Effect of Existing Structure and FRP Uncertainties on the Reliability of FRP-Based Repair
Publication: Journal of Composites for Construction
Volume 15, Issue 4
Abstract
Externally bonded fiber-reinforced polymer (FRP) has been successfully implemented to repair existing RC structures. Previous studies on the development of a reliability-based design method for externally bonded FRP have considered the additional uncertainties introduced by the FRP, but have relied on descriptions of the existing concrete and reinforcing steel representative of new construction. These descriptions are unlikely to be appropriate for an in-service structure in need of repair. This paper investigates the effects of different levels of uncertainty in existing RC structures and FRP materials on the reliability of repairs designed with ACI 440.2R-08 recommendations. Repairs to restore flexural strength for each beam in an inventory of rectangular and -shaped beams were designed. The reliability index of these repair designs was evaluated to identify the most influential variables on the reliability of the FRP repairs. When the effects of the existing structure were compared with those of the FRP material, uncertainties related to the existing structure had a much greater impact on the reliability of repair designs. The most significant uncertainties were related to the area of the remaining reinforcing steel and the existing concrete strength.
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 4 • August 2011
Pages: 635 - 643
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 17, 2010
Accepted: Dec 14, 2010
Published online: Dec 16, 2010
Published in print: Aug 1, 2011
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