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 |
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◄ Fig. 163 - Lateral loading |
of a truss bridge |
(demonstration models) |
laterally braced |
truss bridge ► |
(top and bottom views) |
top view |
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. |
Lateral
bracing is also used between the top and bottom chords to resist sideways
loading. |
. |
The
following shows different views of the Queenpost railway bridge shown in
Fig. 161 |
previously with the major details identified. |
. |
 |
 |
a) side view |
click image to enlarge |
b) bottom view |
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Fig. 164 - Structural details of a Queenpost
railway bridge (scale
visualization model) |
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The top chord of the Queenpost truss also |
|
provided a plate upon which a roof could be |
supported, creating the classic covered bridge. |
On
the right is a version in which the normally |
external diagonal struts are internalized. |
Fig. 165 - Covered bridge
► |
(scale visualization model) |
click
image to enlarge |
|
. |
Like the
Kingpost truss bridge, practical limitations on how high the Queenpost
truss could |
be built
limited the distance it could span as a single, non-repeated unit. Improved
designs, |
like the Howe, Pratt, and Warren truss bridges, employed an expandable
design that could |
be repeated to span greater distances while keeping their height
constant. |
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Back
to Knowhere |
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Page 104
- Building stability - Queenpost truss bridge |
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