Polymorf - Knowhere - Queenpost truss bridge

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

Fig. 164 - Structural details of a Queenpost railway bridge (scale visualization model)

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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Page 104 - Building stability - Queenpost truss bridge