Civil Engineering Reference
In-Depth Information
2#3
#3 @ 6" c/c
18"
6"
4#6
1.0"
10"
FIGURE 5.4
Example 5.3 showing the cross-section details.
Example 5.3: Analysis
For the b
ea
m shown in Figure 5.4, determine the increase in moment-carrying
capacity
M
M
. Neglect the compression reinforcement. The CFRP covers the tension
face of the beam and is wrapped 6
"
up the two sides of the beam section, as shown
(Rasheed et al. 2010). The CFRP sheets have the following properties:
n
n
M-Brace CF130
Two plies
f
=
440 ksibased on fiber netarea
0.014
fu
ε=
=
fu
E
33,000 ksi
f
t
=
0.0065 in
sheet
B
10 in.
254 mm
H
18 in.
457.2 mm
5 ksi
34.5 MPa
f
c
f
y
83.5 ksi
576 MPa
Main bars
#6
ϕ = 19 mm
Cover
1 in.
25.4 mm
Solution:
Since these examples are intended to target ductile crushing failure, there is no
need to use the environmental factors (
C
e
) of ACI 440.2R-08.
3
8
1
2
6
8
dd
==− −−×=
18
1"
16.25"
t
2
A
=× =
=
××× +×××
×+×
40.441.76in
2 10
s
t
18
26
t
15)
d
=
16.36"
f
2 10
t
26)
t
2
A
=× +××
(100.0065"260.0065)2plies0.286 in
×
=
f
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