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Lattice girder
A lattice girder is a girder where the flanges are connected by a lattice web.〔(【引用サイトリンク】publisher=Merriam-Webster )〕
==Overview==
The lattice girder 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〔(【引用サイトリンク】publisher=University of Iowa Lichtenberger Engineering Library )〕 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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