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The load-bearing of composite slabs with steel deck under natural fires

2022Journal article Open access
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dc.contributor.authorAlencar Filho, Marcílio Mariano
dc.contributor.authorPiloto, P.A.G.
dc.contributor.authorBalsa, Carlos
dc.date.accessioned2022-03-04T14:35:15Z
dc.date.available2022-03-04T14:35:15Z
dc.date.issued2022
dc.description.abstractComposite slabs with steel deck combine the load-bearing resistance of the steel deck and rebar with the compressive resistance of the concrete (components). Unprotected composite slabs may be exposed to natural fire conditions from below, and steel reduces its load-bearing capacity during the heating stage. In short fire events, with limited deformations, the composite slabs can recover the load-bearing capacity during the cooling stage. This research presents the validation of the numerical model and the development of a parametric study, to evaluate the load-bearing capacity during the fire event. This method includes a time step procedure, based on the average temperature calculation for each component, including the reduction coefficients applied to the design strength of each material. A new proposal is also presented to evaluate the residual loadbearing capacity. In some circumstances, the residual load-bearing can be reduced by more than 20%. The results showed that the highest variation in the load-bearing resistance of composite slabs occurs when the steel temperatures are between 20 and 600 ℃, after this temperature, the steel has already lost most of its mechanical strength. Moreover, it was observed that different heating rates and different cooling rates influence the rate of the reduction and recovery of the load-bearing capacity. It was also noticed that the lowest load-bearing capacity of the composite slabs was reached after the end of the heating phase, showing that the stability of the element during the heating phase does not guarantee fire safety during the cooling phase.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAlencar Filho, Marcílio Mariano; Piloto, P.A.G.; Balsa, Carlos (2022). The load-bearing of composite slabs with steel deck under natural fires. AIMS Materials Science. ISSN 2372-0484. 9:1, p. 150-171pt_PT
dc.identifier.doi10.3934/matersci.2022010pt_PT
dc.identifier.issn2372-0484
dc.identifier.urihttp://hdl.handle.net/10198/25165
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectComposite slabspt_PT
dc.subjectSteel deckpt_PT
dc.subjectNatural firept_PT
dc.subjectLoad-bearingpt_PT
dc.subjectResidual resistancept_PT
dc.titleThe load-bearing of composite slabs with steel deck under natural firespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage171pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage150pt_PT
oaire.citation.titleAIMS Materials Sciencept_PT
oaire.citation.volume9pt_PT
person.familyNamePiloto
person.familyNameBalsa
person.givenNamePaulo A.G.
person.givenNameCarlos
person.identifier1721518
person.identifier.ciencia-id0519-449D-6F13
person.identifier.ciencia-idDE1E-2F7A-AAB1
person.identifier.orcid0000-0003-2834-0501
person.identifier.orcid0000-0003-2431-8665
person.identifier.ridB-4866-2008
person.identifier.ridM-8735-2013
person.identifier.scopus-author-id6506406159
person.identifier.scopus-author-id23391719100
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationbaaee084-ab97-4c95-b636-24ab6bab0e3e
relation.isAuthorOfPublicationd0e5ccff-9696-4f4f-9567-8d698a6bf17d
relation.isAuthorOfPublication.latestForDiscoveryd0e5ccff-9696-4f4f-9567-8d698a6bf17d

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