Behavior of Ultrahigh-Performance Concrete Bridge Decks with New Y-Shape FRP Stay-in-Place Formworks
Publication: Journal of Composites for Construction
Volume 26, Issue 3
Abstract
This study proposes using glass fiber–reinforced polymer (GFRP) as a stay-in-place structural formwork for casting bridge decks with ultrahigh-performance concrete (UHPC). The GFRP stay-in-place formworks completely replace the bottom layer of rebars, and the top steel reinforcement is also replaced by a GFRP mesh to mitigate the corrosion damage. The formworks were either a flat GFRP plate with square hollow section (SHS) stiffeners or a flat GFRP plate with new Y-shape stiffeners. Concentric static tests on five 1:2.75 scale decks were performed to investigate the effect of stiffener's configuration and the influence of the concrete strength on the performance of bridge decks. Rotational fixity support was used to simulate a real bridge deck connection of supporting girders. All specimens with the stay-in-place formwork exhibited punching shear failure. It was found that the use of Y-shape stiffeners significantly improved the load-carrying capacity of the proposed deck. Replacing normal concrete with UHPC further improved the loading capacity of the deck. The decks demonstrated excellent performance, with the load-carrying capacity 3.8–9.5 times higher than the established equivalent service load depending on the concrete strength and configuration of the GFRP stay-in-place formwork. Deflection at service load was less than span/1,600 for all the decks. Compared with normal-strength concrete (34 MPa), UHPC improved the maximum load-carrying capacity of the deck from 91.4 to 149 kN.
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Acknowledgments
The financial support from the Australian Research Council Laureate Fellowships FL180100196 is acknowledged. The authors thank Sika Australia Pty Ltd. and Silicon Metal Company of Australia (SIMCOA) for providing the required material for this study.
Notation
The following symbols are used in this paper:
- B
- deck width;
- b0
- perimeter of the punching shear failure plane;
- cx
- ratios of punching shear perimeters in direction of traffic to the total perimeter;
- cy
- ratios of punching shear perimeters in direction of normal to traffic to the total perimeter;
- dave
- weighted average effective depth;
- dx
- the concrete thickness to the bottom GFRP plate;
- dy
- the concrete depth measured to the centroid of the FRP repeated pattern;
- ES
- Young's modulus of steel;
- Ex
- Young's modulus of the GFRP section in direction of traffic;
- Ey
- Young's modulus of the GFRP section in direction of normal to traffic;
- compressive strength of concrete;
- L
- span length;
- Pn
- ultimate nominal shear strength;
- ρx
- GFRP reinforcement ratios in the in direction of traffic;
- ρy
- GFRP reinforcement ratios in the in direction of normal to traffic;
- ωeff
- reinforcement ratio normalized with respect to the ratio of FRP and steel modulus;
- ωx
- GFRP reinforcement index in the direction of traffic; and
- ωy
- GFRP reinforcement index in the direction normal to traffic.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 3 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 10, 2021
Accepted: Jan 15, 2022
Published online: Mar 11, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 11, 2022
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