Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 432

50 cm

1.4

C = 36.2

e = 2.57

x x

m m

1.4

1.4

1.4

2 .4

Gusset plate

b = 36

Figure 4.193 The cross section of the compression members U 1 and U 2 .

4 40 3 4 3 7 2 I m ¼ 2 1 : = 12 + 50 1 : = 12 + 50 1 : 4 20 :

¼ 59342 cm 4

+36 1 : 4 3 9 2

=

12 + 36 1

:

4 16

:

57 2

¼ 57807 cm 4

I x ¼ 59342 232 :

4 2

:

4 50 3 4 36 3 4 3 7 2

I y ¼ 1 : = 12 + 1 : = 12 + 2 40 1 : = 12 + 40 1 : 4 18 :

¼ 59210 cm 4

r

r

I x
A

57807
232

i x ¼ ¼ ¼ 15 : 77 cm

: 4

r

I y
A

r

59210
232

i y ¼ ¼ ¼ 15 : 96 cm

: 4

l b x ¼ l b y ¼ 5000mm

L cr
i

1
l 1

l¼

l 1 ¼ 93 : 9 0 : 924 ¼ 86 : 7636

5000
157

1

l¼

7 7636 ¼ 0

: 365

: 86 :

The axial compressive force in the upper chord member U 2
( N Ed ¼ 4846.8 kN):

N Ed
N b , Rd 1

: 0