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Title: Camber

is it possible for camber in a member used as a flat slab form purlin to dissappear following its design load application ?

spec'd 3/4" midspan camber in simple span channel to be reused in repeat bay forming system application.
design stress under wet concrete loading was 65% of allowable.
am i not in the elastic range and should i not see the camber return upon from and purlin removal ?

channels are dead straight now and fabricator is arguing that the camber "dissappears" following use, even with no current load in the channel.

thoughts ?


robert d. rollo, PE
Corporate Associate
Parkhill, Smith & Cooper, Inc.
Lubbock, Texas
(806) 761-7539vox
(806) 747-7146 fax