Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 310

Af y 257 : 92 275 100

1

N pl , Rd ¼

g M0 ¼

¼ 7,092,800N ¼ 7092 : > N Ed

8kN

: 0

¼ 5372 : 3kN

0 : 9 A net f u 0 : 9 190 : 72 100 430

1

N u , Rd ¼

g M2 ¼

¼ 5,904,691N

: 25

¼ 5904 : 7kN > N Ed ¼ 5372 : 3kN

4.3.3.25 Design of the Diagonal Tension Member D 1
The diagonal member D 1 , shown in Figure 4.80 , carrying a maximum
tensile design force of 6711.5 kN can be designed as follows:
The bolts used in connecting the member with gusset plates are M27
high-strength pretensioned bolts having a clearance of 3 mm (hole diameter
Ø ¼ 30 mm):

64 cm 2

A¼ 2 35 3 : :

6 2

:

4 ¼ 304

:

2+33

84 cm 2

A net ¼ 304 :

64 8 3

:

0 2 ¼ 227

:

Af y
g M0 ¼

304 : 64 275 100

1

N pl , Rd ¼ ¼ 8,377,600N ¼ 8377 : 6kN > N Ed

: 0

¼ 6711 : 5kN

0 : 9 A net f u

g M2 ¼

0 : 9 227 : 84 100 430

1

N u , Rd ¼ ¼ 7,053,926N ¼ 7053 : 9kN

: 25

> N Ed ¼ 7053 : 9kN

4.3.3.26 Design of the Lower Chord Member L 5
Let us now design the tensile lower chord member L 5 , shown in Figure 4.81 ,
carrying a tensile design force of 11,165.7 kN. To assume a reasonable cross

35 cm

y

3.2

x x

2.4

3.2

y

Figure 4.80 The cross section of the diagonal tension member D 1 .