The objective of the Standing Seam Roof Systems Research Project at the
Virginia Polytechnic Institute and State University is to develop a design
procedure for the strength of Z-purlin supported standing seam roof systems
under gravity leading. Various approaches were taken to calculate the strength of
systems with either torsional restraint, third point span restraint, or midspan
restraint. Since few test results are available for single and three span
continuous, two purlin line systems, the primary focus of this research is
analytical. Even though the test setup used for these tests does not represent
actual field conditions, the data obtained will be extremely useful in the
development of analytical models to predict system strength. However, at least
four multiple purlin line tests will be required to verify the accuracy of the design
procedure. The analytical formulation will include the effects of sliding friction in
the clips and "drape" restraint effects of the standing seam deck.
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