Influence of quasi-static strain rate on the stress-strain characteristics of modern reinforcing bars
dc.contributor.author
Häfliger, Severin
dc.contributor.author
Fomasi, Sara
dc.contributor.author
Kaufmann, Walter
dc.date.accessioned
2021-04-01T06:41:53Z
dc.date.available
2021-03-29T13:51:48Z
dc.date.available
2021-03-30T04:21:32Z
dc.date.available
2021-04-01T06:41:53Z
dc.date.issued
2021-06-14
dc.identifier.issn
0950-0618
dc.identifier.other
10.1016/j.conbuildmat.2021.122967
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/476816
dc.identifier.doi
10.3929/ethz-b-000476816
dc.description.abstract
While it has been known for decades that even for quasi-static loading, increments in strain rate lead to increased stresses in the inelastic range, this effect is often ignored. However, accurate knowledge of the stress-strain characteristics of reinforcing bars is an indispensable prerequisite for the safe design of new structures and the realistic assessment of the structural safety of existing ones, and the strain rate dependency of the reinforcing steel characteristics should thus be accounted for in many situations. An exemplary case is quality control: Reinforcing bars produced today are periodically tested to check their conformity with specifications, determining their stress-strain characteristics in standard tensile tests. However, the applied quasi-static strain rates may vary considerably, but are not commonly reported. Hence, the results are subject to considerable uncertainty. Another relevant case is the structural safety assessment of existing structures affected by local corrosion of the reinforcement: Their cross section (and hence, stiffness) varies considerably along the bar axis and consequently, the strain rate in corroded sections is significantly higher than in non-corroded sections, leading to higher yield stress and tensile strength.
This study investigates the effect of quasi-static strain rates on the stress–strain characteristics of modern reinforcing bars based on a comprehensive experimental campaign. In four series of experiments, 41 tensile tests on three different types of reinforcing bars were conducted, applying strain rates between 0.004 ‰/s and 1.0 ‰/s. Compared to the static stress, an increase of up to 8% in the dynamic stress was observed, depending on the type of reinforcing bar. Based on these observations, a simplified model for the strain rate dependency was developed and validated against experimental data, showing excellent agreement.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Reinforcing bars
en_US
dc.subject
Strain rate
en_US
dc.subject
Relaxation
en_US
dc.subject
Corrosion
en_US
dc.subject
Local damage
en_US
dc.subject
Pitting
en_US
dc.title
Influence of quasi-static strain rate on the stress-strain characteristics of modern reinforcing bars
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2021-03-24
ethz.journal.title
Construction and Building Materials
ethz.journal.volume
287
en_US
ethz.journal.abbreviated
Constr. Build. Mater.
ethz.pages.start
122967
en_US
ethz.size
7 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::09469 - Kaufmann, Walter / Kaufmann, Walter
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02605 - Institut für Baustatik u. Konstruktion / Institute of Structural Engineering::09469 - Kaufmann, Walter / Kaufmann, Walter
en_US
ethz.relation.isCitedBy
10.3929/ethz-b-000602335
ethz.date.deposited
2021-03-29T13:52:03Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-30T04:21:50Z
ethz.rosetta.lastUpdated
2024-02-02T13:27:28Z
ethz.rosetta.versionExported
true
ethz.COinS
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