[1] Dong Xin, Ye Jihong,. Wind tunnel test for wind pressure characteristics on a saddle roof [J]. Journal of Southeast University (English Edition), 2010, 26 (3): 436-443. [doi:10.3969/j.issn.1003-7985.2010.03.013]

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 3

Page:

436-443

Research Field:

Civil Engineering

Publishing date:

2010-09-30

Info

Title:

Wind tunnel test for wind pressure characteristics on a saddle roof

Author(s):

Dong Xin;  Ye Jihong

Key Laboratory of Concrete and Pre-Stressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China

Keywords:

saddle roof;  mechanism of wind pressure distribution;  wind pressure spectra;  non-Gaussian feature

PACS:

TU312

DOI:

10.3969/j.issn.1003-7985.2010.03.013

Abstract:

The wind pressure characteristics on a saddle roof at wind direction along the connection of the low points are systematically studied by the wind tunnel test. First, the distributions of the mean and the fluctuating pressures on the saddle roof are provided. Through the wind pressure spectra, the process of generation, growth and break down of the vortex on the leading edge is presented from a microscopic aspect and then the distribution mechanism of the mean and fluctuating pressures along the vulnerable leading edge is explained. By analysis of the wind pressure spectra near the high points, it can be inferred that the body induced turbulence reflects itself as a high-frequency pressure fluctuation. Secondly, the third- and fourth-order statistical moments of the wind pressure are employed to identify the non-Gaussian nature of the pressure time history and to construct an easy tool to localize regions with a non-Gaussian feature. The cause of the non-Gaussian feature is discussed by virtue of the wind pressure spectra. It is concluded that the non-Gaussian feature of the wind pressure originates from the effects of flow separation and body-induced turbulence, and the former effect plays an obvious role.

References:

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Memo

Memo:

Biographies: Dong Xin(1982—), female, graduate; Ye Jihong(corresponding author), female, doctor, professor, yejihong@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.50678036), Jiangsu Civil Engineering Graduate Center for Innovation and Academic Communication Foundation.
Citation: Dong Xin, Ye Jihong.Wind tunnel test for wind pressure characteristics on a saddle roof[J].Journal of Southeast University(English Edition), 2010, 26(3):436-443.

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