Decomposition of the Shear Capacity of Steel Fiber–Reinforced Concrete Coupling Beams
Publication: Journal of Structural Engineering
Volume 147, Issue 11
Abstract
Steel fiber–reinforced concrete (SFRC) is extensively used in coupling beams due to its superior mechanical properties. In this study, the two-parameter kinematic theory is modified by introducing the consideration of the critical crack angle and longitudinal reinforcement strain. The modified method is validated by 64 sets of experimental coupling beams in the literatures, and the predicted shear capacities are found to have good agreement with the test results. Moreover, the decomposition of the shear capacity provided by steel fibers, stirrups, the critical loading zone, aggregate interlock, and the dowel action of the longitudinal reinforcement can be evaluated separately. Thus, the effects of the span-to-depth ratio, volume fractions of fibers, and stirrup ratios on the shear capacity are investigated. Additionally, the equivalent substitution relationship between stirrups and steel fibers is quantified, which provides a solution to the reduction of the density of stirrups in coupling beams and similar components.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Shanghai Science and Technology Innovation Project (Grant No. 2017-01-07-00-07-E00006) and the National Natural Science Foundation of China (Grant Nos. 51538010 and 51678439).
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Published In
Journal of Structural Engineering
Volume 147 • Issue 11 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 24, 2020
Accepted: Jun 22, 2021
Published online: Aug 27, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 27, 2022
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