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Encyclopedia > Cantilever bridge
Cantilever bridge
The Firth of Forth rail bridge with its three double cantilevers
Ancestor Beam bridge, Truss bridge
Related None
Descendant None
Carries Pedestrians, automobiles, trucks, light rail, heavy rail
Span range Short to medium
Material Iron, structural steel, prestressed concrete
Movable No
Design effort Medium
Falsework required No

A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete. The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1500 feet, and can be more easily constructed at difficult crossings by virtue of using little or no falsework. This article is about the dental profession. ... A dental bridge is a prosthesis used in place of missing teeth and may be removable or permanently attached. ... Forth Bridge, Firth of Forth, Edinburgh - a photo taken by myself and in the public domain. ... For the nearby road bridge, see Forth Road Bridge. ... A steel pedestrian footbridge over the a busy road in Swansea, typical of many beam bridges A beam bridge is a direct descendant of the log bridge now made from steel I beams, box beams (hollow rectangular tubes), reinforced concrete, or post-tensioned concrete (concrete with tubes for cable tendons). ... A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. ... Look up Pedestrian in Wiktionary, the free dictionary. ... “Car” and “Cars” redirect here. ... For other uses, see Truck (disambiguation). ... This article is about light rail systems in general. ... The term heavy rail is often used for regular railways, to distinguish from systems such as trams/light rail and metro. ... For other uses, see Iron (disambiguation). ... Structural steel is steel construction material, a profile, formed with a specific shape or cross section and certain standards of chemical composition and strength. ... Traditional reinforced concrete is based on the use of steel reinforcement bars, rebar, inside poured concrete. ... Falseworks are temporary structures used in the building of bridges and other arched structures in order to hold the item in place until its building is sufficiently far advanced to support itself. ... This article is about the edifice (including an index to articles on specific bridge types). ... A schematic image of two cantilevers. ... A footbridge over a road A footbridge is a bridge designed for pedestrians rather than vehicular traffic. ... A statically determinate beam, bending under an evenly distributed load. ... In medicine, a truss is a kind of surgical appliance, particularly one used for hernia patients. ... Structural steel is steel construction material, a profile, formed with a specific shape or cross section and certain standards of chemical composition and strength. ... Traditional reinforced concrete is based on the use of steel reinforcement bars, rebar, inside poured concrete. ... Falseworks are temporary structures used in the building of bridges and other arched structures in order to hold the item in place until its building is sufficiently far advanced to support itself. ...


A simple cantilever span is formed by two cantilever arms extending from opposite sides of the obstacle to be crossed, meeting at the center. In a common variant, the suspended span, the cantilever arms do not meet in the center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or constructed in place using special traveling supports. A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. ...


A common way to construct steel truss and prestressed concrete cantilever spans is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction, forming a balanced cantilever; when they attach to a solid foundation, the counterbalancing arms are called anchor arms. Thus, in a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms which extend away from the obstacle. Because of the need for more strength at the balanced cantilever's supports, the bridge superstructure often takes the form of towers above the foundation piers. The Commodore Barry Bridge is an example of this type of cantilever bridge. The Commodore Barry Bridge is a cantilever bridge that spans the Delaware River from Chester, Pennsylvania to Bridgeport, New Jersey, USA. It is named after the American Revolutionary War hero and Philadelphia resident, John Barry. ...

The Pierre Pflimlin bridge is balanced cantilever of concrete under construction using traveling cantilever supports for formwork at each end, about 2/3rds of the maximum length. Most such bridges will employ at least two units of this type and some may have ten or more.
The Pierre Pflimlin bridge is balanced cantilever of concrete under construction using traveling cantilever supports for formwork at each end, about 2/3rds of the maximum length. Most such bridges will employ at least two units of this type and some may have ten or more.

