Clark Bridge in Alton Ill.
|Typical Span Lengths||110m - 480m|
|World's Longest||Tatara Bridge, Japan|
A typical cable-stayed bridge is a continuous girder
with one or two towers erected above piers in the middle of the span.
From these piers, cables are attached diagonally to the girder to
provide additional support. Cable-stayed bridges have a low center of
gravity which makes them strong against earthquakes, but at the same
time makes them vulnerable to uneven sinking of the ground.
Cable-stayed bridges have been around for the last couple of centuries but have become more prevalent in the last 50 years. Cable-stayed bridges are very price competitive in the 500-2000 ft span lengths range. They offer greater stiffness, torsional and lateral rigidity over that of suspension bridges. This helps make cable-stayed bridges stable against the wind and offers aerodynamic effects.
Cable-stayed bridges are different from suspension bridges that the cables are more taut the flexible cables of suspension bridges. This creates stable points supports in the main span which minimizes deflections.
Cable-stayed bridges offer outstanding architectural appearances due to it's small diameter cables, minimum overhead structure, and wide choice of design methods. This includes using single or multiple cables, in a fan, harp, bundle or star design. The pylon design can also vary significantly.
Cable-stayed bridges have been around since at least 1840 (Hartley System) but it was not until the 1950's did the start becoming prevalent. Even before 1840 their was evidence of primitive bridges had decks stayed from above by ropes or vines. The first cable-stayed bridges of modern time (Strösund Bridge in Sweden and North Bridge in Düsseldorf) were designed with steel decks. This is no longer the standard but is used in cases where weight is a concern. The Strösund Bridge in Sweden was designed by a German, Franz Dischinger, while the North Bridge (or Theodor Heuss) Bridge was designed by another German, Theodor Heuss. He designed a family of three cable-stayed bridges over the Rhine at Düsseldorf.
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