本文係以風洞實驗方法研究矩斷面高層建 築在大氣邊界層所受之風力特性。風洞實驗以 高層建築之高寬比,斷面長寬比及大氣邊界層 為控制參數,分別探討其對建築物表面所受風 力係數以及風力頻譜特性的影響。研究結果顯 示流場在建築物前緣分離之自由剪力層是否發 生再接觸現象及其完整性是影響矩斷面高層建 築所受風力的主要原因。斷面長寬比由於主導 再接觸現象,故對風力特性的影響最大,建築物 高寬比以及邊界層特性則因改變流場的紊流特 性,所以對風力特性亦有不容忽視的影響。
A wind tunnel experimental study was conducted to investigates aerodynamics characteristics of high-rise buildings with rectangular cross-section in natural atmospheric boundary layers. The depth-to- width, height-to- width ratio of building and boundary layer characteristics were chose to be the control parameters in the wind tunnel experiment. The major objectives of this study are to investigate the effects of these parameters on the wind force coefficients and wind force spectral characteristics. The results show the most important factors of wind force on the high-rise building is the occurrence of reattachment of the separated free shear layers. The depth-to-width ratio of building dominants the reattachment phenomenon, so it has the greatest influence on wind force characteristics. The height-to-width ratio and natures of boundary layer have some effects on the characteristics of turbulence, therefore, may cast significant influence on wind force. A wind tunnel experimental study was conducted to investigates aerodynamics characteristics of high-rise buildings with rectangular cross-section in natural atmospheric boundary layers. The depth-to- width, height-to- width ratio of building and boundary layer characteristics were chose to be the control parameters in the wind tunnel experiment. The major objectives of this study are to investigate the effects of these parameters on the wind force coefficients and wind force spectral characteristics. The results show the most important factors of wind force on the high-rise building is the occurrence of reattachment of the separated free shear layers. The depth-to-width ratio of building dominants the reattachment phenomenon, so it has the greatest influence on wind force characteristics. The height-to-width ratio and natures of boundary layer have some effects on the characteristics of turbulence, therefore, may cast significant influence on wind force.
Relation:
中華民國力學學會第十七屆全國力學會議論文集(上)=Proceedings of the 17th National Conference on Theoretical and Applied Mechanics(I)，頁415-422
