In situ measurements of wind pressures on low slope membrane roofs. Issue 153 (June 2016)

• Record Type: Journal Article
• Authors: Bartko, Michal; Molleti, Sudhakar; Baskaran, Appupillai
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 153(2016)
• Page Start: 78
• Page End: 91
• Publication Date: 2016-06
• Subjects: Membrane roofs -- In situ measurements -- Wind pressure -- NBCC -- Roof zones -- Pressure coefficients -- Tributary area; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2016.03.010
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Pressure distributions created by wind flow on low slope roofs is an issue addressed by many wind tunnel studies and selective field experimental studies. Building codes and standards specify pressure coefficient data to determine the wind loads for commercial roofing claddings. Field measurements can provide valuable data to validate the current code provisions for wind loads, as well provide supporting data for existing wind uplift test methods for roof claddings. Thus the Special Interest Group on Dynamic Evaluation of Roofing Systems (SIGDERS) selected four locations (Ottawa, Vancouver, Mt. Pleasant and Rialto) across North America and collected wind speed, wind direction and wind pressure data for extended time periods to understand the wind interaction with low slope membrane roofs. This paper presents the data collected from November 2012 to November 2013 from the Ottawa, Ontario site. Based on the National Building Code of Canada׳s (NBCC) zoning procedure, pressure taps were installed to obtain data for the corner, edge and field roof zones. Occurrences of wind speed exceeding 16 m s −1 were considered for various wind directions. Peak and mean pressure coefficients were calculated and compared with NBCC (2010) 's specifications. When instantaneous peak pressure coefficients were compared with theNBCC (2010), the measured data exceeded NBCC (2010) 's specifications for some wind directions. Nevertheless, when the pressure coefficients were compared by paring with their respective tributary area, the data concluded that the currentNBCC (2010) 's specifications for the roof cladding and components are equally adequate for the wind load design of low slope membrane roofs. Highlights: Measurements on a building in service with the authentic roofing materials were made. Paper highlights several challenges of in situ wind speed and pressure measurements. Some calculated instantaneous pressure coefficients are higher than NBCC requirements. Pressure coefficients paired with tributary areas satisfy the NBCC 2010 provisions. NBCC design provisions for cladding and components are applicable for roof membrane.