Steel truss cantilevers support loads by tension of the upper members and compression of the lower ones. Commonly, the structure distributes the tension via the anchor arms to the outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads. Image File history File links Size of this preview: 800 × 360 pixelsFull resolution (889 × 400 pixel, file size: 205 KB, MIME type: image/jpeg) Derived from this image Original image File historyClick on a date/time to view the file as it appeared at that time. ... Image File history File links Size of this preview: 800 × 360 pixelsFull resolution (889 × 400 pixel, file size: 205 KB, MIME type: image/jpeg) Derived from this image Original image File historyClick on a date/time to view the file as it appeared at that time. ... The bridge being built over the Rhine south of Strasbourg. ... Tension is a reaction force applied by a stretched string (rope or a similar object) on the objects which stretch it. ... Physical compression is the result of the subjection of a material to compressive stress, resulting in reduction of volume. ... In statics, a construction is statically indeterminate when the static equilibrium equations are not sufficient to calculate the reactions on that construction. ...



Prestressed concrete balanced cantilever bridges are often built using segmental construction. As its name implies, a segmental bridge is a bridge built in short sections (called segments), i. ...

Contents

Use of cantilevers during construction of arch bridges

Some steel arch bridges (such as the Navajo Bridge) are built using pure cantilever spans from each side, with neither falsework below nor temporary supporting towers and cables above. These are then joined with a pin, usually after forcing the union point apart, and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge. Such unsupported construction is only possible where appropriate rock is available to support the tension in the upper chord of the span during construction, usually limiting this method to the spanning of narrow canyons. Navajo Bridge crosses the Colorado Rivers Marble Canyon near Lees Ferry, Arizona. ... A truss arch bridge combines elements of a truss and an arch. ...


List by length

World's longest cantilever bridges (by longest span) [1]

  1. Quebec Bridge (Quebec, Canada) 1,800 feet (549 m)
  2. Forth Bridge (Firth of Forth, Scotland) 2 x 1,710 feet (521 m)
  3. Minato Ohashi Bridge (Osaka, Japan) 1,673 feet (510 m)
  4. Commodore Barry Bridge (Chester, Pennsylvania, USA) 1,644 feet (501 m)
  5. Crescent City Connection (dual spans) (New Orleans, Louisiana, USA) 1,575 feet (480 m)
  6. Howrah Bridge (Calcutta, India) 1,500 feet (457 m)
  7. Veterans Memorial Bridge (Gramercy, Louisiana, USA) 1,460 feet (445 m)
  8. San Francisco-Oakland Bay Bridge (East Bay Span) (San Francisco, California, USA) 1,400 feet (427 m)
  9. Horace Wilkinson Bridge (Baton Rouge, Louisiana, USA) 1,235 feet (376 m)
  10. Tappan Zee Bridge (New York, New York, USA) 1,212 feet (369 m)

The Quebec Bridge (Pont de Québec in French) in Canada crosses the lower Saint Lawrence River to the west of Quebec City, and Lévis, Quebec. ... , Motto: Je me souviens (French: I remember) Capital Quebec City Largest city Montreal Official languages French Government - Lieutenant-Governor Pierre Duchesne - Premier Jean Charest (PLQ) Federal representation in Canadian Parliament - House seats 75 - Senate seats 24 Confederation July 1, 1867 (1st) Area  Ranked 2nd - Total 1,542,056 km² (595... For the nearby road bridge, see Forth Road Bridge. ... The Firth of Forth from Calton Hill The Forth Bridges cross the Firth Satellite photo of the Firth and the surrounding area Map of the Firth Firth of Forth (Scottish Gaelic: Linne Foirthe) is the estuary or firth of Scotlands River Forth, where it flows into the North Sea... This article is about the country. ... The Commodore Barry Bridge is a cantilever bridge that spans the Delaware River from Chester, Pennsylvania to Bridgeport, New Jersey, USA. It is named after the American Revolutionary War hero and Philadelphia resident, John Barry. ... Chester is a city in Delaware County, Pennsylvania, population 36,854 at the 2000 census. ... The Crescent City Connection, abbreviated as CCC, (formerly the Greater New Orleans Bridge) refers to twin cantilever bridges, that carry U.S. Route 90 Business over the Mississippi River in New Orleans, Louisiana. ... NOLA redirects here. ... The Howrah Bridge spans the Hooghly River, linking Howrah to Kolkata, India - the busiest cantilever bridge in the world. ... This article is on Calcutta/Kolkata, the city. ... The Veterans Memorial Bridge, also known as the Gramercy Bridge, is a truss bridge over the Mississippi River connecting Gramercy, Louisiana in St. ... Gramercy is a town located in St. ... The San Francisco-Oakland Bay Bridge ( ; known locally as the Bay Bridge) is a toll bridge which spans San Francisco Bay and links the California cities of Oakland and San Francisco in the United States, as part of Interstate 80. ... “San Francisco” redirects here. ... The Horace Wilkinson Bridge is a cantilever bridge carrying Interstate 10 across the Mississippi River in Baton Rouge, Louisiana. ... For the Canadian restaurant, see Baton Rouge (restaurant). ... The Governor Malcolm Wilson Tappan Zee Bridge, almost always referred to as the Tappan Zee Bridge or simply the Tappan Zee (though this can cause confusion with the body of water for which it is named) is a cantilever bridge in New York over the Hudson River at its widest... Midtown Manhattan, looking north from the Empire State Building, 2005 New York City (officially named the City of New York) is the most populous city in the state of New York and the entire United States. ...

