Correlation of internal and external pressures and net pressure factors for cladding design

Bodhinayake, Geeth, Ginger, John, and Henderson, David (2020) Correlation of internal and external pressures and net pressure factors for cladding design. Journal of Wind and Structures, 30 (3). pp. 219-229.

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Abstract

Net pressures on roofs and walls of buildings are dependent on the internal and external pressure fluctuations. The variation of internal and external pressures are influenced by the size and location of the openings. The correlation of external and internal pressure influences the net pressures acting on cladding on different parts of the roof and walls. The peak internal and peak external pressures do not occur simultaneously, therefore, a reduction can be applied to the peak internal and external pressures to obtain a peak net pressure for cladding design. A 1:200 scale wind tunnel model study was conducted to determine the correlations of external and internal pressures and effective reduction to net pressures (i.e., net pressure factors, ????????) for roof and wall cladding. The results show that external and internal pressures on the windward roof and wall edges are well correlated. The largest ????????̌,????????????, highest correlation coefficient and the highest ???????? are obtained for different wind directions within 90o ≤ ???? ≤ 135o , where the large openings are on the windward wall. The study also gives net pressure factors ???????? for areas on the roof and wall cladding for nominally sealed buildings and the buildings with a large windward wall opening. These factors indicate that a 5% to 10% reduction to the action combination factor, ???????? specified in AS/NZS 1170.2(2011) is possible for some critical design scenarios.

Item ID: 62882
Item Type: Article (Research - C1)
ISSN: 1598-6225
Keywords: external pressure; internal pressure; net pressure; correlation; combination factor; pressure factor; wind load
Copyright Information: Copyright © 2020 Techno-Press, Ltd.
Date Deposited: 06 Aug 2020 06:00
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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