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Abstract
Wind loads on components and cladding (C&C) are larger than those acting on the main structural system. Because of the combination of turbulence in the wind and the nature of building aerodynamics, high magnitude pressures can occur over the relatively small areas associated with building components. In contrast, the main structural system responds to pressures acting on multiple surfaces such that the highly-localized, intense pressure fluctuations are attenuated by the lack of full spatial and temporal correlations. Surry et al. (2007) illustrated this point, showing the differences between point pressures and spatial averages on the roof of a low-rise building. The wind load provisions in ASCE 7-10 (ASCE 2010) capture these effects, with higher pressures being applied for the design of C&C compared to those for the main wind-force resisting system (MWFRS). In fact, the C&C provisions indicate that the pressures decrease exponentially with area such that the design pressure coefficients, GCp, for 0.93 m2 (10 ft2) are approximately 40% of those for 9.3 m2 (100 ft2), for the corner zone on low-sloped roofs of low-rise buildings (e.g., see Fig. 30.4-2A in ASCE 7-10).
Wind loads on components and cladding (C&C) are larger than those acting on the main structural system. Because of the combination of turbulence in the wind and the nature of building aerodynamics, high magnitude pressures can occur over the relatively small areas associated with building components. In contrast, the main structural system responds to pressures acting on multiple surfaces such that the highly-localized, intense pressure fluctuations are attenuated by the lack of full spatial and temporal correlations. Surry et al. (2007) illustrated this point, showing the differences between point pressures and spatial averages on the roof of a low-rise building. The wind load provisions in ASCE 7-10 (ASCE 2010) capture these effects, with higher pressures being applied for the design of C&C compared to those for the main wind-force resisting system (MWFRS). In fact, the C&C provisions indicate that the pressures decrease exponentially with area such that the design pressure coefficients, GCp, for 0.93 m2 (10 ft2) are approximately 40% of those for 9.3 m2 (100 ft2), for the corner zone on low-sloped roofs of low-rise buildings (e.g., see Fig. 30.4-2A in ASCE 7-10).
Date
12/2019
12/2019
Author(s)
Gregory A. Kopp and Murray J. Morrison
Gregory A. Kopp and Murray J. Morrison
Page(s)
1-11
1-11
Keyword(s)
low-rise; buildings; low-slope; ASCE; zones; pressure
low-rise; buildings; low-slope; ASCE; zones; pressure