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Self-anchored suspension bridge
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Self-anchored suspension bridge : ウィキペディア英語版
Self-anchored suspension bridge

A self-anchored suspension bridge is a suspension bridge in which the main cables attach to the ends of the deck, rather than to the ground via large anchorages. The design is well-suited for construction atop elevated piers, or in areas of unstable soils where anchorages would be difficult to construct.

Image:Bridge-suspension-anchorages.svg|Suspension bridge with the main cables attached to the ground (black squares)
Image:Bridge-self-anchored.svg|Self-anchored suspension bridge; the main cables are attached to the end of the road deck

The load path of the self-anchored suspension (SAS) bridge converts vertical loads into tension forces in the main cables which are countered by compressive forces in the tower(s) and deck. The system balances forces internally without external anchorage requirements making it suitable for sites where large horizontal forces are difficult to anchor. This is similar to the method used in a tied-arch bridge where arch member compression is balanced by tension in the deck.
==History==
The self-anchored suspension bridge form originated in the mid-19th century, with a published description by Austrian engineer Josef Langer in 1859 and U.S. Patent No. 71,955 by American engineer Charles Bender in 1867. The form was applied to a handful of Rhine River crossings in Germany during the first half of the twentieth century.〔John A. Ochsendorf and David P. Billington, "Self-Anchored Suspension Bridges," ''ASCE Journal of Bridge Engineering,'' vol. 4, No. 3 (August 1999): 151-156.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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