Flexural Strengthening of RC Beams with Prestressed CFRP Strips: Development of Novel Anchor and Tensioning System
Publication: Journal of Composites for Construction
Volume 24, Issue 3
Abstract
External prestressing with carbon fiber-reinforced polymer (CFRP) strips is currently a well-developed and widely used technique to strengthen reinforced concrete structures subjected to bending. This paper presents the development and experimental investigation of a novel anchor and tensioning system for the flexural strengthening of RC elements with prestressed CFRP strips. The research on anchorages comprised a series of small-, medium-, and full-scale tensile tests, which resulted in the development of a new anchorage type with a tensile capacity of 200 kN, as well as the relevant tensioning device. This new system was subjected to comprehensive tests on RC beams in the laboratory, in which the efficiency, feasibility and ergonomics of the system were examined. The CFRP prestressed beams exhibited a more than 50% higher carrying capacity than that of the reference beam without strengthening. They also proved to have lower deflections as well as a lower number of cracks. As a result of the research, an effective strengthening system was developed and examined in the laboratory. Its efficiency and feasibility were also confirmed in the field tests on a strengthened existing bridge, and recently it has been successfully implemented in practice.
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Acknowledgments
The described research has been conducted within the frame of the project “Innovative system for strengthening building structures using tensioned CFRP strips” in the Innovative Economy Operational Programme (POIG). Project no. POIG.01.03.01-18-010/12 was co-financed by the Polish National Centre for Research and Development (NCBiR).
Authors would like to acknowledge Mr. Bogdan Kotecki, Mr. Maciej Gubernat, and Mr. Tomasz Lis (AGH University of Science and Technology, Cracow) for their technical support.
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Published In
Journal of Composites for Construction
Volume 24 • Issue 3 • June 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 12, 2018
Accepted: Nov 18, 2019
Published online: Apr 10, 2020
Published in print: Jun 1, 2020
Discussion open until: Sep 10, 2020
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