Measurement of Non-Stationary Characteristics of a Landfall Typhoon at the Jiangyin Bridge Site

作者：He, Xuhui; Qin, Hongxi; Tao, Tianyou^*; Liu, Wenshuo^*; Wang, Hao

来源：Sensors (Switzerland), 2017, 17(10): 2186.

DOI：10.3390/s17102186

• wind characteristics
• tropical storm
• non-stationarity
• field measurement
• long-span suspension bridge

The wind-sensitive long-span suspension bridge is a vital element in land transportation. Understanding the wind characteristics at the bridge site is thus of great significance to the wind- resistant analysis of such a flexible structure. In this study, a strong wind event from a landfall typhoon called Soudelor recorded at the Jiangyin Bridge site with the anemometer is taken as the research object. As inherent time-varying trends are frequently captured in typhoon events, the wind characteristics of Soudelor are analyzed in a non-stationary perspective. The time-varying mean is first extracted with the wavelet-based self-adaptive method. Then, the non-stationary turbulent wind characteristics, e.g.; turbulence intensity, gust factor, turbulence integral scale, and power spectral density, are investigated and compared with the results from the stationary analysis. The comparison highlights the importance of non-stationary considerations of typhoon events, and a transition from stationarity to non-stationarity for the analysis of wind effects. The analytical results could help enrich the database of non-stationary wind characteristics, and are expected to provide references for the wind-resistant analysis of engineering structures in similar areas.

• 出版日期2017-10
• 单位东南大学