本研究以風洞實驗的方式探討在穩態風場及陣風風場中三維圓柱體及矩柱體建築物模型表面壓力之分佈情形。實驗條件包括無陣風以及三種不同頻率的週期性陣風風場，實驗中使用電子式壓力掃描器，可同時量測多個位置的瞬時壓力。由實驗結果可計算得建築物表面的平均、擾動壓力分佈與機率密度函數，風壓頻譜分析方法採用傅立葉頻譜分析及希爾伯特-黃分析兩種方法。研究結果顯示：陣風風場之平均壓力係數分佈趨勢與穩態風場、邊界層流十分接近，數值則介在兩者之間，可將陣風視為一種過渡流；圓柱體的最大擾動壓力發生在最大負壓發生處，陣風來流造成圓柱體在迎風面及分離區的擾動壓力增大；由傅立葉頻譜分析及希爾伯特-黃分析之風壓頻譜結果顯示圓柱體渦流逸散頻率為13 Hz，史徹荷數為0.22；窄迎風面矩柱體渦流逸散頻率為10 Hz，史徹荷數為0.082，較邊界層流與陣風風場中的史徹荷數為小。當陣風頻率增大時，史徹荷數增大，顯示渦流逸散頻率增加。本研究之結果可幫助吾人瞭解對穩態風場與陣風風場中三維圓柱體及矩柱體對流況與壓力分佈的影響，可供相關工程設計之參考。

This study experimentally investigates the pressure distribution on the surface of three-dimensional building model in an uniform flow and periodically varying flows. The experiments were carried out in an atmospheric boundary layer wind tunnel. This wind tunnel is equipped with a gust generator that can generate periodically varying flows of adjustable frequency. Flow condition includes one rectangular cylinder and one circular cylinder of smooth surface. Instantaneous fluctuating wind pressures were measured by an electronic pressure scanner. Based on the pressure measurement, the distributions of mean, rms pressure coefficients were calculated. Furthermore, Hilbert-Huang Transform (HHT) was used for the time-frequency domain analysis. The experimental results also revealed that the rms pressure coefficient increase under gusty wind. Also, the probability of pressure fluctuations for positive pressure are close to the Gaussian distribution function. On the other hand, negative pressure side was skewed and did not necessary follow Gaussian distribution.

1. 熊萬銀 (1996) “結構震動與流場互制現象之風洞實驗研究”, 國立成功大學土木工程研究所碩士論文
2. 蔡益超、陳瑞華、項維邦 (1996) “建築物風力規範條文、解說及示範例之研訂”, 內政部建築研究所研究報告
3. 莊威男 (2000) “超高層建築在紊流邊界層中表面風壓分佈之風洞試驗研究”, 國立海洋大學河海工程研究所碩士論文
4. 卓勇志 (2001) “邊界層中雙棟並排矩形建築之表面風壓量測”, 國立中央大學土木工程研究所碩士論文
5. 中華民國內政部營建署 (2002) “建築技術規則(91年1月修正版)”, 內政部營建署法規
6. 李肇軒 (2002) “圓柱體形建築物表面風壓之實驗研究”, 國立中央大學土木工程研究所碩士論文
7. 陳若華、蔡明樹、傅仲麟 (2003) “大氣邊界層流場中矩柱體尖峰風壓特性研究”, 中華民國第二十七屆全國力學會議, 台南
8. 李有豐、黃皓君、張順益、黃鋼 (2004) “非韌性雙層跨含牆RC架構之擬動態試驗與結構反應之HHT分析”, 建築學報, 第47期,pp.53-75
9. Bearman, P.W. (1969) “On vortex shedding from a circular cylinder in the critical Reynolds number regime”, Journal of Fluid Mechanics, Vol.37, pp.577-585
10. Bendat, J.S. and Piersol, A.G. (1986) Random Data-Analysis and Measurement Procedures, 2nd edition
11. Cheung, J.C.K. and Melbourne, W.H. (1983) “Turbulence effects on some aerodynamic parameters of a circular cylinder at supercritical Reynolds numbers”, Journal Wind Engineering and Industrual Aerodynamics, Vol.14, pp.399-410
12. Cochran, L.S. and Cermak, J.E. (1992) “Full- and model-scale cladding pressure on the Texas Tech University experimental building”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.41-44, pp.1589-1600
13. Hu, C.C., Miau, J.J. and Chou, J.H. (2002) “Instantaneous vortex-shedding behavior in periodically varying flow”, Proceedings of Royal Society of London, Series A 458, pp.911-932
14. Huang, N.E., Shen, Z., Long, S.R., Wu, M.C., Shin, H.H., Zheng, Q., Yen, N.C., Tung, C.C. and Liu, H.H. (1998) “The empirical mode decomposition and the Hilbert spectrum for nonlinear and nonstationary time series analysis”, Proceedings of Royal Society of London, Series A 454, pp.903-995
15. Huang, N.E., Shen, Z. and Long, S.R. (1999) “A new view of nonlinear water wave：the Hilbert spectrum”, Annu. Rev. Fluid Mech., Vol. 31, pp.417-457
