Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 258

Design of Upper Bearing Plate
The upper bearing plate is shown in Figure 4.33 . The width and length of
the plate are dependent on the spacing between rollers and the length of rol-
lers as well as the allowed movement in the direction of rollers. The thick-
ness of the upper bearing plate can be determined as follows:

2 10 3
2

R D+L+ F
2

ð D + 100 Þ 3327 : 240

2 ¼ 199,632,000Nmm :

M ¼ ¼

2

b 2 t 2

800 t 2

4 ¼ 200 t 2 mm 3
The plate thickness t 2 can be calculated now as follows:

W pl ¼

4 ¼

f y
g M0
199,632,000
200 t 1 ¼

M
W pl ¼

340
1

:

0

Then, t 1 ¼ 54.2 mm, taken as 60 mm, as shown in Figure 4.33 .
The radius of the curved part of the upper bearing plate, which has a
length of 600 mm as shown in Figure 4.33 , can be determined the same
way as that adopted for the design of the rollers:

f u 550 2

210,000

1
g 2 m ¼ 23 R

1
1 ¼ 33

N

Rd ¼ 23 R

E d

: 131 R

R D+L+ F
600 ¼

3,327,200
600 ¼ 5545

N

Sd ¼

: 33N = mm

Then, the radius of rollers can be determined by equalizing N Sd with

N Rd

as follows:

131 R
Then, R¼ 167.4 mm, taken as 170 mm.

5545 : 33 ¼ 33 :

Design of Lower Bearing Plate
The lower bearing plate is shown in Figure 4.33 . The width and length of
the plate are dependent on the strength of concrete and are dependent on
the spacing between rollers and the length of rollers as well as the allowed
movement in the direction of rollers. The thickness of the upper bearing
plate can be determined as follows: