TY - JOUR
T1 - Incorporation of micro-cracking and fibre bridging mechanisms in constitutive modelling of fibre reinforced concrete
AU - Le, Linh A.
AU - Nguyen, Giang D.
AU - Bui, Ha H.
AU - Sheikh, Abdul H.
AU - Kotousov, Andrei
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The formation and propagation of cracks under progressive loading in fibre reinforce concrete (FRC) are significantly influenced by fibre bridging mechanisms. Cracking and fibre bridging, governed by the FRC constituents and their properties, are two coupled and interacting phenomena that significantly affect the ductility and transition from diffuse to localised deformation. Constitutive modelling of FRC is challenging due to the high inhomogeneity and complex transition of deformations stages rooted from the difference in responses of cracked and intact material volumes coupled with cohesive resistance and fibre bridging of a crack. In this paper, a new approach to constitutive modelling of FRC is developed by enriching the constitutive structure to accommodate different responses of the crack, intact material and fibres. The strain discontinuity caused by cracks is accounted for via an enriched strain field which facilitates the introduction of the two interacting mechanisms, cohesive cracking and fibre bridging, in the constitutive model. The transition from diffuse to localised deformation is controlled by the fibre volume content and local deformation, via the density of active cracks. It is demonstrated that the proposed constitutive model is capable of describing the transition from diffuse to localised deformation associated with different macro responses under different loading conditions.
AB - The formation and propagation of cracks under progressive loading in fibre reinforce concrete (FRC) are significantly influenced by fibre bridging mechanisms. Cracking and fibre bridging, governed by the FRC constituents and their properties, are two coupled and interacting phenomena that significantly affect the ductility and transition from diffuse to localised deformation. Constitutive modelling of FRC is challenging due to the high inhomogeneity and complex transition of deformations stages rooted from the difference in responses of cracked and intact material volumes coupled with cohesive resistance and fibre bridging of a crack. In this paper, a new approach to constitutive modelling of FRC is developed by enriching the constitutive structure to accommodate different responses of the crack, intact material and fibres. The strain discontinuity caused by cracks is accounted for via an enriched strain field which facilitates the introduction of the two interacting mechanisms, cohesive cracking and fibre bridging, in the constitutive model. The transition from diffuse to localised deformation is controlled by the fibre volume content and local deformation, via the density of active cracks. It is demonstrated that the proposed constitutive model is capable of describing the transition from diffuse to localised deformation associated with different macro responses under different loading conditions.
KW - Cohesive crack
KW - Constitutive modelling
KW - Fibre bridging
KW - Fibre reinforced concrete (FRC)
UR - http://www.scopus.com/inward/record.url?scp=85072887954&partnerID=8YFLogxK
U2 - 10.1016/j.jmps.2019.103732
DO - 10.1016/j.jmps.2019.103732
M3 - Article
AN - SCOPUS:85072887954
VL - 133
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
SN - 0022-5096
M1 - 103732
ER -