Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 390

X.G. web

X.G. web

100 kN

Stringer web

s

Fsin a

s 100 kN 180 cm

Plan

F

Fcos a

Stringer web

150 cm

150 cm 150 cm

Figure 4.150 Analysis of forces acting on the lateral shock bracing.

y

x x

Bracing cross section s - s

2 angles back-to-back
80 × 80 × 8

10 mm

y

Figure 4.151 The cross section of the lateral shock bracing members.

member can be determined from designing the critical diagonal member for
the compressive force as follows:
Assume the cross section of the stringer bracing as 2 angles back-to-back
80 80 8 (see Figure 4.151 ) ; then,
a¼ tan 1 1

: 8

2

5 ¼ 50

:

1 :

l b ¼ 2343mm

r

235
275

e ¼ ¼ 0 : 924

L cr
i

1
l 1

l¼