Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 301

4.3.3.19 Design of the Compression Vertical Member V 3
The compression vertical member V 3 , shown in Figure 4.73 , carrying a
compressive design force of 3190.7 kN can be designed as follows. To
classify the cross section chosen (see Figure 4.73 ),

s

235
f y

r

235
275

e ¼ ¼ ¼ 0 : 924

C 1 ¼ 336mm, t fl ¼ 16, C 1 = t fl ¼ 336 =

16 ¼ 21

: < : ð Þ

0 30 5 Flange is Class 1

C 2 ¼ 159mm, t w ¼ 24, C 2 = t fl ¼ 159 = 24 ¼ 6 : 6 < 30 : 5 Web is class 1 ð Þ

32 cm 2

A¼ 2 35 2 : :

2 1

:

6 ¼ 224

:

4+35

2 3 4 3 8 2 I x ¼ 1 : 6 35 : = 12 + 2 35 2 : = 12 + 35 2 : 4 18 :

8cm 4 ¼ 65,273 :

6 3 4 35 3 12 ¼ 17,162 cm 4 I y ¼ 35 : 2 1 : = 12 + 2 2 : =

r

I x
A

r

65,273

: 8

i x ¼ ¼ ¼ 17 : 06 cm

224 : 32

r

I y
A

r

17162
224

i y ¼ ¼ ¼ 8 : 75 cm

: 32

l b y ¼ 6750mm
l b x ¼ 7500mm

L cr
i

1
l 1

l¼

d 1 = 35 cm

y

2.4

C 1 = 15.9

x x

C 2 = 33.6
2.4

1.6

y

Figure 4.73 The cross section of the vertical compression member V 3 .