Stress relaxation of concrete beams caused by creep and shrinkage effects

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dc.contributor.authorJindra, Danielcs
dc.contributor.authorHradil, Petrcs
dc.contributor.authorKala, Jiřícs
dc.coverage.issue1cs
dc.coverage.volume396cs
dc.date.accessioned2025-02-03T14:45:40Z
dc.date.available2025-02-03T14:45:40Z
dc.date.issued2024-05-24cs
dc.description.abstractShrinkage and creep are two important physical properties of concrete material which cause increase of the deformation of the constantly loaded structure over long period of time, the feature known as rheology. Additional deformation of concrete structures at the end of the design working period (most commonly 50 years) caused by these phenomena is circa three times larger than the value of the immediate elastic deformation (or even larger in some cases). Hence, in accordance with the corresponding European standard, these effects should be taken in account while evaluating the serviceability limit state of concrete structures, and if significant, consideration of these phenomena is also needed for the verification of the ultimate limit state. In concrete material, creep occurs at all stress levels, and is dependent on many parameters, as cement class, concrete grade, relative humidity of the environment, surface of the structure in contact with the ambient air (drying surface), and the age of concrete (after casting) at the loading moment. Shrinkage of the concrete is independent on loading. It is caused by decrease of the pore water content in the hardened concrete, and is predominantly dependent on the ambient relative humidity. Relaxation describes stress reduction at a constant material strain, usually in prestressing steel tendons. In this study, the physical experiments of multiple concrete beams over time with respect to rheological processes are described. Each experimental system consists of two C35/45 beams horizontally bounded by a prestressed steel cylinder. Decrease of these pretension forces in cylinders over time have been monitored (stress relaxation). All together time histories of two forces are documented, based on measurements conducted in interior environment of an agricultural building. The experimental time histories of the pretension forces are then compared with the results of the finite element numerical analyses conducted in ANSYS software. Creep and shrinkage effects of the concrete material have been considered based on the corresponding European standard for design of the concrete structures. The time-histories of the forces in prestressed cylinders obtained from the numerical simulations are then compared with the experimental data, and discussed. It is concluded, that the estimation of the force decrease over analysed time with the creep and shrinkage effects considered according to the corresponding European standard appears to be slightly larger than the experimentally measured decrease of the force value, hence the assumption is more conservative.en
dc.formattextcs
dc.format.extent1-9cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMATEC Web of Conferences. 2024, vol. 396, issue 1, p. 1-9.en
dc.identifier.doi10.1051/matecconf/202439605018cs
dc.identifier.issn2261-236Xcs
dc.identifier.orcid0000-0002-9512-2558cs
dc.identifier.orcid0000-0002-3915-9399cs
dc.identifier.orcid0000-0002-8250-8515cs
dc.identifier.other189864cs
dc.identifier.researcheridE-6326-2019cs
dc.identifier.scopus8525142300cs
dc.identifier.urihttps://hdl.handle.net/11012/249939
dc.language.isoencs
dc.publisherEDP Sciencescs
dc.relation.ispartofMATEC Web of Conferencescs
dc.relation.urihttps://www.matec-conferences.org/articles/matecconf/abs/2024/08/matecconf_wmcaus2023_05018/matecconf_wmcaus2023_05018.htmlcs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2261-236X/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectConcreteen
dc.subjectcreepen
dc.subjectstress relaxationen
dc.subjectrheologyen
dc.titleStress relaxation of concrete beams caused by creep and shrinkage effectsen
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-189864en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:45:40en
sync.item.modts2025.01.29 23:31:59en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav stavební mechanikycs
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