Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 370

Check of Shear Resistance

A v f y = p = p ð 428 10 : 5 Þ 275

V pl , Rd ¼ ¼ ¼ 713,518 : 3N

g M0 1 : 0

¼ 713 : 5kN > Q Ed ¼ 567 kN Then O ð : K : Þ

4.5.2 Design of the Cross Girders
The cross girders carry concentrated loads from the stringers as shown in
Figure 4.133 . Therefore, we can analyze an intermediate cross girder as
follows:

Dead Loads

Reaction from stringers due to dead loads ¼ 4 : 8 4 : 5 ¼ 21 : 6kN

m
Assuming the cross girders are simply supported by the main plate
girders, we can calculate the maximum shear force and bending moment

Own weight of cross girder ¼ 3 : 0kN =

4.8 × 4.5 = 21.6 kN 21.6 kN

21.6 kN 21.6 kN

g vk = 3.0 kN/m

A B

1.8 1.8 0.9 0.9 1.8 1.8

Y A = 56.7 kN Y B = 56.7 kN

9.0 m

56.7 kN

51.3

29.7

24.3

+

2.7

S.F.D.

2.7

-

24.3

29.7
51.3

58.8 kN

B.M.D.

+

97.2 kN m

97.2

145.8

145.8

147

Figure 4.133 Straining actions from dead loads acting on an intermediate cross girder.