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Polymers 2015, 7(10), 2100-2118; doi:10.3390/polym7101502

Flexural Strengthening of RC Slabs with Prestressed CFRP Strips Using Different Anchorage Systems

1
Institute for Sustainability and Innovation in Structural Engineering (ISISE), Department of Civil Engineering, University of Minho, Guimarães 4800-058, Portugal
2
Structural Engineering Research Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland
3
Department of Structural Mechanics, ETHZ, Swiss Federal Institute of Technology Zurich, Stefano-Franscini-Platz 5, Zürich 8093, Switzerland
Correia, L., Texeira, T., Sena-Cruz, J., Michels, J.: Flexural Strengthening of RC Slabs with Prestressed CFRP strips using different Anchorage Systems, 7th International Conference on FRP Composites in Civil Engineering (CICE2014), Vancouver (BC, Canada), 2014.
*
Author to whom correspondence should be addressed.
Academic Editor: Raafat El-Hacha
Received: 15 July 2015 / Revised: 26 August 2015 / Accepted: 10 October 2015 / Published: 23 October 2015
View Full-Text   |   Download PDF [1198 KB, uploaded 23 October 2015]   |  

Abstract

Externally Bonded Reinforcement (EBR) technique has been widely used for flexural strengthening of concrete structures by using carbon fiber-reinforced polymers (CFRP). EBR technique offers several structural advantages when the CFRP material is prestressed. This paper presents an experimental and numerical study on reinforced (RC) slabs strengthened in flexure with prestressed CFRP strips as a structural strengthening system. The strips are applied as an externally bonded reinforcement (EBR) and anchored with either a mechanical or a gradient anchorage. The former foresees metallic anchorage plates fixed to the concrete substrate, while the latter is based on an accelerated epoxy resin curing followed by a segment-wise prestress force decrease at the strip ends. Both anchorage systems, in combination with different CFRP strip geometries, were subjected to static loading tests. It could be demonstrated that the composite strip’s performance is better exploited when prestressing is used, with slightly higher overall load carrying capacities for mechanical anchorages than for the gradient anchorage. The performed investigations by means of a cross-section analysis supported the experimental observation that in case a mechanical anchorage is used, progressive strip debonding changes the fully bonded configuration to an unbonded end-anchored system. The inclusion of defined debonding criteria for both the anchorage zones and free length between the anchorage regions allowed to precisely capture the ultimate loading forces. View Full-Text
Keywords: RC plate strengthening; CFRP strips; prestressing; mechanical anchorage; gradient anchorage; static loading tests; cross-section analysis; numerical simulations RC plate strengthening; CFRP strips; prestressing; mechanical anchorage; gradient anchorage; static loading tests; cross-section analysis; numerical simulations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sena-Cruz, J.; Michels, J.; Harmanci, Y.E.; Correia, L. Flexural Strengthening of RC Slabs with Prestressed CFRP Strips Using Different Anchorage Systems. Polymers 2015, 7, 2100-2118.

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