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Intermediate crack induced debonding in concrete beams strengthened with CFRP plates
Technical University of Denmark, DTU.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0001-7799-5809
2009 (English)In: Advances in Structural Engineering, ISSN 1369-4332, E-ISSN 2048-4011, Vol. 12, no 6, p. 793-806Article in journal (Refereed) Published
Abstract [en]

FRP composites are becoming a material of choice in an increasing number of rehabilitation and retrofitting projects around the world. Depending on the design objectives, these materials can be used to improve one or more of the structural member characteristics, such as the load capacity, ductility and even durability. Design of structural strengthening applications using externally bonded FRP composites is usually based on conventional design approaches with improvement to account for the presence and characteristics of the FRP material. Non-conventional design issues that are specific to the type of application require special considerations for their proper inclusion in the design process. One such design issue is the debonding problems in externally bonded FRP strengthening applications that have been a concern and a research challenge since the initial development stages of the strengthening method. End-peeling has governed a large interest and several debonding models have been presented. However, interfacial peeling at flexural cracks has not attained the same focus - even though this debonding failure is most likely more common. This paper presents laboratory tests of concrete beams strengthened in flexure with CFRP epoxy bonded plates. Wrapping with CFRP sheets was applied in order to try to localize the failure initiation. Concrete cracking as well as debonding initiation and propagation was possible to observe with help of advanced optical measuring system and high speed camera.

Place, publisher, year, edition, pages
2009. Vol. 12, no 6, p. 793-806
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-9593DOI: 10.1260/136943309790327699ISI: 000273104300005Scopus ID: 2-s2.0-77049101545Local ID: 83df08d0-fc32-11de-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-9593DiVA, id: diva2:982531
Note
Validerad; 2009; 20100108 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Täljsten, Björn

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