Civil Engineering Reference
In-Depth Information
Fig. 8.2
Type and position of existing reinforcement
8.1.3.3 Strengthening system
Externally bonded CF sheet,
3500N/mm
2
tensile strength
f
Luk
=
and modulus of
230 000 N/mm
2
, will be used for the strengthening. This results in the
following ultimate strain:
elasticity
E
L
=
ε
Lk
3500
=
230
15
:
22 mm
=
m
One layer of CF sheet has a nominal thickness
t
L,i
=
0.15mm. The strengthening system
includes an appropriate epoxy resin adhesive. According to DAfStb guideline part 1
section 2.1.1 (RV 4) [1, 2], the strengthening system must have a national technical
approval. This approval de
nes the material properties but also further system coef-
ficients, which for the system used here are listed in Table 8.2.
Table 8.2
System coef
cients.
[
k
0
]
[
k
1
]
[
k
2
]
[
k
3
]
[
k
4
]
1/(N/mm
2
)
0.2
2.0
0.25
0.7
1.0
[
k
5
]
[
k
6
]
[
k
7
]
[
k
8
]
[
k
9
]
10
2
1.0
0.75
0.39
0.89
0.44
Search WWH ::
Custom Search