Three-Dimensional Finite-Element Modeling of the Thermomechanical Response of GFRP-Reinforced Concrete Slab Strips Subjected to Fire
Publication: Journal of Composites for Construction
Volume 26, Issue 5
Abstract
The fire design of reinforced concrete (RC) members with glass fiber–reinforced polymer (GFRP) bars comprising lap splices and cold anchoring zones requires the explicit consideration of the GFRP–concrete bond degradation with temperature; however, few studies in the literature have addressed this issue. This paper presents numerical investigations in which three-dimensional finite-element models were developed to simulate fire resistance tests performed in GFRP-RC slab strips subjected to a fire load and current standards. The slabs comprised continuous and spliced reinforcements, as well as different concrete cover thicknesses and concrete strengths. In the models, the GFRP–concrete interaction was simulated by means of previously calibrated local bond stress–slip laws at different temperatures. This study provided new insights into the fire behavior of GFRP-RC flexural members, confirming that their fire resistance can be drastically reduced when lap splices, designed for ambient temperature conditions, are directly exposed to heat and that even adopting relatively low concrete cover, fire endurances above 120 min can be attained provided that the bars’ anchors remain sufficiently cold.
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Acknowledgments
The authors acknowledge FCT (project FireComposite PTDC/ECM-EST/1882/2014) and CERIS for funding the research. The second author also thanks the financial support of FCT through scholarship SFRH/BD/129681/2017. The authors are grateful for the Foundation for Science and Technology’s support through funding UIDB/04625/2020 from the research unit CERIS.
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Journal of Composites for Construction
Volume 26 • Issue 5 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 21, 2021
Accepted: Apr 21, 2022
Published online: Jun 23, 2022
Published in print: Oct 1, 2022
Discussion open until: Nov 23, 2022
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Cited by
- Inês C. Rosa, João P. Firmo, João R. Correia, Luke A. Bisby, Fire Behavior of GFRP-Reinforced Concrete Structural Members: A State-of-the-Art Review, Journal of Composites for Construction, 10.1061/JCCOF2.CCENG-4268, 27, 5, (2023).
- Inês C. Rosa, João P. Firmo, João R. Correia, Fire behaviour of GFRP-reinforced concrete slab strips. Effect of straight and 90° bent tension lap splices, Engineering Structures, 10.1016/j.engstruct.2022.114904, 270, (114904), (2022).