In this paper, the Lattice Discrete Particle Model (LDPM) is extended to include the effect of dispersed fibers with the objective of simulating the behavior of fiber reinforced concrete for armoring system applications. Within the LDPM framework, the effect of dispersed fibers is taken into account through the following procedure. 1) Fibers are randomly placed in the volume of interest according to the given fiber volume ratio and fiber geometry; 2) the number and orientation of fibers crossing each facet are computed along with the fiber embedment length on each side of the facet; 3) at the facet level, fibers and plain concrete are assumed to be coupled in parallel; 4) the contribution of each fiber to the facet response is formulated on the basis of a micromechanical model of fiber-matrix interaction. The developed model, named LDPM-F, is validated by carrying out numerical simulations of direct tension and three-point bending tests on fiber reinforced concrete mixes characterized by various fiber volume fractions. Finally, LDPM-F is applied to the analysis of the penetration resistance of fiber reinforced slabs.
MESO-STRUCTURAL MODELLING OF FIBRE REINFORCED CONCRETE / Cusatis G.; Buratti N.; Savoia M.. - STAMPA. - 1:(2010), pp. 275-283. (Intervento presentato al convegno 18° Congresso del Collegio dei Tecnici della Industrializzazione Edilizia (C.T.E.) tenutosi a Brescia nel 11-13 Novembre).
MESO-STRUCTURAL MODELLING OF FIBRE REINFORCED CONCRETE
BURATTI, NICOLA;SAVOIA, MARCO
2010
Abstract
In this paper, the Lattice Discrete Particle Model (LDPM) is extended to include the effect of dispersed fibers with the objective of simulating the behavior of fiber reinforced concrete for armoring system applications. Within the LDPM framework, the effect of dispersed fibers is taken into account through the following procedure. 1) Fibers are randomly placed in the volume of interest according to the given fiber volume ratio and fiber geometry; 2) the number and orientation of fibers crossing each facet are computed along with the fiber embedment length on each side of the facet; 3) at the facet level, fibers and plain concrete are assumed to be coupled in parallel; 4) the contribution of each fiber to the facet response is formulated on the basis of a micromechanical model of fiber-matrix interaction. The developed model, named LDPM-F, is validated by carrying out numerical simulations of direct tension and three-point bending tests on fiber reinforced concrete mixes characterized by various fiber volume fractions. Finally, LDPM-F is applied to the analysis of the penetration resistance of fiber reinforced slabs.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
