Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 320

dimensions, we can determine the maximum moment applied to the sole
plate ( M ) as follows:

2 10 3 M ¼R D+L+ F e = 2 ¼ 5822 : 97 : 8 = 2 ¼ 284,705,580Nmm :

¼ b 1 t 1 =

4 ¼ 175 t 1
The plate thickness t 1 can be calculated now as follows:
M
W pl ¼

4 ¼ 700 t 1 = Section plastic modulus W pl

f y
g M0
284,705,580
175 t 1 ¼

340
1 : 0
Then, t 1 ¼ 69.2 mm, taken as 80 mm, as shown in Figure 4.90 .

Design of the Rollers
The design of rollers requires determination of the diameter, length, and
number of rollers to resist the vertical load as well as the arrangement and
allowed movement in the direction of rollers. The design axial force per unit
length of roller contact N Sd specified in BS EN 1337-1 [3.11] shall satisfy

N

Sd N Rd

where N Rd is the design value of resistance per unit length of roller contact,

which is calculated as

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

Assume the number of rollers is 2 and their length is 800 mm as shown in
Figure 4.33 :

2 10 3
1600

R D+L+ F 5822 :

Sd ¼

2 800 ¼

¼ 3638 : =

N 9N mm

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

N Rd as follows:

131 R
Then, R¼ 109.8 mm, taken as 110 mm and the diameter D is 220 mm.

3638 : 9 ¼ 33 :

Design of Upper Bearing Plate
The upper bearing plate is shown in Figure 4.90 . The width and length of
the plate are dependent on the spacing between rollers and the length of