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原文传递 Air-Permeability Factor for Wind Loads on Loose-Laid Pavers on Flat Roofs

题名：	Air-Permeability Factor for Wind Loads on Loose-Laid Pavers on Flat Roofs
正文语种：	英文
作者：	Tibebu H. Birhane; G. T. Bitsuamlak; Meseret T. Kahsay;Anwar D. Awol
作者单位：	Univ, of Western Ontario
关键词：	Wind load; Air-permeability factor; Roof pavers; Parapets; Pressure equalization; WindEEE Dome; Large-scale windtesting; Roof pressure coefficients
摘要：	Installation of open-joint roof paver systems with pedestals on flat roofs leaves a cavity between pavers and roof deck, allowing the development of cavity pressure. The cavity suction on roof pavers reduces the net wind uplift and overturning. This study conducted pressure measurements of the paved roof of a large-scale building model using the University of Western Ontario's WindEEE Dome. The airpermeability factor was evaluated as a ratio of directional envelopes of peak net-pressure coefficients of the paved roof to peak external pressure coefficients of the bare roof. The air-permeability factors varied with pavers' location across the roof, and wind uplift load decreased 40% for pavers in the comer and edge roof zones. Moreover, pressure tests conducted on roofs with high perimeter parapets showed that airpermeability effects of pavers and shielding effects of perimeter parapets can be treated as independent aerodynamic factors for evaluating the net uplift wind loads on rooftop pavers. Therefore the overall effect can be obtained simply by multiplying the roof pressure on bare flat roofs by air-permeability and parapet factors.
出版日期：	2020
出版年：	2020
期刊名称：	Journal of Structural Engineering
卷：	Vol.146
期：	No.08
页码：	04020151