perma-joists
a fellow engineer is looking for information on a steel joist called perma-joist(on the drawings). the date of the building is the 1950's and they are used in the roof structure of a school building. i am assuming that this may be just a manufacture's name for a steel joist. does any one have any information on perma-joists?
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发表于 2009-9-15 12:10:09
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