Civil Engineering Reference
In-Depth Information
5000
S
U
1
U
2
U
3
U
4
U
5
4000
D
1
D
3
V
1
V
2
V
3
V
4
D
4
V
5
D
2
L
1
L
2
L
3
L
4
L
5
8 × 5000 = 40,000 mm
S
Elevation
150
200
4000 mm
2000
2000
1000
1000
2000
2000
2000
1000
1000
2000
10,000 mm
Figure 4.162 General layout of a deck truss highway steel bridge (the fifth design
example).
rules specified in EC3 [1.27]. The steel material of construction of the bridge
conformed to standard steel grade EN 10025-2 (S 275) having a yield stress
of 275 MPa and an ultimate strength of 430 MPa. The dimensions and gen-
eral layout of the bridge are shown in
Figures 4.162
and
4.63
.
The bridge has
upper and lower wind bracings of K-shaped truss members as well as cross
bracing of K-shaped truss. The expected live loads on the highway bridge
conform to Load Model 1, which represents the static and dynamic effects
of vertical loading due to normal road traffic as specified in EC1 [3.1]. The
bolts used in connections and field splices are M27 high-strength preten-
sioned bolts. The unit weight of reinforced concrete slab decks used is
25 kN/m
3
.
4.6.1 Design of the Stringers
Let us start by designing the stringers, the longitudinal steel beams, support-
ing the reinforced concrete slab deck as shown in
Figure 4.162
.
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