Design Examples of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 325

M x
I x y ¼

257,896,800
150 800 3

12 400 ¼ 16

: 12MPa

=

M y
I y x ¼

146,160,000
800 150 3

12 75 ¼ 48

: 72MPa

=

f max ¼ 48 ð : 52 + 16 : 12 + 48 : 72 Þ ¼ 113 : 4MPa

< 340MPa Then O ð : K : Þ

4.3.3.35 Design of Joint J 1
It is now possible to design the joints of the main trusses after designing all
members and knowing all details regarding the joints. Let us start by design-
ing joint J 1 (see Figure 4.93 ) . For M27 high-strength pretensioned bolts
used, the following design values are calculated:
F v,Rd ¼ 176 kN (single shear) and 353 kN (double shear)
F s,Rd ¼ 117 kN (single shear) and 234 kN (double shear)
F s,ult ¼ 103 kN (single shear) and 206 kN (double shear)

Number of Bolts for the Vertical Member V 1

F Ed
F s , ult ¼

5240 8

103 ¼ 50

:

N V ðÞ¼ : 9 bolts, taken as 54 bolts (27 bolts in each side

acting in single shear)

Number of Bolts for the Diagonal Member D 1
N D ðÞ¼

5
206 ¼ 32 : 6 bolts, taken as 40 bolts (20 bolts in each side
acting in double shear)

F Ed 6711 :

F s , ult ¼

4.3.3.36 Design of Joint J 2
Following the same procedures adopted for the design of joint J 1 , we can
design joint J 2 (see Figure 4.94 ) using the same M27 high-strength preten-
sioned bolts as follows.

Number of Bolts for the Vertical Member V 2
N V ðÞ¼

F Ed 4195 1

103 ¼ 40

:

F s , ult ¼

: 7 bolts, taken as 48 bolts (24 bolts in each side

acting in single shear)