Long-span bridges

Details Long-span bridges Long-span bridges

1981-12-29

1984-06-05

Purser, Ernest R.

Bridges

Suspension

14 1, 14 73, E01D 1100, E01D 1700

Patent

active

044519508

ABSTRACT:
A suspension bridge has a first deck supported from a pair of suspension cables by hangers and a second deck independently supported from a pair of suspension cables by hangers. The two parallel decks are separated by a gap whose width is not less than that of either of the decks and is preferably three or more times the width of a deck. The decks are joined at intervals along their length by stiff transverse girders 22 and intervening diagonal shear braces so that the two decks behave essentially as a single rigid body in regard to torsional movement. This results in very high aerodynamic damping of both torsional and bending modes of oscillation.

REFERENCES:
patent: 629935 (1899-08-01), Sturgis
patent: 1895734 (1933-01-01), Rush
patent: 2333391 (1943-11-01), Robinson
patent: 2642598 (1953-06-01), Beretta
patent: 3211110 (1965-10-01), Pierson
patent: 3406616 (1968-10-01), McLean
"Tubular Arches Support Water Pipelines", from Acier-Stahl-Steel, vol. 36, Mar. 1971, p. 140.

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