关键词: 低矮房屋, 风洞试验, 风压系数, TTU 模型, 湍流度

Abstract:

In order to find the best simulated wind field and model scale matched with the size of the wind-tunnel test section for the wind tunnel test of low-rise buildings,wind tunnel tests in such three scales as 1: 15,1: 30 and 1:45 were carried out,with the internationally-general TTU ( Texas Tech University) building model as the research objective. Then,the effects of model size on the mean and the fluctuating wind pressure coefficients as well as on the blockage characteristics were analyzed. Moreover,the 1: 30 building model was tested in three simulated wind fields of exposure category B with different turbulence intensities,and the results were compared with those of other wind tunnel tests and field measurements with the full-scale TTU model. It is shown that the blockage effect can not be neglected even if the blockage is 4.9% for the building model in a 1: 15 scale,and that,as the simulated turbulence intensities in the simulated wind fields Ⅱ and Ⅲ approach the measured ones,the wind pressure coefficients of the TTU model tested in the simulated wind fields accord well with those obtained by full-scale field measurement. Based on the above-mentioned statements,a flow field is finally proposed for the wind tunnel test of low-rise buildings.

Key words: low-rise building, wind tunnel test, wind pressure coefficient, TTU model, turbulence intensity