Techno Press
Techno Press

Wind and Structures   Volume 21, Number 1, July 2015, pages 1-23
Wind pressure characteristics of a low-rise building with various openings on a roof corner
Yunjie Wang and Q.S. Li

Abstract     [Full Text]
    Wind tunnel testing of a low-rise building with openings (holes) of different sizes and shapes on a roof corner is conducted to measure the internal and external pressures from the building model. Detailed analysis of the testing data is carried out to investigate the characteristics of the internal and external pressures of the building with different openings\' configurations. Superimposition of the internal and external pressures makes the emergence of positive net pressures on the roof. The internal pressures demonstrate an overall uniform distribution. The probability density function (PDF) of the internal pressures is close to the Gaussian distribution. Compared with the PDF of the external pressures, the non-Gaussian characteristics of the net pressures weakened. The internal pressures exhibit strong correlation in frequency domain. There appear two humps in the spectra of the internal pressures, which correspond to the Helmholtz frequency and vortex shedding frequency, respectively. But, the peak for the vortex shedding frequency is offset for the net pressures. Furthermore, the internal pressure characteristics indirectly reflect that the length of the front edge enhances the development of the conical vortices.The objective of this study aims to further understanding of the characteristics of internal, external and net pressures for low-rise buildings in an effort to reduce wind damages to residential buildings.
Key Words
    low-rise building; wind tunnel testing; wind loading; internal pressure; external pressure; net pressure; separation bubble; conical vortex
Yunjie Wang: College of Civil Engineering, Hunan University, Changsha 410082, P.R. China
Q.S. Li: Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong

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