Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 440

26 cm

y

1.6

x x

1.4

1.6

y

Figure 4.201 The cross section of the diagonal tension member D 3 .

The bolts used in connecting the member with gusset plates are M27
high-strength pretensioned bolts having a clearance of 3 mm (hole diameter
¼ 30 mm):

12 cm 2 A¼ 2 26 1 : 6+32 : 8 1 : 4 ¼ 129 :

92 cm 2 A net ¼ 129 : 12 4 3 : 0 1 : 6 ¼ 109 :

Af y
g M0 ¼

129 : 12 275 100

1

N pl , Rd ¼ ¼ 3,550,800N ¼ 3550 : 8kN > N Ed

:

0

¼ 3284 : 3kN

0 : 9 A net f u

g M2 ¼

0 : 9 10,992 430

1

N u , Rd ¼ ¼ 3,403,123N ¼ 3403 : 1kN

: 25

> N Ed ¼ 3284 : 3kN

4.6.3.20 Design of the Compression Diagonal Member D 2
The diagonal compression members V 2 , shown in Figure 4.202 , carrying a
compressive design force of 4706.6 kN can be designed as follows. To
classify the cross section chosen (see Figure 4.202 ) ,

s

235
f y

r

235
275

e ¼ ¼ ¼ 0 : 924

C 1 ¼ 180mm, t fl ¼ 30, C 1 = t fl ¼ 180 = 30 ¼ 6 : 0 < 30 : 5 Flange is Class 1 ð Þ

C 2 ¼ 300mm, t w ¼ 20, C 2 = t fl ¼ 300 = 20 ¼ 15 < 30 : 5 Web is Class 1 ð Þ

A¼ 2 26 3+30 2 2 ¼ 276 cm 2