Implementation of GFRP-RC Code Provisions: Detailing for Deflection Criteria
Publication: Journal of Composites for Construction
Volume 27, Issue 2
Abstract
The American Concrete Institute has developed a design standard for glass fiber–reinforced polymer (GFRP) RC members, dependent to their standard for steel-reinforced structural concrete. Design examples conforming to code language have been developed and their solutions examined to understand the impacts that code requirements have on the design of GFRP-RC members. The impacts include selecting member dimensions and reinforcement on the basis of serviceability requirements, rather than strength, and the related detailing issues involving bar cutoff points. As the design of GFRP-RC members is typically controlled by serviceability requirements, some reinforcement may be provided to satisfy deflection requirements. Cutoff points for such bars must be located differently than for steel bars, where the cutoff point is determined by strength requirements. A proposed method locates cutoffs by calculating the resulting maximum deflections as the cutoff point is varied. A second, approximate, approach locates cutoffs at points where continuing bars provide the same value for effective moment of inertia as that available from all bars at the critical section. The second method results in longer bar lengths but is more easily applied. Shear and crack control requirements should also be checked at cutoff locations.
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References
ACI (American Concrete Institute). 2014. The reinforced concrete design manual. ACI SP-17. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2015. Guide for the design and construction of structural concrete reinforced with FRP bars. ACI 440.1R-15. Farmington Hills, MI: ACI.
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© 2023 American Society of Civil Engineers.
History
Received: Dec 19, 2021
Accepted: Dec 13, 2022
Published online: Feb 14, 2023
Published in print: Apr 1, 2023
Discussion open until: Jul 14, 2023
ASCE Technical Topics:
- Bars (structure)
- Building materials
- Concrete
- Construction engineering
- Construction management
- Engineering materials (by type)
- Fiber reinforced polymer
- Fibers
- Glass
- Glass fibers
- Materials engineering
- Polymer
- Reinforced concrete
- Standards and codes
- Structural engineering
- Structural members
- Structural systems
- Synthetic materials
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