Experimental and analytical investigation of ponding load effects on a steel joist roof system Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mk61rm94b

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  • Ponding of water on roof systems leading to collapse causes expensive damage and jeopardizes the life safety of building occupants. Current building codes and design specifications for flat roof systems offer minimal guidance in designing for ponding loads. The present research investigated ponding load effects on a long span, lightweight roof system. A numerical study confirmed the established ponding stability theory and found that pitch does not provide large benefits until it becomes steeper than required by current specifications. Two full-scale roof systems consisting of steel joists, steel decking, rigid insulation, lateral bridging and roofing membrane (one flat and one on a 1/48 pitch) were designed, built, and loaded to failure under ponding water to permit detailed investigation of ponding load effects. Experimental results showed that the responses of both roofs were similar, that failure in both cases resulted from buckling of the joist top chord angles near midspan and that the total load on the roofs exceeded the specified strengths. Recommendations for future designs include proportioning the roof structure to support accumulated water to the level of the parapet wall and designing decking for the maximum water load that can accumulate at the lowest elevation of the roof.
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