Civil Engineering Reference
In-Depth Information
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)
Case 4 (STIRRUPS + FIBERS). Beams ordered by f
R3
2.00
12.00
CONSERVATIVE
1.75
10.00
8.00
1.50
6.00
1.25
4.00
1.00
0.75
2.00
UNCONSERVATIVE
0.50
0.00
fr3 (Reinforced beams)
fr3 (Prestressed beams)
SM (EHE-08)
SM (MC2010)
SM (RILEM)
Fig. 8.48
In
fl
uence of
ρ
l
and f
R3
on shear safety margins
Beside fracture parameter f
R3
, parameter f
R1
should be considered for shear
strength, since it depends also on the smaller cracks. A parameter that better
represents the shear strength in FRC could be represented by the average value
f
Rm
=(f
R1
+ f
R3
)/2.
Codes are highly conservative for prestressed beams, better and more appro-
priate rules for considering the compressive stress in the beams should be
proposed.
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