Civil Engineering Reference
In-Depth Information
Table 8.7
Summary of
statistics of beams reinforced
only with stirrups
Reinforced beams (beams with stirrups)
EHE-08
MC2010
RILEM
Minimum
0.69
0.73
0.72
Maximum
1.71
1.52
1.70
Average
1.05
1.06
1.12
Standard deviation
0.25
0.20
0.25
CoV (%)
24.16
18.40
22.41
5th percentile (%)
0.71
0.76
0.79
95th percentile (%)
1.41
1.38
1.47
8.5 Case 3: Beams with Fibers (No Stirrups)
Tables
8.8
and
8.9
summarize the ranges of the different parameters used in this
case (beams only reinforced with
bers), differencing between reinforced and
prestressed beams, respectively.
8.5.1 In
fl
uence of the a/d Ratio and the Effective Depth, d
No trends are observed in the range studied for beams reinforced only with
bers.
8.5.2 In
fl
uence of the Concrete Compressive Strength, f
c
Reinforced beams presented low SM for high compressive strength levels
(f
c
> 70 MPa), of course, there are other beams with low SM, but the general trend
is that with high strength, Codes tend to be less safe.
Table 8.8
Range of parameters in the shear database of beams reinforced only with
bers
(N = 102)
Parameter
Minimum
Maximum
Average
CoV (%)
d (mm)
102
1,440
360.80
59.59
a/d
2.50
4.69
3.24
18.60
f
cm
(MPa)
17.00
96.34
38.86
41.32
f
R3
(MPa)
1.22
10.60
3.65
49.24
Amount of
bers (kg/m
3
)
15
240
63.31
66.33
ρ
(%)
0.99
3.72
2.23
39.80
˃
c
(MPa)
-
-
-
-
A
s
ʱ
/s (cm
2
/m)
-
-
-
-
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