Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 247

X.G. web

X.G. web

100 kN

Stringer web

s

Fsin a

s

100 kN

Plan

F

Fcos a

Stringer web

166.7 cm 166.7 cm 166.7 cm

y

x x

Bracing cross section s - s

2 angles back-to-back
80×80×8

10 mm

y

Figure 4.24 Lateral shock (nosing force) bracing for stringers.

Assume the cross section of the stringer bracing as two angles back-to-
back 80 80 8 (see Figure 4.24 ); then,

a¼ tan 1 1

: 8

2

667 ¼ 47

:

1 :

l b ¼ 2453mm

r

235
275

e ¼ ¼ 0 : 924

L cr
i

1
l 1

l¼

l 1 ¼ 93 : 9 0 : 924 ¼ 86 : 7636

2435
24

1

l¼

7636 ¼ 1

: 163

: 3 86 :