Civil Engineering Reference
In-Depth Information
25 cm
2.0
x
x
1.6
25 cm
22
22
2.0
Figure 4.23 Intermediate stability web stiffeners.
1
w¼
564 +
p
¼
0
:
954 but
w
1
:
0
564
2
29
2
0
:
0
:
0
:
0
:
954
194
:
26
100
275
1
Then,
N
b
,
Rd
¼
¼
4,633,101N
:
1
N
b
,
Rd
¼
4633
:
1kN
>
N
Ed
¼
3327
:
2 kN Then O
ð
:
K
:
Þ
4.2.7.2 Intermediate Stiffeners
Intermediate stiffeners (see
Figure 4.23
) can be designed by choosing its
dimensions such that
a
1
h
w
¼
p
¼
1
1667
3000
¼
0
:
556
<
:
414 Then O
ð
:
K
:
Þ
5
h
2
w
t
w
a
1
5
300
3
6
3
1
:
1
:
1
:
6cm
4
and
I
st
¼
¼
5969
:
7
2
166
:
¼
22913 cm
4
6
3
12 + 2
2
25
3
3
2
I
st
¼
46
1
:
=
=
12 + 50
13
:
6cm
4
Then O
>
5969
:
ð
:
K
:
Þ
4.2.8 Design of Stringer Bracing (Lateral Shock or Nosing Force
Bracings)
The stringer bracings are subjected to lateral moving reversible force of
100 kN. The bracing members carry either tensile or compressive forces
according to the changing direction of the lateral shock force (transverse
horizontal force) (see
Figure 4.24
). The cross section of the bracing member
can be determined from designing the critical diagonal member for the com-
pressive force as follows:
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