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The beam is one of the simplest forms of bridge. In
its basic form, it could be just a plank or a log crossing a
stream.
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Simple stone and plank footbridge.
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Beam Bridge with wooden
frame and deck.
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The
beam has to be able to resist the bending which will happen
with the biggest load that the designer wants it to take.
There are simple examples of stone beam bridges which have
survived for a long time. Large modern examples use carefully
designed beams to support the bridge deck
(the part that we cross over.)
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Beam
bridges usually cover relatively short distances.
As they are lengthened, they need more supporting piers
(pillars). This makes them unsuitable if there needs to be a
lot of space underneath them. |
Beam bridge at Canary Wharf, Docklands.
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Underside of Canary Wharf
beam bridge. |
View
of the beam bridge supporting pillars. |
| Beam
bridge over the road at East India station, Docklands. |
East India Beam footbridge. |
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