San Francisco Oakland Bay Bridge Retrofit 3

A lattice girder is a truss girder where the load is carried by a web of latticed metal.

Overview

The lattice girder was used prior to the development of larger rolled steel plates. It has been supplanted in modern construction with welded or

bolted The BOLT Browser was a web browser for mobile phones including feature phones and smartphones that can run Java ME applications. The BOLT Browser was offered free of charge to consumers and by license to mobile network operators and handset manu ...

plate girders, which use more material but have lower fabrication and maintenance costs. The term is also sometimes used to refer to a laced strut or laced tie, structural members commonly made using a combination of structural sections connected with diagonal lacing. This form allows a strut to resist axial compression and a (

tie Tie has two principal meanings: * Tie (draw), a finish to a competition with identical results, particularly sports * Necktie, a long piece of cloth worn around the neck or shoulders Tie or TIE may also refer to: Engineering and technology * Ti ...

) to resist axial tension. A lattice girder, like any girder, primarily resists bending. The component sections may typically include metal beams, channel and angle sections, with the lacing elements either metal plate strips, or angle sections. The lacing elements are typically attached using either hot rivets or threaded locator bolts. As with lattice girders, laced struts and ties have generally been supplanted by hollow box sections, which are more economic to produce with modern technology. In some case seismic retrofit modifications replace riveted lacing with plates bolted in place.

Examples of lattice girders

Manhattan Bridge The Manhattan Bridge is a suspension bridge that crosses the East River in New York City, connecting Lower Manhattan at Canal Street with Downtown Brooklyn at the Flatbush Avenue Extension. The main span is long, with the suspension cables be ...

* Runcorn Railway Bridge *

Kew Railway Bridge Kew Railway Bridge spans the River Thames in London, England, between Kew and Strand-on-the-Green, Chiswick. The bridge was opened in 1869. History The bridge, which was given Grade II listed structure protection in 1983, was designed by ...

Dowery Dell Dowery Dell, between Rubery and Halesowen in Worcestershire, was a , nine span lattice steel, single-track railway viaduct that carried the Halesowen to Longbridge railway. A 10 mph speed limit was in operation. The line opened in 1883. Train ...

Viaduct * Bennerley Viaduct *

Cayey Bridge The Cayey Bridge, also known as Puente de Cayey, is an iron lateral lattice girder bridge in Puerto Rico that was built in 1891. It brings Puerto Rico Highway 15 over the Guamaní River. It is an extremely rare example of such a bridge in the U ...

Dalguise Viaduct The Dalguise Viaduct is a lattice girder viaduct in Dalguise, Perth and Kinross, Scotland.Dalguise, Tay ...

Viaduc d'Ormaiztegi The Viaduc d'Ormaiztegi or Ormaiztegi Viaduct is a lattice girder viaduct in Ormaiztegi, Spain that was formerly used by a railroad to link a line from Madrid to Irun. It is now considered a historical monument. History The viaduct was designe ...

Examples of laced struts or ties

*The Eiffel Tower. *The obsolescent eastern span of the

San Francisco–Oakland Bay Bridge The San Francisco–Oakland Bay Bridge, known locally as the Bay Bridge, is a complex of bridges spanning San Francisco Bay in California. As part of Interstate 80 in California, Interstate 80 and the direct road between San Francisco and Oakland ...

. The western span has been retrofitted with bolted plates replacing the lacing for added strength. The eastern span has been replaced. *The internal structure of the

Statue of Liberty The Statue of Liberty (''Liberty Enlightening the World''; French: ''La Liberté éclairant le monde'') is a List of colossal sculpture in situ, colossal neoclassical sculpture on Liberty Island in New York Harbor in New York City, in the U ...

. *The sides of the

Cape Fear Memorial Bridge The Cape Fear Memorial Bridge is a steel vertical-lift bridge in North Carolina, USA. It carries US 17/ US 76/ US 421 across the Cape Fear River between Brunswick County and New Hanover County. It also carried U.S. Route 74 unti ...

. *Certain viaducts of the

Chicago "L" The Chicago "L" (short for "elevated") is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of Illinois. Operated by the Chicago Transit Authority (CTA), it is the fourth-largest rapid tr ...

system.

References

{{Reflist Girders Trusses Girder

Overview

Examples of lattice girders

Examples of laced struts or ties

See also

References