Shear Strength and Crack Width Control of Concrete Beams with High-Strength Shear Reinforcement
Publication: Journal of Structural Engineering
Volume 150, Issue 3
Abstract
There is a potential to reduce steel tonnage for construction through the use of high-strength steel reinforcement. However, the current version of the ACI 318 code limits the yield strength of reinforcement that could be used for shear design under gravity load conditions to 420 MPa to control diagonal crack widths. This limit is increased to 550 MPa for resisting seismic shear in special moment frames. In the current study, 12 full-scale RC beam specimens were tested to investigate the shear behavior of RC beams with high-strength SD790 () shear reinforcement. The test variables considered in the experimental study were shear-span-to-depth ratio, stirrup spacing, stirrup yield strength, concrete compressive strength, and longitudinal reinforcement ratio. The test results of this research and those collected from the literature showed that the stress limit of the ACI 318 shear strength equations could be increased to 600 MPa for shear strength calculation. The stress limit of 790 MPa produced conservative predictions for most of the test data and for all the data if the strength reduction factor for shear design was considered. However, the degree of conservatism was significantly reduced. Also, an equation to estimate the maximum shear crack width was proposed. The proposed crack-width equation was able to predict the crack widths observed in the current and other reference studies with reasonable accuracy.
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Data Availability Statement
Some or all data, models, or codes generated or used during the study are available from the corresponding author by request. (Lateral force and displacement relationships.)
Acknowledgments
The authors would like to thank the support from the National Science and Technology Council of Taiwan under Contract No. 111-2625-M-002-009 and the National Center for Research on Earthquake Engineering (NCREE) of Taiwan. The authors also sincerely thank Chieh-Yu Huang for her assistance in conducting the experiments.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 3 • March 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 15, 2023
Accepted: Nov 7, 2023
Published online: Jan 16, 2024
Published in print: Mar 1, 2024
Discussion open until: Jun 16, 2024
ASCE Technical Topics:
- Beams
- Concrete
- Concrete beams
- Continuum mechanics
- Cracking
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fracture mechanics
- High-strength concrete
- High-strength steel
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Metals (material)
- Reinforced concrete
- Shear strength
- Shear tests
- Solid mechanics
- Steel
- Strength of materials
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
Authors
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