Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 354

25 cm

2.0

x x

1.6

25 cm

22 22

2.0

Figure 4.120 Load bearing web stiffeners at supports.

2cm 2

A¼ 2 25 2 : 0+46 : 0 1 : 6 ¼ 155 :

¼ 22,913 cm 4

6 3 12 + 2 2 25 3 3 2

I x ¼ 46 1 : = = 12 + 50 13 :

1
F +

w¼ p but w 1 : 0

l 2 F 2

h i

+ l 2

51+ a l 0 F¼ 0 : : 2

s

Af y
N cr

l¼

p 2 14 2 210,000 22,913 10 4

3480 2

EI
L 2

3 :

N cr ¼ ¼ ¼ 39,174,373N

r

155

2 100 275
39,174,373

:

l¼

¼ 0 : 33

¼ 0

33 2 F¼ 0 : 51+0 : 49 0 ð : 33 0 : 2 Þ +0 : : 586

1
0 : 586 +

w¼ p ¼ 0 : 934 but w 1 : 0

0 : 586 2 0 :

33 2

0 : 934 155 2 100 275

1

:

Then, N b , Rd ¼ ¼ 3,623,920N

: 1

N b , Rd ¼ 3623 : 9kN > N Ed ¼ 2193 : 36 kN Then O ð : K : Þ

4.4.4.2 Intermediate Stiffeners
Intermediate stiffeners (see Figure 4.121 ) can be designed by choosing their
dimensions such that