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

6.1. Influence of the interface positions at structural scale(a)load [kN]5.04.03.02.0ρ f = 5 %ρ f = 2 %ρ f = 5 %(b)(c)load [kN]load [kN]1.0ρ f = 0 % ρ f = 0 %0.00.000 0.005 0.010displacement [mm]5.0ρ f = 5 %4.0ρ f = 5 %3.0ρ f = 2 %2.0ρ f = 0 %1.0ρ f = 0 %0.00.000 0.005 0.010displacement [mm]5.0ρ f = 5 %ρ4.0f = 5 %3.0ρ f = 2 %2.01.0ρ f = 0 % ρ f = 0 %0.00.000 0.005 0.010displacement [mm]Figure 6.3: Vertical load-displacement behavior of plain concrete and SFRCs under tension(left side) and crack paths (right side).Figures 6.3-6.6 show the force-displacement curves obtained at the loaded of thenumerical models depicted in Figures 6.1 and 6.2. It can be observed that the loaddisplacementresponses on the analyzed concrete composite samples are significantlyinfluenced by fiber reinforcement on both structural strength and post-peak behavior.Fiber bridging effects on cracked concrete are realistically captured by the considereddiscontinuous-based approach. Actually, the post-peak response of fiber-reinforcedconcrete is much more ductile than that of plain concrete. Figures 6.3-6.6 also illustratethe cracked configurations at ultimate stages by means of the numerical simulations.117