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Impact of the variability of material constitutive models on the thermal response of reinforced concrete walls

Karaki, Ghada; Hawileh, Rami A.; Naser, M. Z.

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Authors

Ghada Karaki

Rami A. Hawileh

M. Z. Naser



Abstract

Purpose: This study examines the effect of temperature-dependent material models for normal-strength (NSC) and high-strength concrete (HSC) on the thermal analysis of reinforced concrete (RC) walls. Design/methodology/approach: The study performs an one-at-a-time (OAT) sensitivity analysis to assess the impact of variables defining the constitutive and parametric fire models on the wall's thermal response. Moreover, it extends the sensitivity analysis to a variance-based analysis to assess the effect of constitutive model type, fire model type and constitutive model uncertainty on the RC wall's thermal response variance. The study determines the wall’s thermal behaviour reliability considering the different constitutive models and their uncertainty. Findings: It is found that the impact of the variability in concrete’s conductivity is determined by its temperature-dependent model, which differs for NSC and HSC. Therefore, more testing and improving material modelling are needed. Furthermore, the heating rate of the fire scenario is the dominant factor in deciding fire-resistance performance because it is a causal factor for spalling in HSC walls. And finally the reliability of wall's performance decreased sharply for HSC walls due to the expected spalling of the concrete and loss of cross-section integrity. Originality/value: Limited studies in the current open literature quantified the impact of constitutive models on the behaviour of RC walls. No studies have examined the effect of material models' uncertainty on wall’s response reliability under fire. Furthermore, the study's results contribute to the ongoing attempts to shape performance-based structural fire engineering.

Citation

Karaki, G., Hawileh, R. A., & Naser, M. Z. (in press). Impact of the variability of material constitutive models on the thermal response of reinforced concrete walls. Journal of Structural Fire Engineering, https://doi.org/10.1108/JSFE-06-2023-0027

Journal Article Type Article
Acceptance Date Mar 9, 2024
Online Publication Date Apr 22, 2024
Deposit Date Jun 10, 2024
Publicly Available Date Jun 11, 2024
Journal Journal of Structural Fire Engineering
Print ISSN 2040-2317
Electronic ISSN 2040-2325
Publisher Emerald
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1108/JSFE-06-2023-0027
Public URL https://uwe-repository.worktribe.com/output/12039044

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Impact of the variability of material constitutive models on the thermal response of reinforced concrete walls (905 Kb)
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Copyright Statement
Copyright © 2024, Emerald Publishing Limited. This AAM is provided for your own personal use only. It may not be used for resale, reprinting, systematic distribution, emailing, or for any other commercial purpose without the permission of the publisher


Impact of the variability of material constitutive models on the thermal response of reinforced concrete walls (849 Kb)
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Licence
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Copyright © 2024, Emerald Publishing Limited. This AAM is provided for your own personal use only. It may not be used for resale, reprinting, systematic distribution, emailing, or for any other commercial purpose without the permission of the publisher






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