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Innovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zones

2022-12-30Artigo científico Acesso aberto
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dc.contributor.authorGião, Rita
dc.contributor.authorLúcio, Válter
dc.contributor.authorChastre, Carlos
dc.contributor.institutionCERIS - Polo NOVA
dc.contributor.institutionDEC - Departamento de Engenharia Civil
dc.contributor.pblMDPI - Multidisciplinary Digital Publishing Institute
dc.date.accessioned2023-03-17T22:31:20Z
dc.date.available2023-03-17T22:31:20Z
dc.date.issued2022-12-30
dc.descriptionPublisher Copyright: © 2022 by the authors.
dc.description.abstractThe seismic performance of a structural frame system can be enhanced by strengthening the RC beams’ critical zones. In this paper is presented an experimental study on the improvement of the beam behaviour, subjected to an alternative cyclic procedure which considers the gravity loads reflecting the real demands on the beams’ critical zone. Two strengthening solutions are presented: unbounded post-tension (PT) tendon strengthening to increase resistance and limit residual deformations, and unbounded post-tensioning with jacketing of the RC beam with unidirectional fibre mat reinforced grout (UFRG) to limit compression damage, improving section confinement, thus delaying concrete crushing and buckling of longitudinal reinforcement. The original UFRG material was developed within this study, to apply as a small thickness jacketing material for strengthening RC structures. The main idea was that the steadiness provided by preplacing continuous fibre mats into the mould reduced the fibres’ segregation tendency during the high-performance grout pouring and allowed for the optimisation of their percentage and alignment, attaining a higher tensile strength. The experimental response of the tested Specimens is presented and evaluated through performance parameters that are properly discussed and adjusted to the alternative cyclic procedure. Finally, theoretical predictions are presented, and an adjustable multilinear model is proposed to estimate the strengthening solution’s response.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent20
dc.format.extent10475512
dc.identifier.doi10.3390/buildings13010095
dc.identifier.issn2075-5309
dc.identifier.otherPURE: 56218327
dc.identifier.otherPURE UUID: 3ba52e8f-a245-48ca-a2be-6c5eb4664388
dc.identifier.otherScopus: 85146504419
dc.identifier.otherWOS: 000914802200001
dc.identifier.otherORCID: /0000-0002-5864-551X/work/131067143
dc.identifier.otherORCID: /0000-0002-7708-6995/work/131067283
dc.identifier.urihttp://hdl.handle.net/10362/150801
dc.identifier.urlhttps://www.scopus.com/pages/publications/85146504419
dc.language.isoeng
dc.peerreviewedyes
dc.relationFunding Information: info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04625%2F2020/PT
dc.subjectcyclic experimental test
dc.subjectfibre reinforced concrete
dc.subjectgravity load
dc.subjectjacketing
dc.subjectpost-tension
dc.subjectRC beam critical zone
dc.subjectretrofit
dc.subjectArchitecture
dc.subjectCivil and Structural Engineering
dc.subjectBuilding and Construction
dc.titleInnovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zonesen
dc.typejournal article
degois.publication.issue1
degois.publication.titleBuildings
degois.publication.volume13
dspace.entity.typePublication
rcaap.rightsopenAccess

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