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Form & Function: Expression
of Truth/Beauty
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Concepts & Research
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Suspension Bridge
A suspension bridge is one where cables
(or ropes or chains) are strung across the river (or whatever the
obstacle happens to be) and the deck is suspended from these cables.
Modern suspension bridges have two tall towers through which the cables
are strung. Thus, the towers are supporting the majority of the roadway's
weight. Almost
all suspension bridges have, in addition to the cables, a supporting
truss system beneath the bridge deck (a deck truss). This helps to
stiffen the deck and reduce the tendency of the roadway to sway and
ripple.
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Cable Stayed Bridge
A cable-stayed bridge is a bridge that consists of one or more
columns, normally referred to as towers
or pylons, with cables
supporting the bridge deck.
There are two major classes
of cable-stayed bridges. The harp
design, the cables are made nearly parallel by attaching cables to
various points on the towers so that the height of attachment of each
cable on the tower is similar to the distance from the tower along the
roadway to its lower attachment. In a fan design, the cables all connect to or pass over the top
of the towers.
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Arch Bridge
An arch bridge is a semicircular
structure with abutments on each end. The design of the arch, the semicircle,
naturally diverts the weight from the bridge deck to the abutments. Arch
bridges are always under compression and the force of compression is
pushed outward along the curve of the arch toward the abutments.
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