Applying Prestressed CFRP Sheets to Restore Prestress Losses in Prestressed Concrete Beams


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Title: Applying Prestressed CFRP Sheets to Restore Prestress Losses in Prestressed Concrete Beams

Author(s): Y.J. Kim, C. Shi, L. Bizindavyi, and M.F. Green

Publication: Special Publication

Volume: 245


Appears on pages(s): 105-122

Keywords: carbon fiber-reinforced polymer (CFRP) sheet; damage; finite element analysis; prestressed concrete beam; strengthening

Date: 4/1/2007

The issue of the rehabilitation of damaged structures has attracted the attention of researchers to resolve undesired problems caused by increased traffic loads, corrosion, or impact damage. Appropriate methods are therefore essential for extending the lifespan of the structures. The application of carbon fiber reinforced polymer (CFRP) sheets has been reported as a promising and viable solution with many advantages such as increased flexural strength, and improved serviceability and durability. CFRP sheets may be used more efficiently by applying prestress. For this effective strengthening application, the method of prestressing CFRP sheets and its feasibility are important parameters that need further investigation. In this study, the applicability of a prestressing system is investigated on large-scale prestressed concrete beams (3.3 m span) tested under static loading. Nonlinear finite element analysis is conducted to predict the behavior of tested beams, including a parametric study to investigate the contribution of different prestress levels in the CFRP sheets to the flexural behavior of strengthened beams.