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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

Authors

Naeimeh Jafarifar

Kypros Pilakoutas

Harris Angelakopoulos

Terry Bennett

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 (?-?) relationship. For industrially-produced steel fibres, existing methodologies such as RILEM TC 162-TDF (2003) propose empirical equations to predict a trilinear ?-? 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.

Journal Article Type Article
Publication Date Jun 30, 2017
Journal Materiales de construccion
Print ISSN 0465-2746
Electronic ISSN 1988-3226
Publisher New Publisher Required
Peer Reviewed Peer Reviewed
Volume 67
Issue 326
Article Number e122
Institution 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 construccion [online], 67(326), article ID e122. Available from: https://doi.org/10.3989/mc.2017.06716
DOI https://doi.org/10.3989/mc.2017.06716
Keywords Concrete; Composite; Fibre reinforcement; Metal reinforcement; Waste treatment

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