Post-cracking tensile behaviour of steel-fibre-reinforced roller-compacted-concrete for FE modelling and design purposes.

Jafarifar, Naeimeh; Pilakoutas, Kypros; Angelakopoulos, Harris; Bennett, Terry

Abstract

Fracture of steel-fibre-reinforced-concrete occurs mostly in the form of a smeared crack band undergoing progressive microcracking. For FE modelling and design purposes, this crack band could be characterised by a stress-strain (σ-ϵ) relationship. For industrially-produced steel fibres, existing methodologies such as RILEM TC 162-TDF (2003) propose empirical equations to predict a trilinear σ-ϵ relationship directly from bending test results. This paper evaluates the accuracy of these methodologies and their applicability for roller-compacted-concrete and concrete incorporating steel fibres recycled from post-consumer tyres. It is shown that the energy absorption capacity is generally overestimated by these methodologies, sometimes up to 60%, for both conventional and roller-compacted concrete. Tensile behaviour of fibre-reinforced-concrete is estimated in this paper by inverse analysis of bending test results, examining a variety of concrete mixes and steel fibres. A multilinear relationship is proposed which largely eliminates the overestimation problem and can lead to safer designs.

Citation

JAFARIFAR, N., PILAKOUTAS, K., ANGELAKOPOULOS, H. and BENNETT, T. 2017. Post-cracking tensile behaviour of steel-fibre-reinforced roller-compacted-concrete for FE modelling and design purposes. Materiales de construcción [online], 67(326), article ID e122. Available from: https://doi.org/10.3989/mc.2017.06716

• Journal Article Type: Article
• Acceptance Date: Oct 5, 2016
• Online Publication Date: Mar 22, 2017
• Publication Date: Jun 30, 2017
• Deposit Date: Apr 4, 2017
• Publicly Available Date: Apr 4, 2017
• Journal: Materiales de construcción
• Print ISSN: 0465-2746
• Electronic ISSN: 1988-3226
• Publisher: Consejo Superior de Investigaciones Científicas
• Peer Reviewed: Peer Reviewed
• Volume: 67
• Issue: 326
• Article Number: e122
• DOI: https://doi.org/10.3989/mc.2017.06716
• Keywords: Concrete; Composite; Fibre reinforcement; Metal reinforcement; Waste treatment
• Public URL: http://hdl.handle.net/10059/2253
• Contract Date: Apr 4, 2017