Civil Engineering Reference
In-Depth Information
4.2.2 Design of the Cross Girders (Lateral Floor Girders)
The cross girders, the lateral floor beams, carry concentrated loads from the
stringers as shown in
Figure 4.1
.
Therefore, we can analyze an intermediate
cross girder as follows:
Dead Loads
Reaction from stringers due to dead loads
¼
4
:
8
5
¼
24 kN
0kNm
1
Assuming the cross girders are simply supported by the main plate
girders, we can calculate the maximum shear force and bending moment
due to dead loads on an intermediate cross girder (see
Figure 4.8
)
as follows:
Q
D
:
L
:
¼
3
7
Own weight of cross girder
¼
3
:
:
2
=
2+2
24
¼
58
:
8kN
M
D
:
L
:
¼
3
7
:
2
2
=
8+24
0
:
95 + 24
2
:
75
¼
108
:
24 kNm
4.8×5=24 kN
24 kN
24 kN
24 kN
g
vk
= 3.0 kN/m
A
B
0.95
1.8
0.85
0.85
1.8
0.95
Y
A
= 58.8 kN
Y
B
= 58.8 kN
7.2 m
58.8 kN
55.95
31.95
26.55
+
2.55
S.F.D.
2.55
-
26.55
31.95
55.95
58.8 kN
B.M.D.
+
54.51 kN.m
54.51
107.16
107.16
108.24
Figure 4.8 Straining actions from dead loads acting on an intermediate cross girder.
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