Experimental and numerical investigation on the size effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC)

Lampropoulos, Andreas, Nicolaides, Demetris, Paschalis, Spyridon and Tsioulou, Ourania (2021) Experimental and numerical investigation on the size effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC). Materials, 14 (19). p. 5714. ISSN 1996-1944

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In the last few years, there has been increasing interest in the use of Ultrahigh-Performance Fibre-Reinforced Concrete (UHPFRC) layers or jackets, which have been proved to be quite effective in strengthening applications. However, to facilitate the extensive use of UHPFRC in strengthening applications, reliable numerical models need to be developed. In the case of UHPFRC, it is common practice to perform either direct tensile or flexural tests to determine the UHPFRC tensile stress–strain models. However, the geometry of the specimens used for the material characterization is, in most cases, significantly different to the geometry of the layers used in strengthening applications which are normally of quite small thickness. Therefore, and since the material properties of UHPFRC are highly dependent on the dimensions of the examined specimens, the so called “size effect” needs to be considered for the development of an improved modelling approach. In this study, direct tensile tests have been used and a constitutive model for the tensile behaviour of UHPFRC is proposed, taking into consideration the size of the finite elements. The efficiency and reliability of the proposed approach has been validated using experimental data on prisms with different geometries, tested in flexure and in direct tension.

Item Type: Article
Identifier: 10.3390/ma14195714
Additional Information: This is the version of record of the following article: [Lampropoulos, A.; Nicolaides, D.; Paschalis, S.; Tsioulou, O. Experimental and Numerical Investigation on the Size Effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC). Materials 2021, 14, 5714. https:// doi.org/10.3390/ma14195714], which has been published in final form by MDPI at https://doi.org/10.3390/ma14195714.
Keywords: UHPFRC; strengthening; flexural strength; size effect; constitutive stress–strain model; numerical modelling
Subjects: Construction and engineering
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Depositing User: Spyridon Paschalis
Date Deposited: 03 Nov 2021 13:47
Last Modified: 06 Feb 2024 16:07
URI: https://repository.uwl.ac.uk/id/eprint/8398


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