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An experimental study on fatigue debonding growth of RC beams strengthened with prestressed CFRP plates
School of Civil Engineering and Architecture, Nanjing Institute of Technology, Nanjing, China.
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, National Engineering Research Center for Prestressing Technology, School of Civil Engineering, Southeast University, 211189 Nanjing, China.
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, National Engineering Research Center for Prestressing Technology, School of Civil Engineering, Southeast University, 211189 Nanjing, China.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-0089-8140
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2022 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 273, article id 115081Article in journal (Refereed) Published
Abstract [en]

Externally bonded Fiber Reinforced Polymer (FRP) laminates are increasingly used to strengthen Reinforced Concrete (RC) members. However, FRP debonding remains a major drawback of this strengthening method. To better understand the mechanisms of FRP debonding, six RC beams strengthened with prestressed or non-prestressed Carbon Fiber Reinforced Polymer (CFRP) plates were subjected to static and fatigue loading. CFRP plate debonding was observed in both cases. However, the mechanism of debonding differed: under cyclical fatigue loading, debonding was initiated under both loading points simultaneously and propagated synchronously towards the nearest support whereas in static tests debonding began under a single loading point and progressed suddenly towards its adjacent support. The results also showed that stress redistribution induced coupling between accumulated fatigue damage in the steel reinforcement and fatigue debonding of the CFRP plate, accelerating the fatigue failure of the specimens.

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 273, article id 115081
Keywords [en]
Debonding, Fatigue, Fiber reinforced polymer, Prestress, Reinforced concrete
National Category
Composite Science and Engineering Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-93766DOI: 10.1016/j.engstruct.2022.115081ISI: 000872113900001Scopus ID: 2-s2.0-85139993098OAI: oai:DiVA.org:ltu-93766DiVA, id: diva2:1708299
Note

Validerad;2022;Nivå 2;2022-11-03 (joosat);

Funder: Scientific Research Foundation of Nanjing Institute of Technology (YKJ202122); National Key Research and Development Program of China (2017YFC0703006-01)

Available from: 2022-11-03 Created: 2022-11-03 Last updated: 2023-02-10Bibliographically approved

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Wang, ChaoTu, YongmingSas, GabrielElfgren, Lennart

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