Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 324

8

8
9

28

22

9

6

Figure 4.92 The designed roller and hinged line rocker fabricated steel bearings.

06 10 3

M x
I x y ¼

921 370

950 1100 3

:

550 ¼ 1 : 79MPa

= 12

M y
I y x ¼

522 10 3 370

1100 950 3

12 475 ¼ 1

: 17MPa

=

f max ¼ 5 : 57 1 : 79 1 : 17 ¼ 8 : 53MPa

f min ¼ 5 : : :

17 ¼ 2

:

61MPa
The critical bending moment on the base plate of the hinged bearing is
at section s - s shown in Figure 4.91 :

57 + 1 79 + 1

M ¼ 0 ð : 5 400 6 : 04 Þ 1100 400 = 3+ 0 ð : 5 400 8 : 53 Þ 1100

400 2 = 3 ¼ 677,600,000Nmm

W pl ¼ 1100 t 4 = 4 ¼ 275 t 4

f y
g M0
677,600,000
275 t 4

M
W pl ¼

340
1 : 0

¼

Then, t 4 ¼ 85.1 mm, taken as 90 mm.
The normal stresses at section s 1 - s 1 , shown in Figure 4.91 , of the line
rocker bearing can be checked as follows:

06 10 3

M x ¼ 921 : 280 ¼ 257,896,800Nmm :

M y ¼ 522 10 3

280 ¼ 146,160,000Nmm :

2 10 3
150 800 ¼ 48

N
A ¼

5822 :

: 52MPa