|Function / usage:||
Tramway, light or metro rail bridge
Manhattan, New York, New York, USA
Brooklyn, New York, New York, USA
Brooklyn Bridge (1883)
|Coordinates:||40° 42' 28.00" N 73° 59' 28.00" W|
|main span||448.1 m|
|total length||2 089 m|
|height above valley floor or water||41.1 m|
|cables||number of cables||4|
|strands per cable||37|
|wires per strand||256|
|cable diameter||53.975 cm|
|total number of wires per cable||9 472|
|deck||deck depth||7.3 m|
|deck width||36.6 m|
|main bridge||span lengths||221.0 m - 448.1 m - 221.0 m|
|cost of construction||United States dollar 31 084 705.00|
|1 October 1901||
|1 August 1908||
Construction of the main cable begins.
|10 December 1908||
Main cable construction completed.
|31 December 1909||
Using wooden planks placed on the stringers, the bridge is first opened, although it is not yet completed.
Completion of the bridge.
Manhattan bridge was the first, bridge to have a 21 inch diameter main cable, largest at that time. It is still the strongest of the four east river bridges. The bridge originally was going to be a parallel wire cable suspension bridge, then an eyebar and chain type bridge, then finally reverted back to a parallel wire cabled suspension bridge. Both upper roadways of the bridge originally had  tracks for street cars [trolleys]. As time progressed, the tracks were removed to convert the roadways for vehicular traffic.
Manhattan bridge was the first suspension bridge to use flexible steel towers, unlike some other bridges such as the Williamsburg and the George Washington that used braced steel towers. The Manhattan bridge was the first modern steel suspension bridge to use a Warren type stiffening truss. It was the first modern steel suspension bridge to use two suspender ropes straddled over the main cables to attach to the floor beams.
Decorative spheres on top of the towers serve no function. Below them rest the saddles for the main cables. Leon Moisseiff was also advisory engineer of design of the Great George Washington Bridge. [Text contributed by Dave Frieder]
Relevant Web Sites
- The Washington Bridge over the Harlem River, at 181st Street, New York City, L. von Rosenberg, New York (USA), 1890
- Great American Bridges and Dams, John Wiley & Sons, New York (USA), ISBN 0471143855, 1984; pp. 136
- Construction of Parallel Wire Cables for Suspension Bridges, John A. Roebling's Sons Company, Trenton (USA), 1925
- Advances in Cable-Supported Bridges, Taylor & Francis, Abingdon (United Kingdom), ISBN 0415419824, 2006
- Cable anchorage repairs on New York City suspension bridges presented at Extending the Lifespan of Structures, IABSE Symposium, San Francisco, August 1995.
- Les grands ponts du monde: Hors d'Europe, Brissaud, Poitiers (France), ISBN 2902170688, 1990; pp. 119-120
- The Bridges of New York, Dover Publications Inc., Mineola (USA), ISBN 048641230X, 2000; pp. 40-57
- Sensors working overtime in "Bridge Design & Engineering", 2nd Quarter 2009, n. 55 v. 15
- New York City für Architekten, Heike Werner Verlag, Munich (Germany), ISBN 3980947106, 2004; pp. 264
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