Issue 54

F. Benaoum et al, Frattura ed Integrità Strutturale, 54 (2020) 282-296; DOI: 10.3221/IGF-ESIS.54.20

N OMENCLATURE

a

Crack length

B

Thickness of the specimen Fiber-reinforced polymers Carbon fiber-reinforced polymers Hybrid fiber-reinforced polymers

FRP CFRP HFRP

Ds

The space between the beam boundary and the support

Glue layer thickness Patch layer thickness

e a e P

E c = E 1

Concrete Young’s modulus Steel young’s modulus Glue layer Young’s modulus Carbon fibers Young’s modulus

E s E a E 2 F V

Fractional fiber volume

f c concrete compressive strength F V (100% -50%) Orientation rate of the volume fraction from 50% to 100% F V (0% -100%) Orientation rate of the volume fraction from 0% to 100% F V (100% -0%) Orientation rate of the volume fraction from 100% to 0% G 1 The transverse shear modulus of adherents 1 G 2 The transverse shear modulus of adherents 2 K b Initial elastic stiffness of the FRP-concrete interface U Displacement U x Displacement following the x axis U z Displacement following the Z axis τ f Shear strength of the interface W Height of the concrete specimen L length of the concrete specimen G F Fracture energy for Bažant’s model f G Fracture energy for cohesive crack model

296