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Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates

2019-12-04Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Civil
datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
datacite.subject.fosEngenharia e Tecnologia::Engenharia dos Materiais
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
dc.contributor.authorDias-da-Costa, D.
dc.contributor.authorNeves, L. A. C.
dc.contributor.authorGomes, S.
dc.contributor.authorGraça-e-Costa, R.
dc.contributor.authorHadigheh, S. A.
dc.contributor.authorFernandes, P.
dc.date.accessioned2025-09-26T15:53:04Z
dc.date.available2025-09-26T15:53:04Z
dc.date.issued2019-12-04
dc.description.abstractThis paper provides a framework for the calibration of partial safety factors in prestressed concrete (PC) girders strengthened in flexure with carbon fiber-reinforced polymer (CFRP) laminates. A hybrid approach was proposed to take advantage of comprehensive nonlinear numerical models in reliability analysis using a first-order reliability method (FORM) in conjunction with the response surface method (RSM). The PC girders selected for analyses were taken from real structures designed and built in the 1980s based on old standards that now require strengthening and upgrade due to partial corrosion of the prestressing strands. Using the proposed approach, a sensitivity analysis was performed to identify the most relevant variables and assess the area of CFRP laminates needed to restore capacity up to new design standards. A partial safety factor was proposed for strengthening PC girders using CFRP laminates. Sensitivity analysis showed that traffic loads and model uncertainties are the most important variables for calibration.eng
dc.description.sponsorshipS. Gomes acknowledges the financial support of the Portuguese Science and Technology Foundation (FCT) through the Ph.D. grant number SFRH/BD/76345/2011. D. Dias-da-Costa would like to acknowledge the support from the Australian Research Council through its Discovery Early Career Researcher Award (DE150101703) and Linkage grant (LP140100591). This work was also supported by FCT, within ISISE, project UID/ECI/04029/2013.
dc.identifier.citationDias-da-Costa, D., Neves, L. A. C., Gomes, S., Graça-e-Costa, R., Hadigheh, S. A., & Fernandes, P. (2020). Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates. Journal of Composites for Construction, 24(1), 04019060. DOI: https://doi.org/10.1061/(asce)cc.1943-5614.0000993.
dc.identifier.doi10.1061/(asce)cc.1943-5614.0000993
dc.identifier.eissn1943-5614
dc.identifier.issn1090-0268
dc.identifier.urihttp://hdl.handle.net/10400.8/14137
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Society of Civil Engineers
dc.relationInstitute for Sustainability and Innovation in Structural Engineering
dc.relation.hasversionhttps://ascelibrary.org/doi/10.1061/%28ASCE%29CC.1943-5614.0000993
dc.relation.ispartofJournal of Composites for Construction
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectCFRP laminates
dc.subjectconcrete girder
dc.subjectreliability
dc.subjectnumerical models
dc.subjectpartial safety factors
dc.subjecttarget reliability index
dc.titlePartial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminateseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Sustainability and Innovation in Structural Engineering
oaire.awardURIhttp://hdl.handle.net/10400.8/14136
oaire.citation.issue1
oaire.citation.titleJournal of Composites for Construction
oaire.citation.volume24
oaire.fundingStreamFinanciamento do Plano Estratégico de Unidades de I&D - 2013/2015 - OE
oaire.versionhttp://purl.org/coar/version/c_ab4af688f83e57aa
person.familyNameFernandes
person.givenNamePaulo
person.identifier.ciencia-idF41A-AFFE-B165
person.identifier.orcid0000-0002-5644-8889
person.identifier.scopus-author-id56701925300
relation.isAuthorOfPublication7375e114-0963-49a2-be76-c52dd45c0338
relation.isAuthorOfPublication.latestForDiscovery7375e114-0963-49a2-be76-c52dd45c0338
relation.isProjectOfPublication93f3c98a-d662-4766-9d8e-341a442b58e2
relation.isProjectOfPublication.latestForDiscovery93f3c98a-d662-4766-9d8e-341a442b58e2

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This paper provides a framework for the calibration of partial safety factors in prestressed concrete (PC) girders strengthened in flexure with carbon fiber-reinforced polymer (CFRP) laminates. A hybrid approach was proposed to take advantage of comprehensive nonlinear numerical models in reliability analysis using a first-order reliability method (FORM) in conjunction with the response surface method (RSM). The PC girders selected for analyses were taken from real structures designed and built in the 1980s based on old standards that now require strengthening and upgrade due to partial corrosion of the prestressing strands. Using the proposed approach, a sensitivity analysis was performed to identify the most relevant variables and assess the area of CFRP laminates needed to restore capacity up to new design standards. A partial safety factor was proposed for strengthening PC girders using CFRP laminates. Sensitivity analysis showed that traffic loads and model uncertainties are the most important variables for calibration.
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