Civil Engineering Reference
In-Depth Information
recommended values
L
/(7
9)
¼
12,000/(7
9)
¼
1429
1111 mm. The
web plate thickness is assumed to be 16 mm. The flange width is taken as
equal to 240 mm, with a thickness of 24 mm. To classify the cross section
chosen,
s
235
f
y
r
235
275
e ¼
¼
¼
0
:
924
C
1
¼
104mm,
t
fl
¼
24,
C
1
=
t
fl
¼
104
=
24
¼
4
:
3
9
0
:
924
¼
8
:
316 Cross girder flange is class 1
ð
Þ:
C
2
¼
1184mm,
t
w
¼
16,
C
1
=
t
fl
¼
1184
=
16
¼
74
<
83
0
:
924
¼
76
:
7 Cross girder web is class 1
ð
Þ:
To calculate the bending moment resistance, the plastic section modulus
should be used:
8
3
2
120
3
2cm
3
W
pl
¼
24
124
:
=
4
2
11
:
=
4
¼
12,810
:
Check of Bending Resistance
W
el
,min
f
y
g
M0
2
10
3
12,810
:
275
M
c
,
Rd
¼
¼
¼
3,522,800,000Nmm
1
:
0
¼
3522
:
8kNm
>
M
Ed
¼
3100
:
7 kNm Then O
ð
:
K
:
Þ
Check of Shear Resistance
A
v
f
y
=
p
=
p
ð
1200
16
Þ
275
V
pl
,
Rd
¼
¼
¼
3,048,409N
g
M0
:
1
0
¼
3048
:
4kN
>
Q
Ed
¼
1164
:
1 kN Then O
ð
:
K
:
Þ
4.6.3 Calculation of Forces in Truss Members
4.6.3.1 General
To calculate the design forces in the truss members, we need to calculate the
dead and live loads acting on the main truss in the longitudinal direction,
which is addressed as follows.
Dead Loads
Weight of steel structure for part of bridge between main trusses:
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