Title: Application of FRP in the Rehabilitation of Prestressed Concrete Girder Bridges

Author(s): Ramin Rameshni, PhD, P.Eng., Reza Sadjadi, PhD, P.Eng, Melanie Knowles, P.Eng., M.Eng.

Publication: Symposium Paper

Volume: 360

Issue:

Appears on pages(s): 530-547

Keywords: Bridge, Codes, Corrosion, Existing Structures, CFRP, Prestressed Concrete, Rehabilitation, Strengthening, Visual Inspection.

DOI: 10.14359/51740647

Date: 3/1/2024

Abstract:
Deterioration of concrete bridges has resulted in reduction of their service lives and increase in required maintenance which is associated with cost and inconvenience to the public. A prevalent cause of concrete bridge deterioration is corrosion which initiates by chloride ions penetration past the protecting layers and by corroding the steel reinforcement. Because corrosion in prestressed concrete members has more serious consequences than in non-prestressed reinforced concrete, it is important that bridge designers and inspectors be aware of the potential problems and environments that may cause the issue and address them as soon as they are detected. This paper discusses a case study of a highway bridge (Hyndman Bridge, Ontario) including its deterioration, causes, mitigation measures, structural evaluation and the selected repair method. The rehabilitation design is based on guidelines of the latest editions of the CHDBC and ACI 440.2R. CFRP strengthening techniques have been proposed to address the flexure and shear deficient capacity of deteriorated girders. It is concluded that by using a suitable repair methodology employing CFRP, it is possible to upgrade the bridge to comply with the latest requirements of the code and increase the service life of the structure which otherwise would have needed imminent replacement.