Civil Engineering Reference
In-Depth Information
a
2
Cross girders
Main plate girder
Upper wind bracing
S
Rails
Sleepers
a
1
a
a
3
Stringers
Stringer
bracing
h
S
1
Stiffeners
S
1
Cross
bracing
S
2
S
2
S
L = n×a
Cross
bracing
B
Stiffeners
Main plate girder
Lower wind bracing
Elevation
Cross-section S-S
Stringer bracing
Main plate girder
Stringers
Cross girders
Upper wind bracing
member
Cross bracing
L = n×a
Plan of upper wind bracing
(Section
S
1
-S
1
)
Main plate girder
Cross bracing
Upper wind bracing
member
q
Bracing angle (30-60
°
)
Plan of upper wind bracing
(Section
S
2
-S
2
)
Figure 1.19 General layout of a double-track open-timber floor plate girder railway
steel bridge.
are supported by two, in this case of bridges (
Figure 1.19
)
, longitudinal
main steel beams known as
main plate girders
, which are the main structural
system for this type of bridges. The main plate girders are supported on
supports called “bearings” such as the
hinged and roller bearings
shown in
Figure 1.19
, which rest on foundations or piers, in case bridges are con-
structed over obstacles such as rivers, roads, and seas. The main girders
are spaced at a distance (
B
), which is the width of the bridge. The moving
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