Three basic types of bridges:
The Beam Bridge- The Beam Bridge consists of a
horizontal beam supported at each end by piers.
The Truss Bridge- The Truss Bridge consists of an
assembly of triangles.
The Arch Bridge- The Arch Bridge consists of
arches made from steel or concrete.
Beam Bridges were one of the very first types of
bridges. They were made from a wooden log laid
across a river. Another type of bridge in the early
times was the Wood Frame Bridge. They were
made from wood grown locally.
A Clapper Bridge is a bridge made of large stones
and cement.
Romans were the first group of people the
construct Arch Bridges. Arches were used
because they formed a strong structure to support
roadways.
The early long-span bridges in Asia were called
the Calpanary Bridge.
Engineers began using concrete in bridge building
in 1822.
Arch Bridges, Suspension Bridges and the
Baltimore Bridge were built using the truss
design.
The first cast-iron bridge was built in 1779, at
Ironbridge in England and spans river Severn.
The Suspension Bridge was changed by the use of
metal because they could be made longer and
stronger.
The Baltimore Bridge appears to be the strongest
because it seemed to be built very strong.
The main parts of a Suspension Bridge are the
pylons, deck, stringers and cable.
Defined
Cable-stayed Bridge:
A Cable-stayed Bridge is a bridge that consists of
one or more columns, with cables supporting the
bridge deck.
Girder Bridge:
A Girder Bridge is a bridge built of girders placed
on bridge abutments and fountain piers.
Viaduct:
A Viaduct is a bridge composed of several small
parts.
Suspension bridge:
A Suspension bridge is a bridge in which the deck is
hung below suspension cables on vertical
suspenders.
Draw Bridge:
A Draw Bridge is a type of bridge that is movable,
and has been used with the entrance of a castle.
By Lucy Z