16. Huang, N.E., Wu, M.C., Shen, S.S.P., Qu, W., Gloersen, P. and Fan, K.L. (2003) “A confidence limit for the empirical mode decomposition and Hilbert spectral analysis”, Proceedings of Royal Society of London, Series A 459, pp.2317-2345
17. Kareem, A. and Cermak, J.E. (1984) “Pressure fluctuations on a square building model in boundary-layer flows”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.16, pp.17-41
18. Kobayashi, H., Hatanaka, A. and Ueda, T. (1994) “Active simulation of time histories of strong wind gust in a wind tunnel”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.53, pp.315-330
19. Kiya, M., Sasaki, K. and Arie, M. (1981) “Discrete-vortex simulation of a turbulent separation bubble”, Journal of Fluid Mechanics, Vol.120, pp.219-244
20. Lee B.E. (1975) ”The effect of turbulence on the surface pressure field of a square prism”, J. of Fluid Mech., Vol.69, pp.263-282
21. Letchford, C.W., Iverson, R.E. and McDonald, J.R. (1993) “The application of the quasi-steady theory to full scale measurements on Texas Tech Building”, J. of Wind Eng. and Industrial Aerodyn., Vol.48, pp.111-132
22. Luo, S.C., Gan, T.L., and Chew, Y.T. (1996) “Uniform flow past one (or two in tandem) finite length circular cylinder(s)”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.59, pp.69-93
23. Nakamura, Y. and Tomonari, Y. (1982) “The effects of surface roughness on the flow past circular cylinders at high Reynolds numbers”, J. Fluid Mech., Vol.123, pp.363-378
24. Naudascher, E. (1991) “Hydrodynamic Forces”, A.A. Balkema
25. Nishimura, H. and Taniike, Y. (2001) “Aerodynamic characteristics of fluactuating forces on a circular cylinder”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.89, pp.713-723
26. Okajima A. (1982) “Strouhal numbers of rectangular cylinders”, J. of Fluid Mech., Vol.123, pp.379-398
27. Okamoto, S. and Sunabashiri, Y. (1992) “Vortex shedding from a circular cylinder of finite length placed on a flat plate”, Journal of Fluid Mechanics, Vol.114, pp.512-537
28. Parkinson, G.V. (1974) “Mathematical models of flow-induced vibrations of bluff bodies”, Flow-induced structural vibrations, E. Naudascher(ed). Springer, pp.81
29. Peterka, J.A. and Cermak, J.E. (1975) “Wind pressure on buildings-probability densities”, Journal of the Structural Division, ASCE Vol.101, pp.1255-1267
30. Rae, W.H.J., Barlow, J.B. and Pope, A. (1999) “Low-Speed Wind Tunnel testing”, Johns Wiley & Sons, Inc.
31. Roshko, A. (1960) “Experiments on the flow past a circular cylinder at very high Reynolds number”, Journal of Fluid Mechanics, Vol.10, pp.345-356
32. Sitheeq, M., Iyengar, A. and Farell, C. (1997) “Effect of turbulence and its scales on the pressure field on the surface of a three-dimensional square prism”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.69-71, pp.461-471
33. Suzuki, M., Kondo, K., Sanada, S. and Minamide, K. (1993) “Prediction of the wind induced response of multi-story building-using simultaneous multi-channel measuring control system”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.50, pp.341-350
34. Uematsu, Y. and Yamada, M. (1995) “Effects of aspect ratio and surface roughness on th time-averaged aerodynamic forces on cantilevered circular cylinders at high Reynolds number”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.54-55, pp.301-312
35. Uematsu, Y. and Isyumov, N. (1999) “Wind pressure acting on low-rise buildings”, Journal of Wind Engineering and Industrial Aerodynamics, Vol.82, pp.1-25