Title:
Implementation of GFRP-Reinforced Concrete Draft Code Provision (PrePublished)
Author(s):
Isaac Higgins, Vicki Brown, and Brendan Kearns
Publication:
Symposium Paper
Volume:
356
Issue:
Appears on pages(s):
131-151
Keywords:
GFRP; internal reinforcement; codes; design guidelines; design issues; case studies
DOI:
10.14359/51737189
Date:
8/26/2022
Abstract:
The American Concrete Institute (ACI) currently has an approved design guideline for FRP-reinforced concrete - ACI 440.1R-15 Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars. Work is in progress to develop a consensus-based design code for GFRP-reinforced concrete consistent with ACI 318-19 where possible. The code language will generally follow the principles developed in the ACI 440.1R-15 Guide, with a number of significant changes that have resulted from more recent research (e.g. changes to design limits) and the need to develop provisions in areas that ACI 440.1R-15 does not address (e.g. requirements for torsion). The proposed changes have not yet been vetted in practical design situations, so their impact is still to be fully explored. Design examples have been developed to follow the draft code language from ACI’s website for public review and comment. Their solutions are examined to understand the impact that proposed code language may have on the design of GFRP-reinforced concrete members. This paper discusses selected design examples to (1) provide evidence for proposed draft code provisions that can be practically implemented in typical design situations, and (2) identify situations in which proposed draft code language may require modification.
Related References:
AASHTO (2018). Bride design guide specifications for GFRP-reinforced concrete. 2nd Ed. American Association of State Highway and Transportation Officials, Washington, DC.
ACI (2014). The reinforced concrete design manual. SP-17 American Concrete Institute, Farmington Hills, MI.
ACI Committee 318 (2019). Building code requirements for structural concrete and commentary. American Concrete Institute, Farmington Hills, MI.
ACI Committee 440 (2005). Guide for the design and construction of structural concrete reinforced with FRP bars. 440.1R-15 American Concrete Institute, Farmington Hills, MI.
ACI Code-440 (2022). Code requirements for structural concrete reinforced with GFRP bars and commentary. Public Discussion draft https://www.concrete.org/publications/standards/upcomingstandards.aspx
ASTM D7957/D7957M (2017). Standard specification for solid glass round fiber reinforced polymer bars for concrete reinforcement. ASTM International, West Conshohocken, PA.
Benmokrane, B., Brown, V., Mohamed, K., Nanni, A., Rossini, M. and Shield, C. (2019). Creep rupture limit for GFRP bars subjected to sustained loads. Journal of Composites for Construction 23(6).
Canadian Standards Association Committee S6 (2019). Canadian highway bridge design code. CSA Group, Toronto ON.
Canadian Standards Association Committee S806 (2012, reaffirmed 2017). Design and construction of building structures with fibre-reinforced polymers. CSA Group, Toronto, ON.
Euro code 2 (2014). Design of concrete structures. European Committee for Standardization, Brussels, Belgium.
fiB (2013). fiB model code for concrete structures 2010. Ernst & Sohn, Berlin, Germany.
Higgins, I.C. (2020). Impact of changes in the design methodology between the American Concrete Institute’s draft code provisions for GFRP-reinforced concrete and the ACI 440.1R-15 guide for the design and construction of structural concrete reinforced with FRP bars. Master’s Thesis, Widener University, Chester, PA.
Shield, C., Brown, V., Bakis, C. and Gross, S. (2019). A recalibration of the crack width bond factor for GFRP - reinforced concrete. Journal of Composites for Construction 23(4).
Weber, André. (2016). FRP reinforcement for concrete between material approval and European design standard. Presentation at the 13th EPTA World Pultrusion Conference, Prague, Czech Republic