tesi A. Caggiano.pdf - EleA@UniSA - Università degli Studi di Salerno

Chapter 6. Structural scale failure analysis of FRCCFigure 6.14: Crack paths of plain concrete and SFRC under three-point bending with centricalnotch by Carpinteri and Brighenti [2010].Table 6.2: Material parameters employed in the mesoscale analyses.ContinuumAggregatesContinuumMortarsContinuumFibersAggregate − MatrixInterfaceSFRC − SFRCInterfaceFiberBond − SlipFiberDowelk N [MPa/mm]1.E + 06c 0 [MPa]4.8G I I [N /mm]f1.200k N [MPa/mm]1.E + 06c 0 [MPa]5.6G I I [N /mm]f2.000ρ A E A [GPa] ν A28% 60.00 0.20ρ M E M [GPa] ν M72% 19.15 0.20ρ F E F [MPa] ν F0 − 0.25% − 0.50% 200.00 0.30k T [MPa/mm]1.E + 06t g φ 0 − t g φ r − t g β0.4 − 0.1 − 0.3σ di l [MPa]10.0k T [MPa/mm]1.E + 06t g φ 0 = t g φ r = t g β0.5 − 0.2 − 0.4σ di l [MPa]10.0χ 0 [MPa]2.4G I [N /mm]f0.120α χ−0.15χ 0 [MPa]3.2G I [N /mm]f0.200α χ−0.15τ y,a [MPa] k E [MPa/mm] k S [MPa/mm] l f [mm]6.95 100.0 0.1 44.0k dow d f [mm] f ′ c [MPa] σ y,s [MPa]2.8 0.98 40.0 800.0Figures 6.14 and 6.16 illustrate the cracked configurations at ultimate stages as obtainedin the experimental tests by Carpinteri and Brighenti [2010] and in the numericalsimulations. In both cases, failure process leads to only one macro-crack, starting at128