Examples

The distribution of forces is clear in this demonstration using chairs, poles, counterweights, and humans
The distribution of forces is clear in this demonstration using chairs, poles, counterweights, and humans
Quebec Bridge is of the general structure demonstrated above
Quebec Bridge is of the general structure demonstrated above
The Howrah Bridge in Kolkata, India was opened in February 1943
The Howrah Bridge in Kolkata, India was opened in February 1943

Following are some different types of cantilever bridge. Image File history File links Size of this preview: 800 × 506 pixelsFull resolution (1600 × 1011 pixel, file size: 310 KB, MIME type: image/png) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Cantilever bridge ... Image File history File links Size of this preview: 800 × 506 pixelsFull resolution (1600 × 1011 pixel, file size: 310 KB, MIME type: image/png) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Cantilever bridge ... Image File history File links Picture of the Quebec bridge with Pierre-Laporte bridge in background, in Quebec city , by Pierre Lachance, taken from http://recitmst. ... Image File history File links Picture of the Quebec bridge with Pierre-Laporte bridge in background, in Quebec city , by Pierre Lachance, taken from http://recitmst. ... The Quebec Bridge (Pont de Québec in French) in Canada crosses the lower Saint Lawrence River to the west of Quebec City, and Lévis, Quebec. ... Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... The Howrah Bridge spans the Hooghly River, linking Howrah to Kolkata, India - the busiest cantilever bridge in the world. ... , “Calcutta” redirects here. ...

Jeremiah Morrow Bridge is a deck truss cantilever bridge, with the roadway running on top of the truss
Newark Bay Bridge has arched cantilevers
Vejle Fjord Bridge is a concrete bridge built using the balanced cantilever method
Vejle Fjord Bridge is a concrete bridge built using the balanced cantilever method

See also


  Results from FactBites:
 
Cantilever bridges - Design Technology (0 words)
Cantilever bridges normally use pairs of cantilevers back to back with a short beam bridge in between the cantilevers.
The intentions for the bridge was that it would carry a railway engine and carriages up to 260 metres from the nearest support which at the time was quite an ambitious project.
The bridge was designed and built by Benjamin Baker in the late 1880's and was one of the first cantilever bridges to be constructed.
Cantilever Bridge (580 words)
A dental bridge is a false tooth, known as a pontic, which is fused between two porcelain crowns (a porcelain cap which covers the crown of the tooth) to fill in the area left by a missing tooth.
The need for a dental bridge and specifically the cantilever bridge is obvious, however a bonus feature of this type of dental procedure is that the appearance after surgery is a natural one.
Dental bridges do however have some disadvantages though in that it is common for your teeth to be mildly sensitive to extreme temperatures for a few weeks after the treatment.
  More results at FactBites »

 
 

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