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Wind and Structures Volume 25, Number 2, August 2017 , pages 195-214 DOI: https://doi.org/10.12989/was.2017.25.2.195 |
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Wind characteristics at Sutong Bridge site using 8-year field measurement data |
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Xu Zidong, Wang Hao, Wu Teng, Tao Tianyou and Mao Jianxiao
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| Abstract | ||
| Full-scale wind characteristics based on the field measurements is an essential element in structural wind engineering. Statistical analysis of the wind characteristics at Sutong Cable-stayed Bridge (SCB) site is conducted in this study with the recorded long-term wind data from structural health monitoring system (SHMS) between 2008 and 2015. Both the mean and turbulent wind characteristics and power spectra are comprehensively investigated and compared with those in the current codes of practice, such as the measured wind rose diagram, monthly maximum mean wind speed, turbulence intensity, integral length scale. Measurement results based on the monitoring data show that winds surrounding the SCB site are substantially influenced by the southeast monsoon in summer and strong northern wind in winter. The measured turbulence intensity is slightly higher than the recommended values in specifications, while the measured ratio of lateral to longitudinal turbulence intensity is slightly lower. An approximately linear relationship between the measured turbulence intensities and gust factors is obtained. The mean value of the turbulence integral length scale is smaller than that of typical typhoon events. In addition, it is found that the Kaimal spectrum is suitable to be adopted as the power spectrum for longitudinal wind component at the SCB site. This contribution would provide important wind characteristic references for the wind performance evaluation of SCB and other civil infrastructures in adjacent regions. | ||
| Key Words | ||
| wind characteristics; turbulence; long-term monitoring; Sutong Bridge; structural health monitoring system | ||
| Address | ||
| Xu Zidong, Wang Hao, Tao Tianyou and Mao Jianxiao: Key Laboratory of Concrete and Prestressed Concrete Structure of the Ministry of Education, Southeast University, Nanjing 210096, China Wu Teng: Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA | ||