The effect of surface roughness elements on the atmospheric boundary layer
| Autor: | Tsung-Pu Hu, 胡琮普 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 It is well known that the characteristics of the nature wind, the wind pressure (force) coefficients and the gust response factors are the three most important factors in the building wind code. Among the three items, the nature wind field exerts probably the most significant impact on the design wind load, and at the same time, is the most localized wind load parameter. Field measurement is the direct approach to study the characteristics of atmospheric boundary layers. It is also the most expensive and difficult way to do it. Wind tunnel simulation provides an easier alternative for this purpose. However, wind tunnel results need careful validation. This research project performed an in-depth investigation on the characteristics of nature wind. Based on the in-situ measurements at three different monitoring sites that represent urban, suburban and open terrain categories, three turbulent boundary layers were simulated in wind tunnel. The floor roughness elements used in these simulations were signed based on the actual building developments at the three monitoring sites. The wind profiles of the wind tunnel simulations agree well with the field data and the wind tunnel results of the “replica terrain models”. Wind tunnel study further indicates that the influence of upstream surface roughness on the development of turbulent boundary layer in a medium length test section wind tunnel is proportional to the upstream distance. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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