Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 438

r

I x
A

r

32,821
136

i x ¼ ¼ ¼ 15 : 53 cm

I y
A

r r

58,61 : 3

i y ¼ ¼ ¼ 6 : 56 cm

136

l b y ¼ 3600mm
l b x ¼ 4000mm

L cr
i

1
l 1

l¼

l 1 ¼ 93 :

9 0

:

924 ¼ 86

:

7636

3600
65

1

l¼

6 7636 ¼ 0

: 633

: 86 :

The axial compressive force in the vertical member V 2 ( N Ed ¼ 1878.6 kN):
N Ed
N b , Rd 1

: 0

wAf y
g M1

where N b , Rd ¼

1
F +

w¼ p but w 1 : 0

l 2 F 2

h i

+ l 2

51+ a l 0

F¼ 0 : : 2

¼ 0

633 2 F¼ 0 : 51+0 : 49 0 ð : 633 0 : 2 Þ +0 : : 806

1

806 +

p

w¼ ¼ 0 : 766 but w 1 : 0

806 2 633 2 0 : 0 : 0 :

:

766 13600 275
1 : 1

0

Then, N b , Rd ¼ ¼ 2604400N

N b , Rd ¼ 2604 : > N Ed ¼ 1878 : ð : : Þ

4kN 6 kN Then O K

It should be noted that members V 3 and V 5 having forces of zero under
the dead and live cases of loading can be taken with the same flange plate
width and the same web height but with a minimum thickness of 1 cm as
shown in Figure 4.199 .

4.6.3.18 Design of the Diagonal Member D 1
We can also design the diagonal member D 1 , shown in Figure 4.200 ,
carrying a maximum tensile design force of 6203.9 kN. The bolts used in