Lattice girder

Lattice girder
Darcy Lever lattice girder railway bridge, Lancashire
This example shows laced struts and ties. Pure tension eyebars are seen in the background (this is the cantilever portion of the eastern span of the San Francisco – Oakland Bay Bridge)

A lattice girder is a girder where the flanges are connected by a lattice web.[1] This type of design has been supplanted in modern construction with welded or bolted plate girders, which use more material but have lower fabrication and maintenance costs. The lattice girder was used prior to the development of larger rolled steel plates.

The term is also sometimes used to refer to a structural member commonly made using a combination of structural sections connected with diagonal lacing. This member is more correctly referred to as a laced strut[2] or laced tie, as it normally resists axial compression (strut) or axial tension (tie); the 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 with modern technology. In some case seismic retrofit modifications replace riveted lacing with plates bolted in place.

Contents

Some structures employing lattice girders

Some structures employing laced struts or ties

See also

References

  1. ^ "Definition of lattice girder". Merriam-Webster. http://webster.com/dictionary/lattice+girder. Retrieved 2006-12-13. 
  2. ^ "Glossary of bridge terminology". University of Iowa Lichtenberger Engineering Library. http://sdrc.lib.uiowa.edu/eng/bridges/WaddellGlossary/GlossL.htm. Retrieved 2006-12-13. 

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  • Lattice girder — Girder Gird er, n. [From {Gird} to encircle.] [1913 Webster] 1. One who, or that which, girds. [1913 Webster] 2. (Arch. & Engin.) A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence …   The Collaborative International Dictionary of English

  • Lattice girder — Lattice Lat tice, n. [OE. latis, F. lattis lathwork, fr. latte lath. See {Latten}, 1st {Lath}.] 1. Any work of wood, metal, plastic, or other solid material, made by crossing a series of parallel laths, or thin strips, with another series at a… …   The Collaborative International Dictionary of English

  • lattice girder — noun or lattice beam or lattice frame : a girder with top and bottom flanges connected by a latticework web * * * a trusslike girder having the upper and lower chords connected by latticing. [1850 55] * * * lattice girder, a girder, especially of …   Useful english dictionary

  • lattice-girder — lattˈice girdˈer noun A girder composed of upper and lower members joined by a web of crossing diagonal bars • • • Main Entry: ↑lattice …   Useful english dictionary

  • lattice girder — noun Date: 1852 a girder with top and bottom flanges connected by a latticework web …   New Collegiate Dictionary

  • lattice girder — a trusslike girder having the upper and lower chords connected by latticing. [1850 55] * * * …   Universalium

  • Half-lattice girder — Girder Gird er, n. [From {Gird} to encircle.] [1913 Webster] 1. One who, or that which, girds. [1913 Webster] 2. (Arch. & Engin.) A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence …   The Collaborative International Dictionary of English

  • Girder — Gird er, n. [From {Gird} to encircle.] [1913 Webster] 1. One who, or that which, girds. [1913 Webster] 2. (Arch. & Engin.) A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence, a… …   The Collaborative International Dictionary of English

  • Girder bridge — Girder Gird er, n. [From {Gird} to encircle.] [1913 Webster] 1. One who, or that which, girds. [1913 Webster] 2. (Arch. & Engin.) A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence …   The Collaborative International Dictionary of English

  • Lattice — Lat tice, n. [OE. latis, F. lattis lathwork, fr. latte lath. See {Latten}, 1st {Lath}.] 1. Any work of wood, metal, plastic, or other solid material, made by crossing a series of parallel laths, or thin strips, with another series at a diagonal… …   The Collaborative International Dictionary of English

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