Experimental Investigation of the Shear Resistance Mechanism on Hybrid NSC-UHPC Predamaged and Undamaged Unidirectional Bridge Slabs
Publication: Journal of Structural Engineering
Volume 149, Issue 9
Abstract
This paper investigates the shear behavior of unidirectional hybrid slabs made of a normal-strength concrete (NSC) substrate and an ultrahigh-performance concrete (UHPC) overlay on the tensile side. The impacts of two important aspects on the shear behavior were studied. First, various strengthening configurations (thickness, with or without NSC substitution, with existing and/or new rebars) were investigated, specifically two configurations scarcely studied in the scientific literature. Second, the state of damage of the NSC slab prior to the overlay application was examined for the first time. The hybrid slabs tested behaved monolithically until the establishment of a composite mechanical action occurring at up to 1.66 times the reference shear resistance. The composite mechanical action offered structural hardening with significant increase of shear resistance up to 2.50 times the reference shear resistance. Strain distribution and reorganization was monitored on the slabs using digital image correlation technology, and showed creation of a strut and tie system in four successive steps. Both the UHPC thickness and the total area of longitudinal rebar had a significant impact on the ultimate shear resistance. The effect of the load history on the ultimate shear resistance was limited, and partly masked by the combined effect of the type of NSC-UHPC interface and the overlay configuration influencing the crack pattern.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published paper.
Acknowledgments
This project was financially supported by the Discovery Grant of the Natural Science and Engineering Research Council of Canada (NSERC) granted to Prof. J.-P. Charron and by a Ph.D. Scholarship of the Fonds de recherche du Québec–Nature et technologies (FRQNT) awarded to M. Pharand. The authors acknowledge Sika Canada for the UHPC donation, and the technical team of the Group for Research in Structural Engineering (GRS) for its crucial help with the experiments.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 13, 2022
Accepted: May 10, 2023
Published online: Jul 13, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 13, 2023
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Cited by
- Tongxu Liu, Jean-Philippe Charron, Analytical Model for Calculating Shear Capacity of NSC Beams Strengthened by UHPC Lateral Layers, Journal of Structural Engineering, 10.1061/JSENDH.STENG-12866, 150, 6, (2024).
- M. Pharand, J.-P. Charron, Prediction of Moment–Curvature Response and Maximum Bending Resistance for Hybrid NSC-UHPC Elements, Journal of Structural Engineering, 10.1061/JSENDH.STENG-12407, 149, 11, (2023).