Angela Muscolino
SCALE EFFECTS ON FRC COMPOSITES: BRITTLE, PERFECTLY-PLASTIC, SOFTENING POST-PEAK REGIMES.
Rel. Alberto Carpinteri, Federico Accornero, Alessio Rubino. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Civile, 2020
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Abstract
In the framework of Fracture Mechanics, the present work aims to analyse the mechanical behaviour of Fiber-Reinforced Concrete (FRC) structural elements subjected to monotonic bending. The Bridged Crack Model is proposed as a Fracture Mechanics based approach able to describe the crack propagation process occurring in the cross-section of FRC structural elements. After a brief introduction, the model’s features are described: the concrete matrix is assumed as elastic-perfectly brittle, whereas the bridging action of the fibers is modelled with suitable constitutive laws, describing the pull-out mechanisms. These mechanisms are defined by pull-out tests results, reported in the scientific literature. On the basis of equilibrium and compatibility conditions, defined in the framework of Linear Elastic Fracture Mechanics, the response of the cracked cross-section is described in terms of applied moment vs localized rotation curve.
Experimental studies reported in the scientific literature suggest to describe the flexural response of FRC beams, by subdividing it into three stages
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