Panelized Residential Roof System. I: Structural Design
Publication: Journal of Architectural Engineering
Volume 23, Issue 4
Abstract
Two roof panel designs for residential applications were developed to span from ridge to soffit without intermediate supports. The two designs, the truss core and the stiffened plate, incorporate both structural and insulation features such that a conditioned attic space can be achieved. The structural component of the truss-core and stiffened-plate panels is fabricated from steel webs laser welded to steel face sheets. The truss core includes an exterior (roof side) and interior (attic side) face sheet, whereas the stiffened plate includes only an interior face sheet. A separate polyurethane foam insulating layer is located on either the panel interior or exterior face. Structural performance requirements are developed from residential building codes for web failure, flexural capacity, and deflection. The structural analysis includes dead, live, and wind loads for all three U.S. climate zones. A model for panel performance was developed and validated through prototype panel tests. Truss-core and stiffened-plate panel designs were identified that satisfy the loading requirements for horizontal spans ranging from 3 to 8 m. Stiffened-plate panels are generally lighter weight than truss-core panels by 10–25%. However, only the truss-core panel satisfies the most extreme loading case for 8-m roof spans.
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Acknowledgments
This work was supported by the U.S. Department of Energy (DOE) (Award DE-FC26-04NT42114) and cost sharing from the University of Minnesota Initiative for Renewable Energy and the Environment and the College of Science and Engineering. Any opinions, findings, conclusions, or recommendations expressed herein are those of the author(s) and do not necessarily reflect the views of the DOE.
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Published In
Journal of Architectural Engineering
Volume 23 • Issue 4 • December 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Sep 20, 2016
Accepted: Jun 22, 2017
Published online: Aug 11, 2017
Published in print: Dec 1, 2017
Discussion open until: Jan 11, 2018
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