A Novel Mesoscopic Model for Simulating the Mechanical Behavior of Fiber Reinforced Concrete Composites (FRCCs)

Memoria tratta da "The New Boundaries of Structural Concrete: Session C - New Scenarios for Concrete", ACI IC - Ancona 2011

A novel constitutive theory is presented in this paper to model the non-linear response of fiber reinforced concrete composites (FRCCs). A FRC Mortar - Mortar fracture- ased interface formulation is used to simulate the failure behavior of FRCC at mesoscopic level of observations. This novel interface model considers a quadratic hyperbolic criterion for simulating the interaction between shear and normal stresses at the interface resulting in crack initiation. The well-known “Mixture Theory” is adopted for modeling the mortar-mortar interfaces taking into account the action of fibers (made out of either steel or plastics) crossing the above mentioned interfaces. Both the axial force induced on fibers by relative displacements orthogonal to the plane of the joint and the dowel action deriving by transverse displacements are considered. Finally, the proposed model is validated by comparing its numerical predictions with experimental results available in the scientific literature.

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