Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 273

Design Bending Moment (M Ed ) and Shear Force (Q Ed )
M Ed ¼ 4677 :

3kNm

Q Ed ¼ 1600 : 8kN

Design of the Cross Girder Cross Section
The cross girder is designed as a welded plate girder as shown in Figure 4.49 .
The web height is taken as equal to 1500 mm, which conforms to the recom-
mended values L /(7 9) ¼ 12,000/(7 9) ¼ 1714 1333 mm. The web
plate thickness is assumed to be 14 mm. The flange width is taken as equal
to 360 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 165mm, t fl ¼ 24, C 1 = t fl ¼ 165 = 24 ¼ 6 : 9 9 0 : 924

¼ 8 : 316 Cross girder flange is class 1 ð Þ:

C 2 ¼ 1464mm, t w ¼ 14, C 1 = t fl ¼ 1464 = 14 ¼ 104 : 6 < 124 0 : 924

¼ 114 : 58 Cross girder web is class 3 ð Þ:

2.4

C 1 = 16.5

y y

146.4

1.4

2.4

36

Figure 4.49 Welded plate girder section of cross girders.