Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 313

b = 40

y

1.6

x x

1.6

1.6

y

1.6

55 cm

Figure 4.83 The cross section of the lower chord tension member L 3 .

4.3.3.29 Design of the Lower Chord Member L 2
The lower chord member L 2 , shown in Figure 4.84 , carrying a tensile design
force of 4191.2 kN can be designed as follows:

0 ¼ 185 cm 2

A¼A net ¼ 55 1 :

0+40 1

:

0+2 45 1

:

Af y
g M0 ¼

185 100 275
1

N pl , Rd ¼ ¼ 5,087,500N ¼ 5087 : 5kN > N Ed

: 0

¼ 4191 : 2kN

0 : 9 A net f u

g M2 ¼

0 : 9 185 100 430

1

N u , Rd ¼ ¼ 5,727,600N ¼ 5727 : 6kN

: 25

> N Ed ¼ 4191 : 2kN

b = 40

1 y

x

x

1

1

y

1

55 cm

Figure 4.84 The cross section of the lower chord tension members L 2 and L 1 .