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Evaluation of retention stresses of prestressing bars of a concrete ribbed panel from agricultural building after 20 years of service

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dc.contributor.authorKiviste, Mihkel
dc.contributor.authorLille, Harri
dc.contributor.authorLinnus, Lauri
dc.contributor.authorHalgma, Riho
dc.contributor.departmentEstonian University of Life Sciences. Institute of Forestry and Rural Engineering. Chair of Rural Building and Water Managementeng
dc.date.accessioned2019-04-24T10:09:03Z
dc.date.available2019-04-24T10:09:03Z
dc.date.issued2019
dc.descriptionArticleeng
dc.description.abstractIn Estonian agricultural buildings there exist a lot of precast concrete load-bearing structures, which were manufactured in the 1970s and 80s. By now, some of these are rather near for reaching their designed service life. 20 years old prestressed concrete ribbed ceiling panels (type PNS-12) with the dimensions of 6 m (length) by 1.5 m (width) from an existing agricultural building (pigsty) are the subject of current study. The objective of current study was to evaluate the retention stress of prestressing bars (PSBs) of a ribbed panel PNS-12. In other words the purpose was to find out how much of the factory-issued initial prestress was left at the PSBs after 20 years of service. As a novel application in civil engineering strain gauges were applied in the evaluation of retention stress of PSBs in current study. The active strain gauges were glued to the opposite sides of PSBs at the middle-span of the ribbed panel, dummy gauges were glued to the unloaded steel slab. Strain gauges were connected to the half-bridge and measured with strain indicator and recorded. Retention stresses were calculated using the Hooke’s law through the measured strains and elastic modulus of steel. Elastic modulus of PSBs was also measured using the universal testing machine Instron 3369 and software Bluehill 2, based on two standards. The results demonstrated about 20.8% and 10.0% of retention stress of PSBs, respectively. The possible errors created by different aspects in experiment are also discussed.eng
dc.identifier.issn1406-894X
dc.identifier.publicationAgronomy Research, 2019, vol. 17, no. 6, pp. 2277–2285eng
dc.identifier.urihttp://hdl.handle.net/10492/4703
dc.identifier.urihttps://doi.org/10.15159/ar.19.066
dc.rights.holderCopyright 2009 by Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry. No part of this publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, incl. photocopying, electronic recording, or otherwise without the prior written permission from the Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry.eng
dc.subjectretention stresseng
dc.subjectprecasteng
dc.subjectprestressedeng
dc.subjectconcreteeng
dc.subjectribbed paneleng
dc.subjectarticleseng
dc.titleEvaluation of retention stresses of prestressing bars of a concrete ribbed panel from agricultural building after 20 years of serviceeng
dc.typeArticleeng

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2019, Vol. 17, No. 6