Fluctuating wind loads for cladding design

Henderson, David J., and Ginger, John D. (2010) Fluctuating wind loads for cladding design. In: Proceedings of The 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference 2010, pp. 150-155. From: 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference, 8-12 August 2010, Sydney, NSW, Australia.

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Abstract

Roofs during windstorms are subjected to intense fluctuating external pressures at the windward roof edges. Loads on these areas can be greatly increased when combined with large positive internal pressures resulting from a breached windward wall, giving a large net uplift load. Thus the roof envelope and fixings generally experiences the highest wind loads of the structural components, and are the components most susceptible to failure.

Peak cladding pressures derived from the corner and general roof areas for different building geometries representing typical low rise buildings have been determined using wind tunnel time series data. These pressures are significantly larger than design pressures derived from AS/NZS1170.2:2002.

Moving point load testing has demonstrated the elongated tributary area of typical pierced fixed cladding types. The influence coefficients developed from the point load testing were used in conjunction with an analysis of time series data from a high density tapped wind tunnel model to reveal the relationship of the conical vortices and the elongated tributary area for the pierced fixed cladding. The tributary area and appropriate relationship with the relevant pressure taps were used to show the validity of generating simulated cyclonic wind pressure traces using wind tunnel pressure time series data. From analyzing the generated traces it has been determined that the Australian wind loading design standard pressures are un-conservative for cladding design for a range of building configurations. Criteria for the strengthening of localized roof areas in existing building stock are proposed.

Item ID: 15904
Item Type: Conference Item (Refereed Research Paper - E1)
ISBN: 978-0-646-53727-6
Date Deposited: 06 Sep 2013 05:19
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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