Improving the Failure Mode of Over-Reinforced Concrete Beams Using Strain-Hardening Cementitious Composites
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 5
Abstract
Over-reinforced sections fail suddenly by compression concrete crushing when their ultimate compressive strain has been exceeded but the longitudinal reinforcement strain has not yielded. This study investigates the use of cementitious repair materials for the compression side of over-reinforced concrete beams to change their failure mode to ductile failure. In this study, 11 over-reinforced concrete beams were cast (1 as a control specimen and 10 as strengthened beams). The study’s strengthening material was an ultra-high-performance strain-hardening cementitious composite (UHP-SHCC). The effect of shear connectors with the strengthening material was investigated. Meanwhile, replacement of the concrete cover, use of a welded wire mesh inside the additional layer, and concrete strength were tested. Crack pattern and failure modes were noted, and deflection behavior, failure loads, steel strains, and crack width were measured. The tests results showed that using strengthening UHP-SHCC material is a highly effective method to increase the load--carrying capacity of existing over-reinforced concrete beams, and demonstrated the contribution of the proposed technique to improving the ductility behavior of over-reinforced concrete beams.
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Acknowledgments
The tests in this study were performed at the Reinforced Concrete Laboratory, Faculty of Engineering, Tanta University. The authors are grateful for the precious technical assistance of the lab staff.
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 5 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 22, 2015
Accepted: Oct 26, 2015
Published online: Jan 6, 2016
Discussion open until: Jun 6, 2016
Published in print: Oct 1, 2016
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