Shear Database and Study of the Parameters Influencing Shear Behavior - On Shear Behavior of Structural Elements Made of Steel Fiber Reinforced Concrete - page 161

Table 8.14 (continued)
Parameter Neither bers

nor stirrups

Beams only with
stirrups

Beams only
with bers

Beams with
bers and
stirrups

d < 900 mm
similar SM are
obtained

a/d EHE08: For the

same a/d pre-
stressed beams
are more
conservative
MC2010 and
RILEM: For the
same a/d (when
a/d ≥ 4),
reinforced and
prestressed
elements
have ≈ SM

(No trends for the
analyzed range
2.5

- -

≤ a/d ≤ 3.5)

f cm (MPa) - For f c > 70 MPa, SM

are unconservative

Reinforced beams
with f c > 70 MPa,
present low SM

-

f R3 (MPa) Reinforced beams

with f R3 > 5 MPa,
present low SM

EHE08 is the
most conserva-
tive for rein-
forced beams.
For prestressed
RILEM is the
safest. MC2010
is the most bal-
anced Code
(similar SM for
reinforced and
prestressed)

- -

Amount of For amount of

bers > 125 kg/m 3 ,
Codes are safe
(SM > 1)

bers (kg/m 3 ) -

- -

ρ (%) In prestressed

beams, SM
increase with

EHE08 and RILEM:
No trends are
observed for rein-
forced beams. For
prestressed, shear
stress increases with
ρ

Reinforced
beams with
p > 2 % and
f R3 < 1.5 have
SM <1.
MC2010 is the
most balanced
for reinforced
and prestressed
beams
(continued)

-

ρ

for ρ ≤ 2 %. For

ρ ≫ 2 % SM in

prestressed
beams increases
quickly

. MC2010: when

ρ > 5 %, prestressed

is underestimated