Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/88660
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Campo DC | Valor | Idioma |
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dc.contributor.author | Azevedo, Adriana S. | por |
dc.contributor.author | Firmo, João P. | por |
dc.contributor.author | Correia, João R. | por |
dc.contributor.author | Mohammadifirouz, Reza | por |
dc.contributor.author | Barros, Joaquim A. O. | por |
dc.date.accessioned | 2024-02-07T13:43:36Z | - |
dc.date.available | 2024-02-07T13:43:36Z | - |
dc.date.issued | 2023 | - |
dc.identifier.issn | 0141-0296 | por |
dc.identifier.uri | https://hdl.handle.net/1822/88660 | - |
dc.description.abstract | Carbon fibre reinforced polymer (CFRP) composites are now widely used to strengthen reinforced concrete (RC) structures. Among the strengthening systems available, near-surface mounted (NSM)-prestressed CFRP laminates offer several advantages, as they significantly increase the load carrying capacity and also the serviceability performance of RC structures. However, as for other CFRP systems, there is a concern about their behaviour at elevated temperature and under fire exposure due to the glass transition process undergone by their polymeric components. Nevertheless, the fire performance of NSM-prestressed-CFRP strengthening systems has not yet been investigated. This paper presents an experimental study about the fire resistance behaviour of RC slab strips strengthened with prestressed NSM-CFRP laminates; the slabs were simultaneously subjected to a mechanical (fire) load and the ISO 834 fire curve, and the influence of the following parameters on their fire resistance behaviour was assessed: (i) the prestress level (0 %, 25 % and 50 % of the CFRP tensile strength), and (ii) the presence of passive fire protection, comprising up to 48 mm thick calcium silicate (CS) boards. The results obtained showed that: (i) without fire protection, the strengthening system remained effective during a very low period of fire exposure, which significantly decreased with the prestress level, from 16 min (0 %) to less than 5 min (50 %); (ii) with fire protection, even with 50 % of prestress, the strengthening system remained effective for more than 120 min; and (iii) the “critical” temperatures in the anchorages of the strengthening systems were found to be about 2.5Tg, 2.0Tg and 1.5Tg, for the prestress levels of 0 %, 25 % and 50 %, respectively, with Tg being the glass transition temperature of the adhesive. | por |
dc.description.sponsorship | The authors wish to acknowledge FCT (project FireComposite PTDC/ECM-EST/1882/2014 and CERIS project UIDB UIDB/04625/2020); Secil and Unibet˜ao for supplying the concrete; and S&P Clever Reinforcement for supplying the CFRP laminates and the epoxy adhesive. The first author also wishes to thank the financial support of FCT through the scholarship SFRH/BD/145256/2019. | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04625%2F2020/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F145256%2F2019/PT | por |
dc.rights | openAccess | por |
dc.subject | RC slabs | por |
dc.subject | CFRP strengthening | por |
dc.subject | NSM | por |
dc.subject | Prestress | por |
dc.subject | Fire behaviour | por |
dc.title | Fire behaviour of reinforced concrete slab strips strengthened with prestressed NSM-CFRP laminates | por |
dc.type | article | - |
dc.peerreviewed | yes | por |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0141029623013974 | por |
oaire.citationVolume | 297 | por |
dc.identifier.eissn | 1873-7323 | por |
dc.identifier.doi | 10.1016/j.engstruct.2023.116982 | por |
dc.subject.fos | Engenharia e Tecnologia::Engenharia Civil | por |
sdum.journal | Engineering Structures | por |
Aparece nas coleções: | ISISE - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Fire behaviour of reinforced concrete slab strips strengthened with prestressed NSM-CFRP laminates.pdf | 8,96 MB | Adobe PDF | Ver/Abrir |