Civil Engineering Reference
In-Depth Information
Therefore, the threshold value of the
l
b
,max
is too short (nonconservative), and the
FIB model in this case does not accurately account for the variation in the FRP
plate length within the shear span. Nevertheless, the plate length in the shear span
of Beam B10 is very short,
L
L
af
a
=
, which is not typically used in practice.
0.5
Example 5.14: Design
Arduini, Tommaso, and Nanni (1997) tested a series of beams, one of which (A4)
failed by cover delamination when strengthened with three parallel CFRP plates
(one layer), as seen in Figure 5.22. The beam had the following parameters:
P
P
=
110 kN
f
=
540 MPa
n
y
=
70 kN
E
=
200 GPa
n
s
f
=
3MPa
E
=
167 GPa
c
f
E 5GPa
=
t
=
.3 mm
c
f
*
f
=
2906 MPa
fu
Solution:
L
L
550
700
af
a
= =
0.786
P
n
2
M
=× =
0.7m
38.5kN-m
n
f
ctm
==
f
0.62 33
=
3.56 MPa
200 mm
37 mm
2 φ 14
200 mm
126 mm
2 φ 14
37 mm
t
f
= 1.3 mm
P/2
P/2
700 mm
600 mm
700 mm
550 mm
550 mm
2000 mm
Beam A4
FIGURE 5.22
Example 5.14 showing the beam section and profile.
Search WWH ::
Custom Search