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
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|
|Publisher||New Publisher Required|
|Peer Reviewed||Peer Reviewed|
|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|
|Keywords||Concrete; Composite; Fibre reinforcement; Metal reinforcement; Waste treatment|
JAFARIFAR 2017 Post-cracking tensile behaviour