Civil Engineering Reference
In-Depth Information
Loads on the system in kN/m
2
for the various load cases.
Table 8.1
Load case
1
2
3
G
k
(dead load
+
fitting-out)
2014.7
2014.7
2014.7
Q
k
(imposed load, category B)
1400
—
2500
Load case 3 governs for designing the strengthening measures. The load combination
for the ultimate limit state and the load combination for the serviceability limit state
under a quasi-permanent load combination are required for the analyses. These load
combinations are given by DIN EN 1990 [24] together with its associated National
Annex [25]. The load at the ultimate limit state (persistent and transient design
situations) for this example is
X
X
1
γ
G
;
j
?
G
k
;
j
γ
P
?
P
γ
Q
;
1
?
Q
k
;
1
1
γ
Q
;
i
?
ψ
0
;
i
?
Q
k
;
i
j
i
>
N
Ed
γ
G
?
G
k
γ
Q
?
Q
k
1
:
35
?
2014
:
7
1
:
5
?
2500
6469
:
8kN
and the loading for the serviceability limit state under a quasi-permanent load combi-
nation is
X
X
G
k
;
j
P
1
ψ
2
;
i
?
Q
k
;
i
j
1
i
>
N
Eqp
G
k
;
j
ψ
2
?
Q
k
2014
:
7
0
:
3
?
2500
2764
:
7kN
8.1.3
Construction materials
8.1.3.1 Concrete
Concrete of strength class C30/37 was able to be ascertained from the as-built documents
according to DIN 1045 [146]. Following a test on the member to [95], the result was
also class C30/37. Therefore, the values according to DIN EN 1992-1-1 [20] Table 3.1
will be used in the design, i.e. mean concrete compressive strength
f
cm
=
38N/mm
2
,
30N/mm
2
and modulus of elasticity
characteristic concrete compressive strength
f
ck
=
33 kN/mm
2
.
E
cm
=
8.1.3.2 Type and quantity of existing reinforcement
According to the as-built documents, the longitudinal reinforcement is 12 Ø25mm
(
A
s
=
58.9 cm
2
) and the links are Ø10mm @ 30 cm (closer at the ends
-
see
5.23 cm
2
/m). With as-built documents to DIN 1045-1 [146],
we can assume that the existing reinforcing steel has a yield stress
f
syk
=
Figure 8.2,
a
sw
/
s
w
=
500 N/mm
2
and a modulus of elasticity
E
s
=
200 kN/mm
2
. Figure 8.2 shows the layout of the
existing reinforcement.
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