Influence of the PBO-FRCM Composite Configuration on the Shear Capacity of RC Beams
Publication: Journal of Composites for Construction
Volume 26, Issue 4
Abstract
In this paper, the results of tests that will be carried out on beams strengthened in shear with polybenzoxazole fabric–reinforced cementitious matrix (PBO-FRCM) composites will be presented and compared with the results of theoretical calculations. Tests will be carried out on 12 RC T beams strengthened in shear with anchored or unanchored PBO-FRCM stirrups with different widths and spacing. Strain gauges and the digital image correlation (DIC) method will be used to measure the deformation of the composite. The mechanisms of failure of the beams will be analyzed and described. The shear capacity will be calculated based on the characteristics of the materials and the specimens used in the tests. The results of the calculations that are based on the latest standards and theoretical modeling showed that the shear capacity of the T beams with transverse steel reinforcement and anchorage were significantly underestimated. The results and differences between the experimental and analytical results will be discussed.
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Acknowledgments
The authors are grateful to VISBUD-Projekt Sp. z o.o. (http://www.visbud-projekt.pl) for providing the strengthening material that was used in the experimental investigations.
Notation
The following symbols are used in this paper:
- bw
- beam’s web (m);
- df
- effective depth of shear FRCM strengthening (m);
- Ecm
- modulus of elasticity of concrete (GPa);
- Esm
- modulus of elasticity of steel (GPa);
- Esm
- mean modulus of elasticity of bars (GPa);
- fcm,cyl
- cylindrical compressive strength of concrete (MPa);
- fcm,cube
- cubic compressive strength of concrete (MPa);
- fym
- mean yield stress of steel bars (MPa);
- ftm
- mean ultimate strength of steel bars (MPa);
- ffu
- ultimate strength of PBO mesh (MPa);
- ft
- ultimate tensile strength of steel (MPa);
- ffu
- ultimate strength of PBO mesh (MPa);
- ffv
- design tensile strength of the shear FRCM reinforcement (MPa);
- Vf
- contribution of the shear FRCM reinforcement (kN); and
- ɛfu
- ultimate deformation of the composite.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 4 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 9, 2021
Accepted: Feb 16, 2022
Published online: Apr 22, 2022
Published in print: Aug 1, 2022
Discussion open until: Sep 22, 2022
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