Civil Engineering Reference
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Case 3 (ONLY FIBERS). Beams ordered by
2.50
7.00
CONSERVATIVE
2.25
6.00
2.00
5.00
1.75
4.00
1.50
3.00
1.25
2.00
1.00
1.00
0.75
UNCONSERVATIVE
0.50
0.00
rho (Reinforced beams)
rho (Prestressed beams)
SM (EHE-08)
SM (MC2010)
SM (RILEM)
Case 4 (STIRRUPS + FIBERS). Beams ordered by
2.00
4.00
CONSERVATIVE
3.50
1.75
3.00
1.50
2.50
1.25
2.00
1.50
1.00
1.00
0.75
0.50
UNCONSERVATIVE
0.50
0.00
rho (Reinforced beams)
rho (Prestressed beams)
SM (EHE-08)
SM (MC2010)
SM (RILEM)
Fig. 8.47
(continued)
It has been observed that Codes overestimate the shear strength of beams made
of high strength concrete (f
c
> 70 MPa). Therefore, structural codes should
provide rules that take into account the shear strength, when f
c
> 70 MPa, as
does the EHE when limits the compressive strength (f
c
≤
60 MPa) and the
bers ((f
ck
)
1/2
MC2010 for elements without
8 MPa). In fact, the Model Code
ensures that its limitation in f
ck
is provided due to the larger observed variability
in shear strength of higher strength concrete, particularly for members without
stirrups. However, concrete compressive strength also in
≤
fl
uences the FRC
toughness.
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