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[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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Wind tunnel test for wind pressure characteristics on a saddle roof()
菱形马鞍屋盖表面风压特性的风洞试验研究
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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
菱形马鞍屋盖表面风压特性的风洞试验研究
Author(s):
Dong Xin Ye Jihong
Key Laboratory of Concrete and Pre-Stressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
董欣 叶继红
东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096
Keywords:
saddle roof mechanism of wind pressure distribution wind pressure spectra non-Gaussian feature
马鞍屋盖 风压分布机理 风压谱 非高斯特性
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.
通过刚性模型风洞测压试验, 研究了风向沿马鞍低点连线时菱形马鞍屋盖表面的风压特性.首先给出了屋盖表面的平均及脉动风压分布, 通过脉动风压谱, 从微观角度阐述了迎风前缘附近旋涡从生成、发展直到最后破裂的过程, 进而解释了迎风前缘易损区域的平均及脉动风压分布机理.分析马鞍高点附近的风压谱形状, 发现结构对于来流的干扰作用在风压脉动上体现为高频脉动.此后用测点风压时程的三、四阶矩对风压的非高斯特性进行描述并给出了划分高斯、非高斯区的标准, 在此基础上对马鞍屋盖表面进行了分区.通过研究脉动风压谱, 发现风压非高斯特性是由于来流的分离运动及结构对来流的干扰作用引起的, 且前者引起的非高斯特性较后者更为显著.

References:

[1] Chen Meifa. Characterization of wind pressure fluctuations on a gable roof house[D]. Clemson, SC, USA: Civil Engineering of Clemson University, 2000: 63-76.
[2] Kasperski M, Koss H, Sahlmen J. BEATRICE joint project: wind action on low-rise buildings, Part 1: basic information and first results[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1996, 64(2/3): 101-125.
[3] Suresh Kumar K, Stathopoulos T. Power spectra of wind pressure on low building roofs[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1998, 74/75/76: 665-674.
[4] Stathopoulos T. PDF of wind pressure on low-rise buildings[J]. Journal of Structural Engineering, 1980, 106(5): 973-990.
[5] Kareem A, Cermak J E. Pressure fluctuations on a square building model in boundary layer flows[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1984, 16(1): 17-24.
[6] Suresh Kumar K, Sathopoulos T. Wind loads on low building roofs: a stochastic perspective[J]. Journal of Structural Engineering, 2000, 126(8): 944-956.
[7] Sun Ying, Wu Yue, Shen Shizhao, et al. Non-Gaussian features of fluctuating wind pressures on long span roofs[J]. China Civil Engineering Journal, 2007, 40(4): 1-5.(in Chinese)
[8] Gioffre M, Gusella V. Non-Gaussian wind pressure on prismatic buildings.Ⅰ: stochastic field[J]. Journal of Structural Engineering, 2001, 127(9): 981-989.
[9] Ko Nag Ho, You Ki Pyo, Kim Young-Moon. The effect of non-Gaussian local wind pressures on a side face of a square building[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2005, 93(5): 383-397.
[10] Hou Xinzhen. Wind tunnel experimental research on rigid models of long span roof[D]. Nanjing: School of Civil Engineering of Southeast University, 2009: 38-61.(in Chinese)
[11] Shen Zhenyuan, Nie Zhiliang, Zhao Xuehe. Principles of communication system[M]. Xi’an: Xi’an Electronics Science and Technology University Press, 1993: 280-289.(in Chinese)
[12] Li Q S, Melbourne W H. An experimental investigation of the effects of free-stream turbulence on stream wise surface pressures in separated and reattaching flows[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1995, 54/55: 313-323.

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.
Last Update: 2010-09-20