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purlin
In architecture, structural engineering or building, a purlin (or historically purline, purloyne, purling, perling) is any longitudinal, horizontal, structural member in a roof except a type of framing with what is called a crown plate. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin and common purlin.
== Purlin plates in wooden construction==
A ''purlin plate'' in wooden construction is also called an "arcade plate" in European English,〔Harris, Richard. "Bays, frames and boxes." Discovering timber-framed buildings. 3rd revised ed. Aylesbury: Shire Publications, 1979. 10〕 "under purlin", and "principal purlin". The term plate means a major, horizontal, supporting timber. Purlin plates are beams which support the mid-span of rafters and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone could span thus allowing a wider building. Purlin plates are very commonly found in large, old barns in North America. A crown plate has similarities to a purlin plate but supports collar beams in the middle of a timber framed building.
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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