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Burr Truss : ウィキペディア英語版
Burr Truss

The Burr Arch Truss — or simply Burr Truss or Burr Arch — is a combination of an arch and a ''multiple kingpost'' truss design. It was invented in 1804 by Theodore Burr, patented on April 3, 1817, and used in bridges, usually covered bridges.〔(【引用サイトリンク】 publisher = The Theodore Burr Covered Bridge Society of PA, Inc )
==Design==
The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. The opposite view is also held, based on computer models, that the truss performs the majority of the load bearing and the arch provides the stability.〔 Either way, the combination of the arch and the truss provides a more stable bridge capable of supporting greater weight than either the arch or truss alone.



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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