Relationship between surface roughness and turbulence of natural winds near the ground surface

Ryoji Sasaki,

Akinori Akahoshi,

Yasushi Uematsu

Abstrakt

The design of low-rise buildings such that they can handle wind loads makes it necessary to accurately evaluate those wind loads, both on the structural framework and on the cladding/components. To this end, it is necessary to fully understand the characteristics of the wind near the ground around a building. This study sets out to develop a quantitative means of estimating the turbulence of the wind near the surface of the ground, based on field measurements obtained at different points across Japan. The surface roughness is evaluated based on several factors taken from a building information database. The relationship between these factors and the turbulence of the wind is discussed. The effect of the observation height, relative to the surface of the ground, on the turbulence is also investigated.

Słowa kluczowe: gust factor, surface roughness, building information database, field measurement, observation height
References

[1] A kahoshi A., Sasaki R., Miyashita K., Nakamura O., Uematsu Y., Comparison of characteristics of terrain roughness and ground surface wind - Part 1 Parameters related to the terrain, Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan, 2012, 119-120 (in Japanese).

[2] A rchitectural Institute of Japan, Recommendations for Loads on Buildings, 2004 (in Japanese).

[3] N akamura O., Miyashita K., Uematsu Y., Yamada M., Actual conditions of terrain roughness evaluated from numerical data of structural dimensions in Tokyo, Journal of Wind Engineering, JAWE . No. 84, 2000, 59-69 (in Japanese).

[4] Sasaki R., Akahoshi A., Miyashita K., Nakamura O., Uematsu Y., Comparison of characteristics of terrain roughness and ground surface wind - Part 2 Effects on the characteristics of fluctuating wind speeds, Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan, 2012, 120-121 (in Japanese).