Cable-stayed bridge

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Cable-stayed bridge

The Russky Bridge in Vladivostok has a central span of 1104 metres. It is the world's longest cable-stayed bridge.
Ancestor	Suspension bridge
Related	Extradosed bridge
Descendant	Side-spar cable-stayed bridge, Self-anchored suspension bridge, cantilever spar cable-stayed bridge
Carries	Pedestrians, bicycles, automobiles, trucks, light rail
Span range	Medium to Long
Material	Steel rope, post-tensioned concrete box girders, steel or concrete pylons
Movable	No[citation needed]
Design effort	medium
Falsework required	Normally none

A cable-stayed bridge has one or more towers (or pylons), from which cables support the bridge deck. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines. This is in contrast to the modern suspension bridge, where the cables supporting the deck are suspended vertically from the main cable, anchored at both ends of the bridge and running between the towers. The cable-stayed bridge is optimal for spans longer than cantilever bridges and shorter than suspension bridges. This is the range within which cantilever bridges would rapidly grow heavier, and suspension bridge cabling would be more costly.

Cable-stayed bridges were being designed and constructed by the late 16th century,^[1] and the form found wide use in the late 19th century. Early examples, including the Brooklyn Bridge, often combined features from both the cable-stayed and suspension designs. Cable-stayed designs fell from favor in the early 20th century as larger gaps were bridged using pure suspension designs, and shorter ones using various systems built of reinforced concrete. It returned to prominence in the later 20th century when the combination of new materials, larger construction machinery, and the need to replace older bridges all lowered the relative price of these designs.^[2]