Civil Engineering Reference
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2.50
1600.00
CONSERVATIVE
(d)
2.25
1400.00
(c)
2.00
1200.00
(a)
1.75
1000.00
1.50
800.00
1.25
600.00
1.00
400.00
(b)
0.75
200.00
UNCONSERVATIVE
0.50
0.00
d (Reinforced beams)
d (Prestressed beams)
SM (EHE-08)
SM (MC2010)
SM (RILEM)
Fig. 8.6
Beams without shear reinforcement (neither bers nor stirrups). SM versus d (mm)
8.3.4 In
uence of the Amount of Longitudinal
Reinforcement,
fl
ρ
l
In prestressed beams without any shear reinforcement, SM increase when increase
ρ
l
in the range
ρ
l
≤
2 %. When
ρ
l
≫
2 %, SM according to MC2010 in prestressed
beams increases quickly (Fig.
8.7
).
8.3.5 In
fl
uence of the Prestressing Stress, σ
c
Prestressed beams are always safe according to all Codes (Fig.
8.8
). It can be
observed that shear experimental stress and SM of all Codes increase linearly with
˃
c
(Fig.
8.9
).
2.50
4.00
CONSERVATIVE
2.25
3.50
2.00
3.00
1.75
2.50
1.50
2.00
1.25
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. 8.7
Beams without shear reinforcement. SM represented versus
ρ
(%)
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