Torelli, G. orcid.org/0000-0002-0607-695X, Gillie, M., Mandal, P. et al. (2 more authors) (2020) A moisture-dependent thermomechanical constitutive model for concrete subjected to transient high temperatures. Engineering Structures, 210. 110170. ISSN 0141-0296
Abstract
This paper presents a constitutive model for concrete able to capture the effects of the moisture content of the material on its mechanical behaviour under compressive loads and high transient temperatures. The model is the first to account for the experimentally demonstrated effect of moisture content on the two components of thermal strain, Load Induced Thermal Strain (LITS) and Free Thermal Strain (FTS). Both LITS and FTS are formulated as functions of the water content of the material at the beginning of the thermal transient. First, the theoretical formulation and numerical implementation of the model are presented. Then, the model is verified and validated against published transient tests on concrete specimens having different initial moisture contents. Finally, it is employed to assess a nuclear pressure vessel subjected to fault conditions. The results show that the model allows the moisture dependent behaviour of concrete heated under mechanical load to be accurately captured. Furthermore, it is shown the introduction of moisture-dependent thermal strain components is crucial to capture the behaviour of nuclear pressure vessels subjected to fault conditions. If the moisture-dependency of thermal strain of concrete is not considered, non-conservative results may be obtained.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Elsevier Ltd. This is an author produced version of a paper subsequently published in Engineering Structures. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Concrete; Temperature; Fire; Load-induced thermal strain; Transient thermal creep; Thermal strain; Stress confinement; Modelling; Moisture |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Jan 2020 13:33 |
Last Modified: | 28 Feb 2021 01:38 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.engstruct.2020.110170 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:155594 |
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