Shear Resisting Mechanisms of ECC FRP Strengthened RC Beams
Publication: Journal of Composites for Construction
Volume 28, Issue 5
Abstract
This paper presents the results of a study that investigates the mechanisms of shear resistance in reinforced concrete (RC) beams that are shear-strengthened with engineered cementitious composites (ECCs) and fiber-reinforced polymer (FRP). The ECC FRP utilizes ECC as the bonding agent between the FRP and concrete and the FRP as the high-strength reinforcement. The test program was divided into three groups: (1) 15 dog-bone shaped ECC FRP coupons; (2) 27 ECC FRP push-off blocks; and (3) two ECC FRP shear-strengthened RC beams 125 mm wide, 300 mm high, and 2,640 mm long. Groups 1 and 2 aimed at investigating the uniaxial tension and push-off behavior, respectively, by simulating the crack separation and sliding mechanisms. These mechanisms are fundamental to understanding the shear resistance of the ECC FRP and are characterized by the applicable tensile stress–strain and shear stress–sliding laws. The embedded FRP mesh in the ECC FRP composites significantly enhances the crack sliding that is required for shear strength development, with a minimal impact on the tensile and shear strengths. In addition, the precrack width reduced the shear strength of the ECC FRP. Group 3 aimed to investigate the shear behavior of the ECC FRP beams. The crack width and sliding were monitored during loading, which provides insights into the shear contributions from the concrete, steel stirrups, and ECC FRP. The results reveal a major shift in the shear capacity contribution from the concrete to the ECC FRP in the strengthened beams, which led to a substantial shear improvement. The contributions of the ECC FRP to shear resistance by crack separation and sliding were comparable throughout the loading process. The FRP meshes in the ECC FRP composites effectively limited deformation, maintained structural integrity, and redistributed the shear capacity from the ECC FRP to concrete.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published article.
Acknowledgments
The work by the authors is supported by the National Natural Science Foundation of China (Grants 52078297 and 51608137), the Natural Science Foundation of Guangdong Province (Grant 2023A1515012346), the Shenzhen Science and Technology Innovation Commission (Grants JCYJ20220531101206014 and 20231127152911001), and the International Academic Impact Promotion Project funded by the International Office of Shenzhen University (Grant 2050910). Any opinions, findings, conclusions, or recommendations that are expressed in this paper are those of the authors and do not necessarily reflect the views of the funding agencies.
Notation
The following symbols are used in this paper:
- Asi
- effective area of the ith steel stirrups crossed by shear crack;
- befi
- width of the ith meshed ECC FRP along the shear crack;
- lc
- length of shear crack;
- n
- number of meshes along the shear crack;
- tef
- thickness of ECC FRP;
- tefi
- thickness of the ith meshed ECC FRP along the shear crack;
- V
- total shear capacity;
- Vc
- shear capacity contributed by concrete;
- Vef
- shear capacity contributed by ECC FRP;
- Vef,σ
- components of ECC FRP shear contribution due to crack tensile stress;
- Vef,τ
- components of ECC FRP shear contribution due to crack shear stress;
- Vs
- shear capacity contributed by steel;
- θ
- inclined angle of shear crack;
- θi
- inclined angle of the ith meshed ECC FRP along the shear crack.;
- σsi
- tensile stress of the ith steel stirrup at intersection with the shear crack;
- σef
- tensile stress of ECC FRP;
- σefi
- tensile stress of the ith meshed ECC FRP along the shear crack;
- τef
- shear stress of ECC FRP; and
- τefi
- shear stress of the ith meshed ECC FRP along the shear crack.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 28 • Issue 5 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: May 26, 2023
Accepted: May 24, 2024
Published online: Jul 12, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 12, 2024
ASCE Technical Topics:
- Beams
- Composite materials
- Concrete
- Concrete beams
- Continuum mechanics
- Engineering materials (by type)
- Engineering mechanics
- Fiber reinforced composites
- Fiber reinforced polymer
- Fluid mechanics
- Hydraulic engineering
- Hydrologic engineering
- Material mechanics
- Material properties
- Materials engineering
- Polymer
- Reinforced concrete
- Shear resistance
- Shear strength
- Strength of materials
- Structural engineering
- Structural members
- Structural systems
- Synthetic materials
- Viscosity
- Water and water resources
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