n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - A computational model for strain-hardening fibre-reinforced cement-based composites : technical paper
|Article Title||A computational model for strain-hardening fibre-reinforced cement-based composites : technical paper|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese|
|Author||W.P. Boshoff and G.P.A.G. Van Zijl|
|Publication Date||Jun 2007|
|Pages||24 - 31|
|Keyword(s)||Computational model, Concrete, Damage, Fibre, and Strain-hardening,|
The development of a computational model based on a computational continuum damage formulation for a class of strain-hardening fibre-reinforced cement-based composites (SHCC) is reported on. Particular features of SHCC mechanical behaviour, namely multiple cracking at increasing stress levels with successive cracking, and eventual failure at a single crack, require incorporation of strain-hardening and strain-softening beyond threshold levels of damage evolution. A localisation zone length scale is incorporated, related to the physical failure phenomenon of fibre pull-out in the final failure crack in SHCC. Thereby, the computational solution is regularised, causing it to become finite element mesh size-independent. A novel equivalent strain criterion is formulated, whereby the predominantly tensile (mode 1)-dominated damage formulation is improved to also capture shear-dominated (mode 2) failure with reasonable accuracy. The model is verified by finite element analysis of flexural and shear laboratory experiments performed at the Institute for Structural Engineering, University of Stellenbosch.
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