Issue 64

A. Abdo et alii, Frattura ed Integrità Strutturale, 64 (2023) 148-170; DOI: 10.3221/IGF-ESIS.64.10

can be concluded that beams with a 2% fiber content and a 30% fly ash content have the highest total energy dissipation when compared to other beams.

1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 0 3 6 9 121518212427303336394245 Secant stiffness (kN/mm) Diflection (mm) 0 FA-0 F 30%FA-1%F 30%FA-2%F 30%FA-3%F 30%FA-4%F

1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 0 3 6 9 121518212427303336394245 Secant stiffness (kN/mm) Diflection (mm) 0 FA-0 F 15%FA-1%F 15%FA-2%F 15%FA-3%F 15%FA-4%F

(a)

(b)

1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 0 3 6 9 121518212427303336394245 Secant stiffness (kN/mm) Diflection (mm) 0 FA-0 F 45%FA-1%F 45%FA-2%F 45%FA-3%F 45%FA-4%F

(c) Figure 10: The secant stiffness of tested beams: (a) group1, (b) group2, and (c) group3

2,5

2

1,5

15% FA 30% FA 45% FA

1

(kN/mm)

0,5

Stiffness for first cycle

0

0% 1% 1% 2% 2% 3% 3% 4% 4% 5%

Steel fiber Vf %

Figure 11: The effect of steel fiber volume fraction and fly ash on the stiffness for the first cycle.

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