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Span-to-depth ratio limits for RC continuous beams and slabs based on MC2010 and EC2 ductility and deflection requirements

2021Journal article Open access
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dc.contributor.authorSantos, José
dc.contributor.authorHenriques, António Abel
dc.date.accessioned2022-03-15T14:32:51Z
dc.date.available2022-03-15T14:32:51Z
dc.date.issued2021
dc.description.abstractIn the design of reinforced concrete structures several limit states are usually verified using simplified methods instead of using complex direct calculation. Span-to-depth ratio limits are applied for deflection control. In the same way, a redistribution factor and the relative depth of the compression zone are applied for the required ductility, but this is not enough. In fact, specific span-to-depth ratio limits, which are developed in this paper, should also complement the conditions referred to here. A numerical study is developed to compute the deflection ductility index of a wide range of continuous beams (or one-way slabs) considering as ultimate point when the rotation capacity (given by MC2010 and EC2) is achieved. From the boundary between fragile and ductile failures, the new span-to-depth ratio limits for the required ductility are defined and compared with the existing similar limits for deflection control. The results indicate that: (i) for normal strength concrete (up to 50 MPa), the ductility limit is more restrictive than the deflection limit when the redistribution factor δ is lower than 0.9, being always more restrictive for high strength concrete; (ii) for the current building beams, the slenderness used (10 < l/d < 20) allows ductile fail ures, while for typical building slabs (low reinforcement ratio, but high redistribution), the slenderness should be l/d ≤ 20; (iii) the conditions of MC2010 and EC2 to use plastic analysis without any direct check of the rotation capacity are actually incomplete and need to be revised. The new span-to-depth ratio limits proposed in this paper, which satisfy both ductility and deflection requirements, depend on the redistribution factor, characteristic compressive strength of concrete and total mechanical reinforcement ratiopt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSantos, J., & Henriques, A. A. (2021). Span-to-depth ratio limits for RC continuous beams and slabs based on MC2010 and EC2 ductility and deflection requirements. Engineering Structures, 228, 111565. https://doi.org/10.1016/j.engstruct.2020.111565pt_PT
dc.identifier.doi10.1016/j.engstruct.2020.111565pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4144
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstitute of R&D in Structures and Construction
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectContinuous beamspt_PT
dc.subjectContinuous slabspt_PT
dc.subjectDeflection controlpt_PT
dc.subjectDeflection ductility indexpt_PT
dc.subjectEurocode 2pt_PT
dc.subjectModel Code 2010pt_PT
dc.subjectPre-designpt_PT
dc.subjectRequired ductilitypt_PT
dc.subjectRotation capacitypt_PT
dc.subjectSlenderness ratiopt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleSpan-to-depth ratio limits for RC continuous beams and slabs based on MC2010 and EC2 ductility and deflection requirementspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute of R&D in Structures and Construction
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04708%2F2020/PT
oaire.citation.startPage111565pt_PT
oaire.citation.titleEngineering Structurespt_PT
oaire.citation.volume228pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMARTINS NETO DOS SANTOS
person.givenNameJOSÉ MANUEL
person.identifier.ciencia-idDE1C-64E5-4284
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscoveryabd4b512-8c9b-428c-be89-229c06afb6b8
relation.isProjectOfPublicationabd7f324-6515-4266-9436-ffcb0514f942
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