Literature Survey on Shear in FRC Beams - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 30

3.10.1.2 RILEM Current Version 2003

The formulation to calculate shear strength in beams made with FRC according to
the current version of RILEM (2003) [ 77 ] is:

V ¼ V c þ V s þ V f ð 3 : 20 Þ

h i b d

1 = 3

V c ¼ 0 : 12 n ð 100 q l f ck Þ þ 0 : 15 r c ð 3 : 21 Þ

In the case of prestressing “ h ” should be used instead of “ d ” in formula

(Eq. 3.21 ) with:

r

200
d

n ¼ 2

A s
bd 0

q l ¼ : 02

N sd
A c 0

r c ¼ : 02

The second term, V s , is also identical as in Eurocode 2 (assuming ʸ =45 ° )

A sw
s

V s ¼ 0 : 9 d f ywd 1 þ cot a ð Þ sin a ð 3 : 22 Þ

V f ¼ 0 : 7 k f n s fd b d ð 3 : 23 Þ

with:

s fd ¼ 0 : 12 f R ; 4 ð 3 : 24 Þ

τ fd design value of the increase in shear strength due to steel bers;

k f factor for taking into account the contribution of the fl anges in a T-section:

h f
d

;

h f
b w

k f ¼ 1 þ n k f 1 : 5

b f b w
h f

3b w
h f

n ¼ 3 n

;

with:
h f

height of the fl anges;

b f width of the fl anges;