Abstract
Field measurement of strong wind characteristics is of great significance for the development of bridge wind engineering. Located in east China, the Runyang Suspension Bridge (RSB) with a main span of 1490 m is the longest bridge in China and the third longest in the world. During the last four years, the RSB has suffered from typhoons and strong northern winds on more than ten occasions. To determine the strong wind characteristics of the RSB, wind measurement data obtained from field tests during strong winds and data from the wind environment monitoring subsystem of the structural health monitoring system (SHMS) of the RSB were combined to analyze the wind speed and direction, variation in wind speed with height, turbulence intensity, turbulence integral length, wind friction speed and the power spectrum. Comparative studies on the characteristics of these different strong winds were carried out based on the current wind-resistant design specification for highway bridges. Results showed that some regularity in wind characteristics can be found in these different typhoons passing through the RSB. The difference between a strong northern wind and a typhoon is relatively clear, and in summer the typhoon is the dominant wind load acting on the RSB. In addition, there were some differences between the measured strong wind characteristics and the values suggested by the specification, especially in respect to turbulence intensity and turbulence integral length. Results provide measurement data for establishing a strong wind characteristic database for the RSB and for determining the strong wind characteristic parameter values of this coastal area in east China.
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Project supported by the National Natural Science Foundation of China (Nos. 50725828, 50908046, and 50978056), the National Science & Technology Pillar Program (No. 2006BAJ03B05), and the PhD Program Foundation of MOE (No. 200802861012), China
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Wang, H., Li, Aq., Jiao, Ck. et al. Characteristics of strong winds at the Runyang Suspension Bridge based on field tests from 2005 to 2008. J. Zhejiang Univ. Sci. A 11, 465–476 (2010). https://doi.org/10.1631/jzus.A0900601
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DOI: https://doi.org/10.1631/jzus.A0900601