Negative External Pressure Coefficients for Design of Components and Cladding of Low-Rise Buildings with Steep-Slope Gable Roofs
Publication: Journal of Aerospace Engineering
Volume 34, Issue 1
Abstract
Negative external pressure coefficients for design of components and cladding of steep-slope gable roofs (27° to 45° roof slope) on low-rise buildings subjected to wind loads were determined in this study based on data from wind tunnel tests of small-scale building models. The effect of exposure and building height were removed from the wind tunnel data, and the peak negative external pressure coefficients were determined using a Gumbel-fitting method. The spatial distribution of area-averaged peak negative external pressure coefficients was examined, and the results indicate that the effect of roof slope is not significant and that the largest magnitude peak negative external pressure coefficients do not always occur in the roof corner zone. Roof zones and equations for negative external pressure coefficients from current ASCE standard are generally in close agreement with the values based on wind tunnel test data, but negative external pressures on the roof edge normal to ridge and near ridge are underestimated. Modified roof zones and equations developed in this study are shown to improve the agreement with wind tunnel test data.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (data analyzing scripts).
Acknowledgments
The research was supported in part by the Insurance Institute for Business and Home Safety (IBHS) and by the University of Wyoming. The views expressed in this paper are those of the authors and do not necessarily reflect the views of those acknowledged.
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Published In
Journal of Aerospace Engineering
Volume 34 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 16, 2019
Accepted: Aug 5, 2020
Published online: Sep 28, 2020
Published in print: Jan 1, 2021
Discussion open until: Feb 28, 2021
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