Civil Engineering Reference
In-Depth Information
Upper wind bracing
Main truss
S
a
S
1
S
1
Main truss
End portal
frame
RC floor
h
S
2
S
2
a
3
Hinged bearing
Stringers
L = n×a
Elevation
B
S
Cross girders
Lower wind bracing
Lower wind bracing
Roller bearing
Cross-section S-S
Main truss
Plan of lower wind
bracing
(Section
S
2
-S
2
)
Bracing members
Cross girders
Main truss
Bracing members
End portal
frame
Plan of upper wind
bracing
(Section
S
1
-S
1
)
Figure 1.20 General layout of a through truss highway steel bridge.
longitudinal loads associated with moving traffic. Cross girders must be
aligned with vertical members to avoid adding bending moments to truss
members. Hence, the spacing between cross girders (
a
) is the spacing
between vertical truss members. The spacing between vertical truss mem-
bers is dependent on the angle of inclined truss members, which is defined
by the height of the vertical members (
h
) that is dependent on the length of
the bridge (
L
). The length of the bridge (
L
) is equal to the number of spacing
between cross girders or vertical truss members (
a
).
Let us now look at the structural components and general layout of a
steel-concrete composite highway bridge shown in
Figure 1.21
. The bridge
has a RC floor supported by a number of main I-shaped plate girders.
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