damage index of the girder

Flexural Behaviors of Damaged Full-Scale Highway Bridge Girder Strengthened by External Post Tension