suspension bridge


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suspension bridge:

see bridgebridge,
structure built over water or any obstacle or depression to allow the passage of pedestrians or vehicles. See also viaduct. Early Bridges

In ancient times and among primitive peoples a log was thrown across a stream, or two vines or woven fibrous ropes (the
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.

suspension bridge

A bridge hung from cables that are strung between two towers or a tower and abutment.
See also: Bridge

Suspension Bridge

 

a bridge in which the main support consists of flexible members (cables, ropes, or chains) under tension, and the bridge floor is suspended. Wire cables and ropes made of high-tensile steel with an ultimate strength of 2-2.5 giganewtons per sq m (200-250 kilograms-force per sq mm), which substantially reduce the deadweight of a bridge and permit longer bridge spans, are widely used in modern suspension bridges. In addition, suspension bridges have low rigidity because of the fact that during the movement of a temporary load on the bridge, the cable (chain) changes its geometric form, causing large deflections of the span. To reduce the deflections, suspension bridges are strengthened at the level of the bridge floor with longitudinal girders or stiffening trusses, which distribute the temporary load and decrease cable strain. Suspension bridges in which the bridge floor is supported by a geometrically stable suspended truss made of rectilinear cables (guys, or guy ropes) are called cable-braced bridges. Suspension systems are used primarily for highway and city bridges. The longest suspension bridge is the Verrazano-Narrows Bridge, which was built in 1965 at the entrance to New York Harbor (USA) and has a central span 1,298 m long.

REFERENCES

Tsaplin, S. A. Visiachie mosty. Moscow, 1949.
Spravochnik inzhenera-dorozhnika [vol. 6]. Moscow, 1964.
Smirnov, V. A. Visiachie mosty bol’shikh proletov. Moscow, 1970.

N. N. BOGDANOV

suspension bridge

[sə′spen·shən ‚brij]
(civil engineering)
A fixed bridge consisting of either a roadway or a truss suspended from two cables which pass over two towers and are anchored by backstays to a firm foundation.

suspension bridge

a bridge that has a deck suspended by cables or rods from other cables or chains that hang between two towers and are anchored at both ends
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The models for the suspension bridge with the cables of different stiffness are considered by comparing vertical displacements, bending moments and maximum displacements at the 1st and 2nd stages of erection.
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Finley invented the suspension bridge proper, with wrought iron chains, and in 1809 he designed a bridge to span the Merrimac river--from Newburyport to Amesbury in Massachusetts.
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KOCAELy (CyHAN)- Construction of yzmit Gulf Suspension Bridge, which is the most significant transition point of Gebze-Orhangazi-yzmir highway project that will reduce the travel time between ystanbul and yzmir from six-and-half hours to three-and-half hours, came to end.
The cable-stayed bridge--the first such bridge in Ontario--uses towers to hold up the bridge deck with a series of cables, similar to a suspension bridge.
A graduate of Rensselaer Polytechnic Institute and principal of Weidlinger Associates since 1977, he was highly regarded in the civil engineering community as a foremost expert on suspension bridge cables and design analysis.