Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 369

Design of Stringer Cross Section

W pl f y
g M0

M c , Rd ¼ for classes 1 and 2

W pl 275
1

2 10 6 523 : ¼

: 0

5cm 3
ChooseUB 457 191 89 (equivalent toAmericanW18 60), shown in
Figure4.132 . W PL around x - x¼ 2014 cm 3 .Toclassify the cross sectionchosen,

W PL ¼ 1,902,545mm 3 ¼ 1902 :

s

235
f y

r

235
275

e ¼ ¼ ¼ 0 : 924

C 1 ¼ 80 : t fl ¼ 17 :

7, C 1

= t fl ¼ 80 : = :

7 ¼ 4

:

5 9 0

:

5mm, 5 17 924

¼ 8 : 316 Stringer flange is class 1 ð Þ

C 2 ¼ 407

: 6mm, t w ¼ 10 : 5, C 1 = t fl ¼ 407 : 6 = 10 : 5 ¼ 38 : 8 72 0 : 924

¼ 66 : 5 Stringer web is class 1 ð Þ

Check of Bending Resistance

W pl f y
g M0 ¼

2014 10 3

275

M c , Rd ¼ ¼ 553,850,000Nmm

1 : 0

¼ 553 : 85 kNm > M Ed ¼ 523 : 2 kNm Then O ð : K : Þ

191.9 mm

17.7

10.2

x x

C 2 =
407.6

463.4 mm 428

10.5

C 1 = 80.5

17.7

Figure 4.132 The cross-section of stringers (UB 45719189).