Behavior of Simply Supported and Continuous Concrete Deep Beams Reinforced with GFRP Bars
Publication: Journal of Composites for Construction
Volume 24, Issue 4
Abstract
Reinforced concrete deep beams are common structural elements in bridges and high-rise buildings because of their ability to support higher concentrated loads compared with slender beams. In this study, three simply supported deep beams and three continuous deep beams reinforced with glass fiber-reinforced polymer (GFRP) bars were constructed and tested to failure. The test variable was the shear span-to-depth ratio, which varied between 1.0 and 2.0. Test results are presented in terms of cracking, deflection, strains in concrete and reinforcement, load capacity, and mode of failure. The cracking pattern and measured strains indicated the development of the arch action mechanism in all specimens. Test results indicated that increasing the shear span-to-depth ratio led to a significant decrease in the load-carrying capacity of the beams. Moreover, continuous beams exhibited higher load capacity than did their simply supported counterparts. In addition, a comparison between the experimental and code-predicted load capacity of beams is presented.
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Acknowledgments
The authors wish to express their gratitude and sincere appreciation for the financial support received from the Natural Sciences and Engineering Council of Canada (NSERC). In addition, the assistance received from the technical staff of the McQuade Structures Laboratory at the University of Manitoba is acknowledged.
Notation
The following symbols are used in this paper:
- a
- clear shear span;
- b
- beam width;
- c
- distance from soffit of beam to center of longitudinal bottom reinforcement;
- c′
- distance between top surface of beam and center of longitudinal top reinforcement;
- D
- effective depth of beam section;
- Fe
- load capacity of concrete strut in exterior shear span;
- Fi
- load capacity of concrete strut in interior shear span;
- concrete compressive strength;
- h
- overall depth of beam section;
- jd
- distance between the center of top and bottom nodes;
- l
- span of beam;
- le
- width of exterior support plate;
- li
- width of interior support plate;
- ln
- clear span;
- lp
- width of loading plate;
- Pf
- ultimate load capacity;
- wi
- width of interior concrete strut;
- we
- width of exterior concrete strut;
- χ
- ratio of reaction in end support to the applied load; and
- θ
- angle between concrete strut and longitudinal axis of beam.
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Published In
Journal of Composites for Construction
Volume 24 • Issue 4 • August 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 19, 2019
Accepted: Feb 6, 2020
Published online: May 20, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 20, 2020
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