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Concrete beams strengthened with external prestressing using external tendons and near-surface-mounted reinforcement (NSMR)
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0001-7799-5809
2007 (English)In: Report Number SP-245-9, American Concrete Institute, 2007, p. 143-164Chapter in book (Other academic)
Abstract [en]

This paper describes how the strengthening of concrete structures with fiber reinforced polymer materials has grown to be a widely used method over most parts of the world. As a way of higher utilization of the Fiber Reinforced Polymers (FRP) prestressing has proved to be beneficial. Most of the research done with prestressing Carbon Fiber Reinforced Polymers (CFRP) for strengthening has been done with surface bonded plates. However, in this paper a presentation is given where CFRP quadratic rods are bonded in the concrete cover in sawed grooves and then immediately prestressed. Testing has, proven this to be an advantageous way of bonding CFRP to the concrete. There is also a tendency that the shear forces between the CFRP and the concrete are transferred more efficiently compared to surface bonded plates and sheets. In the tests performed, no mechanical device has been used to keep the prestress during testing, which then means that the adhesive has to transfer all shear stresses to the concrete. These tests have then been compared with concrete beams strengthened with prestressed external steel and CFRP tendons and similar load carrying capacity has been obtained.

Place, publisher, year, edition, pages
American Concrete Institute, 2007. p. 143-164
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-20601Local ID: 645c01d0-1d30-11dd-8384-000ea68e967bISBN: 9780870312434 (electronic)OAI: oai:DiVA.org:ltu-20601DiVA, id: diva2:993645
Note
Godkänd; 2007; Bibliografisk uppgift: CD-ROM; 20080508 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-20Bibliographically approved

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Täljsten, BjörnNordin, Håkan

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