Abstract
ABSTRACTStanding seam roofs are the most common metal roofing system in use by industry due to their energy efficiency and proven weather tightness. The only benefit lost by using standing seam roofing is the lateral support of the roof purlins due to the panels being screwed directly into the purlins. Because of this lack of lateral support, an independent bracing system is required to provide lateral-torsional bracing to purlins supporting a standing seam roof system. This research conducted 20 tests with several different torsional diaphragm designs, bracing locations, different Z purlin depths, thicknesses and spans. The tests performed meet the provisions of the “Base Test Method for Purlins Supporting a Standing Seam Roof System” per AISI S908-8. Results were compared to Section D6.3.2 in AISI S100 and reduction factors were calculated per AISI S908-08. This investigation found that if torsional braces were designed and installed properly, they had a large effect on stiffening a standing seam roof system. Likewise, a standing seam roof did provide a small amount of lateral stiffness. Importantly, the flexural strength of the sections tested (Mts) was always greater than the calculated flexural strength of a fully constrained beam (Mnt) using Section C31.1(a) of AISI S100.
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