Flexural Reliability of CFRP-Strengthened Bridge Girders
Publication: Journal of Performance of Constructed Facilities
Volume 38, Issue 1
Abstract
The reliability of reinforced concrete bridge beams that are flexurally strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) laminates according to current AASHTO design provisions was quantified. The flexural resistance model considers resistance loss due to the effect of bar corrosion, FRP rupture, and debonding. Random variables were used to characterize uncertainties in as-constructed initial beam geometry and material properties, as well as loads and loss of beam resistance due to steel, concrete, and CFRP system degradation. Bond strength loss was based on 19 years of actual in situ data. The effects of various critical parameters on reliability were quantified, including beam span, concrete strength, the modular ratio and unit area of CFRP, the extent of CFRP repair, and the dead/live-load ratio. It was found that a large inconsistency in reliability exists among CFRP-repaired beams designed according to AASHTO provisions, the primary cause of which is variability in debonding potential. The results demonstrate the importance of including a well-developed bond strength model in the design process. Recommendations are provided.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 38 • Issue 1 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 1, 2023
Accepted: Sep 18, 2023
Published online: Nov 8, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 8, 2024
ASCE Technical Topics:
- Beams
- Bonding
- Bridge engineering
- Bridges
- Bridges (by material)
- Carbon fibers
- Concrete
- Concrete beams
- Concrete bridges
- Engineering materials (by type)
- Fiber reinforced concrete
- Fiber reinforced polymer
- Fibers
- Materials engineering
- Materials processing
- Polymer
- Structural behavior
- Structural engineering
- Structural members
- Structural strength
- Structural systems
- Synthetic materials
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