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標題: 不同斷面外形長跨度橋梁氣動力穩定性之風洞試驗研究
Wind Tunnel Investigation on the Aerodynamic Instability of Long-span Bridges with Different Cross-sectional Geometries
作者: 陳沛兆
Chen, Pei-Chao
關鍵字: 氣彈力行為;Aero-elastic Behavior;風洞試驗;斷面模型;顫振導數;Wind tunnel Test;Cross-section model;Flutter derivatives
出版社: 土木工程學系所
引用: 1.Bienkiewicz, B., “Wind-Tunnel Study of Effects of Geometry Modification On Aerodynamics of a Cable-Stayed Bridge Deck,” Journal of Wind Engineering. and Industrial Aerodynamics, Vol. 26, pp. 325-339, 1987. 2.Mathivat, J., “The Cantilever Construction of Prestressed oncrete Bridge,” A Wiley-Interscience Publication, 1983. 3.Tang, Man-Chung, “Guidelines for the Design of Cable-stayed Bridges,” American Society of Civil Engineers, 1992. 4.Scanlan, R. H. and Tomko, J. J. (1971), “Airfoil and bridge deck flutter derivatives,” Journal of Engineering, Mechanics Division, Vol. 97, pp. 1717-1737. 5.Scanlan, R.H. and Jones, N.P. (1990), “Aeroelastic analysis of cable-stayed bridges,” Journal of Structure Engineering, Vol. 116, No. 2, pp. 279-297. 6.Bienkiewicz, B. (1987), “Wind-tunnel study of effects of geometry modification on aerodynamics of a cable-stayed bridge deck,” Journal of Wind Engineering and Industrial Aerodynamics, Vol. 26, pp. 325-339. 7.Bienkiewicz, B., Cermak, J. E. and Peterka J. A. (1987), “Wind-tunnel study of aerodynamic stability and response of a cabled-stayed bridge deck,” Journal of Wind Engineering and Industrial Aerodynamics, Vol. 26, pp. 341-352. 8.Jain, A., Jones, N. P. and Scanlan R. H. (1998), “Effect of model damping on bridge aeroelasticity,” Journal of Wind Engineering and Industrial Aerodynamics, Vol. 77-78, pp. 421-430. 9.Matsumoto, M. Yoshizumi, F., Yabutani, T., Abe, K. and Nakajima, N. (1999), “Flutter stabilization and heaving-branch flutter,” Journal of Wind Engineering and Industrial Aerodynamics, Vol. 83, pp. 289-299. 10.Santo, H. and Branco, P. (1989), "wind force on bridges-numerical vs. experimental methods "Journal of Wind Engineering and Industrial Aerodynamics, Vol. 32, pp. 145-159. 11.Fang, F.M., Li, Y.C., Liang, T.C. and Chen, C.C. (2007), “Investigation on the aerodynamic instability of a suspension bridge with a hexagonal cross-section,” Journal of the Chinese Institite of Engineers, Vol. 30, No. 6, pp. 1009-1022. 12.Yasuharu Nakamura, Shigehira Ozono, “The Effects of Turbulence on a Separated and Reattaching Flow,” Journal of Fluid Mechanics, Vol. 178, pp. 477-490, 1987. 13.蔡同宏,“第二高速公路後續計畫燕巢九如段,高屏溪橋(主橋)風洞試驗報告”,研究報告書,中華民國交通部台灣區國道新建工程局,1994。 14.林世權,“風攻角和紊流場對長跨度橋樑抖振之影響”,淡江大學土木工程研究所碩士論文,1995。 15.藍倉連,“斷面寬深比對長跨度橋樑顫振與抖振之影響”,淡江大學土木工程研究所碩士論文,2001。 16.張鈞豪,“梯形斷面懸吊式橋樑受風效應之數值模擬與風洞試驗研究”,中興大學土木工程研究所碩士論文,2002。 17.黎益肇,“簡單幾何截面長跨度橋樑之氣彈力行為探討”,中興大學土木工程研究所博士論文,2005。 18.陳啟鈿,“偏心效應對懸吊式橋樑氣動不穩定性之影響”,中興大學土木工程研究所碩士論文,2010。 19.蔡宗雄,“質量偏心對長跨徑橋樑氣動穩定性影響之實驗研究”,中興大學土木工程研究所碩士論文,2011。 20.黃明慧,“曲線斜張橋樑之顫振與抖振研究”,淡江大學土木工程研究所博士論文,2012。
本實驗於內政部建築研究所風洞實驗室進行,針對長跨度橋梁之受風效應與相應之結構反應進行動力解析與探討。研究中以四種斷面形狀(矩形、梯形、六角形、ㄇ形)、5種寬深比(B/D = 5、8、10、12.5與15)並搭配5個垂直風攻角之情況進行橋體模型試驗,依據實驗所得橋體在垂直與扭轉兩個方向的時序列資料進行統計分析,並配合顫振導數探討平滑流場之變化對橋板動態反應的影響。
研究發現顫振發生之風速隨著橋體斷面形狀、寬深比與風攻角之改變而變化。當寬深比愈大,橋體斷面愈接近流線形,其氣動穩定性愈佳。比較四種幾何外形橋體後發現,當橋體為六角形時,臨界風速最高,氣動穩定性亦較佳。另一方面顫振導數 負轉正的時機(風速)與顫振臨界風速有相同的變化趨勢

Wind tunnel measurements are conducted in parallel to measure the response of a sectional bridge model. The vertical and torsional deflections of the model are measured under various wind speeds with several selected attack angles and given various breadth to depth ratios ranging from B/D = 5 to 15.
The parameters in the problem are geometric cross-section, attack angles, breadth to depth ratios. Results show that the aspect ratio greater the better its aerodynamic stability.and aerodynamic stability of Hexagonal-shaped is better.
其他識別: U0005-3107201313061700
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