Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 404

f max ¼ 3 : 0 0 : 49 2 : 08 ¼ 5 : 57MPa

f min ¼ 3 : : :

08 ¼ 0

:

43MPa
The critical bending moment on the base plate of the hinged bearing is at
section s - s shown in Figure 4.160 :

0+0 49 + 2

M ¼ 0 ð : 5 400 3 : 41 Þ 1100 400 = 3+ 0 ð : 5 400 5 : 57 Þ 1100

400 2 = 3 ¼ 426,800,000Nmm

W pl ¼ 1100 t 4 = 4 ¼ 275 t 4

f y
g M0
426,800,000
275 t 4

M
W pl ¼

340
1

¼

: 0

Then, t 4 ¼ 67.6 mm, taken as 70 mm.
The normal stresses at section s 1 - s 1 , shown in Figure 4.160 , of the line
rocker bearing can be checked as follows:

6 10 3 M x ¼ 381 : 170 ¼ 64,872,000Nmm :

M y ¼ 1431 10 3 170 ¼ 243,270,000Nmm :

N
A ¼

3,132,800
150 800 ¼ 26 : 11MPa

M x
I x y ¼

64,872,000
150 800 3

12 400 ¼ 4

: 05MPa

=

M y
I y x¼

243,270,000
800 150 3

12 75 ¼ 81

:

09MPa

=

f max ¼ 26 : 11 + 4 : 05 + 81 : 09 ð Þ ¼ 111 : 25MPa

< 340MPa Then O ð : K : Þ

4.6 DESIGN EXAMPLE OF A DECK TRUSS HIGHWAY STEEL
BRIDGE
The fifth design example presented in this chapter is for a deck truss highway
steel bridge. The general layout of the through bridge is shown in
Figures 4.162 and 4.163 . The truss bridge has simply supported ends with
a length between supports of 40 m. The truss bridge has a Warren truss with
8 equal panels of 5 m. It is required to design the bridge adopting the design