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Performance assessment of flat slabs strengthened with a bonded reinforced-concrete overlay

2018-05-01Artigo científico Acesso aberto
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dc.contributor.authorLapi, Massimo
dc.contributor.authorFernandes, Hugo
dc.contributor.authorOrlando, Maurizio
dc.contributor.authorRamos, António
dc.contributor.authorLúcio, Válter
dc.contributor.institutionDEC - Departamento de Engenharia Civil
dc.contributor.pblThomas Telford Services Ltd
dc.date.accessioned2019-04-08T22:11:58Z
dc.date.available2019-04-08T22:11:58Z
dc.date.issued2018-05-01
dc.description.abstractPunching strengthening of reinforced-concrete slabs using a bonded reinforced-concrete overlay (BRCO) is an efficient alternative to traditional strengthening systems such as post-installed shear reinforcement, enlargement of the support column, or bonded fibre-reinforced polymer strips. The BRCO technique allows for both the flexural stiffness and shear strength of existing slabs to be increased. Shear strength increases due to the greater slab thickness, while an increase in flexural stiffness is also provided by the added reinforcement. Particular attention must be paid to the interface between the existing slab and the BRCO, because performance gains can only be achieved if the existing slab and the new concrete layer work monolithically. Interface performance can be improved through surface preparation and mechanical connectors; the latter is recommended to avoid premature debonding failure. This paper presents an ad hoc design approach for flat slabs strengthened with BRCO based on the critical shear crack theory, which accounts for slab rotation after strengthening. This is a fundamental parameter to assess the punching capacity of the strengthened slab. The efficiency of the proposed method is confirmed by the agreement between analytical results and experimental data collected during an experimental campaign carried out at the Universidade Nova de Lisboa.en
dc.description.versionpreprint
dc.description.versionpublished
dc.format.extent19
dc.format.extent2000239
dc.identifier.doi10.1680/jmacr.17.00037
dc.identifier.issn0024-9831
dc.identifier.otherPURE: 3985474
dc.identifier.otherPURE UUID: 640cb509-a1de-40eb-bcae-3480c4d647dc
dc.identifier.otherScopus: 85045055763
dc.identifier.otherWOS: 000429372900001
dc.identifier.otherORCID: /0000-0001-9496-4991/work/56190646
dc.identifier.otherORCID: /0000-0002-5864-551X/work/64041647
dc.identifier.urihttp://www.scopus.com/inward/record.url?scp=85045055763&partnerID=8YFLogxK
dc.identifier.urlhttps://www.scopus.com/pages/publications/85045055763
dc.language.isoeng
dc.peerreviewedyes
dc.subjectCivil and Structural Engineering
dc.subjectBuilding and Construction
dc.subjectGeneral Materials Science
dc.titlePerformance assessment of flat slabs strengthened with a bonded reinforced-concrete overlayen
dc.typejournal article
degois.publication.firstPage433
degois.publication.issue9
degois.publication.lastPage451
degois.publication.titleMagazine of Concrete Research
degois.publication.volume70
dspace.entity.typePublication
rcaap.rightsrestrictedAccess

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