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

Chapter 5. Model performance and numerical predictionsFigure 5.1: Test set-up of tensile tests performed by Li et al. [1998] and the correspondinganalysis model.where ρ f is the fiber content and αN ⃗ the orientation factor (assuming the value of 0.405[Soroushian and Lee, 1990]), while A f and A i are the cross-sectional areas of a singlefiber and of the interface, respectively.The tensile tests on SFRC specimens, presented in Li et al. [1998], are firstly considered.Two different kinds of fibers, both with hooked-ends, are utilized as follow:• Dramix steel fibers (diameter d f = 0.5 mm, length l f = 30 mm, density γ f = 7.8g /cm 3 , tensile strength f f u = 1.20 GPa and E f = 200 GPa).• Harex steel fibers (with arched cross section of area = 2.2×0.25 mm 2 , length l f =32 mm, density γ f = 7.8 g /cm 3 , tensile strength f f u = 0.81 GPa and E f = 200GPa).An indirect calibration of the numerical model, previously formulated in Chapter 3, isperformed to identify its parameters. The set of such parameters (i.e., the equivalentelastic modulus of fibers, E d , the equivalent interface elastic limit, σ y,d , and the other94