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| Experimental Study of a Wind Field in a Long-span Bridge Site Located in Mountainous Valley Terrain |
| XU Hong-tao1, HE Yong1, LIAO Hai-li2, MA Cun-ming2, XIAN Rong3 |
1. Beijing Jiaoke Highway Survey, Design and Research Institute, Beijing 100088, China;
2. Southwest Jiaotong University, Chengdu Sichuan 610031, China;
3. Guangdong Road Construction Limited Company, Guangzhou Guangdong 510600, China |
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Abstract The Baling River Bridge is a long-span bridge located in a special mountainous area. The site has a very complicated wind field that is representative of many cases in west China. A terrain model that simulates the practical status of the wind field in the bridge site was tested in a wind tunnel to confirm the design of basic wind speed. Other characteristic wind parameters were also determined to provide a reference for similar bridge designation in the future. The test method was researched to identify its correctness and reliability, and the Von Karman pulse wind speed PSD was used. The wind speed evidently increased at the height of the middle span girder because of the effect of narrowing. Furthermore, the wind profile distribution was not uniform. The average attack angle range was -4.7° to+4.7°, obviously larger than the Wind resistant design specifications of highway bridges required (±3°). The Power spectral density function(PSD) of lateral and vertical wind speed was close to that listed in the criteria at the high-frequency part of the bridge; no clear differences at the low-frequency part were observed.
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Received: 14 March 2012
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| Fund:Supported by the National Natural Science Foundation of China(No.50808148) |
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Corresponding Authors:
XU Hong-tao, xht1978@163.com
E-mail: xht1978@163.com
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2013, Vol. 7 
