Study on Wind Characteristics of Runyang Suspension Bridge Based on Long-Term Monitored Data

Abstract

The slender and°exible characteristics make Runyang Suspension Bridge (RSB) sensitive to the wind actions. In order to obtain reliable statistical wind characteristics and monitor the wind environment at the bridge site, two anemometers are included in the structural health monitoring system (SHMS) to collect extensive wind data. In this paper, the recorded real-time wind data are analyzed in detail to acquire the wind rose diagram, mean wind speed and direction, turbulence intensity, turbulence integral scale, and power spectral density (PSD). Three strong wind events including Typhoon Matsa, Typhoon Khanun and Northern wind are comparatively analyzed to show the inhomogeneous wind characteristics. And the measured wind characteristics are compared with the recommended values in current speci¯cation of China. The analytical results show that the wind speed and wind direction at RSB site are greatly in°uenced by the subtropical monsoon climate and typhoon climate. And the traditional known rules concerning turbulence intensity are not proper for strong winds, while the rules can be validated by long-term monitored data. Meanwhile, the recommended values of turbulence integral scale by current speci¯cation are suitable for long-term monitored wind, but the adaptability to strong wind is still defective. In addition, the measured along-wind spectra match generally well with the commonly used PSDs of turbulence. However, more researches are still needed to re¯ne current PSDs of turbulence to perfectly satisfy with the measured spectrum. The conclusions can provide references for the wind-resistant analysis of RSB and structures in similar areas.

Study on wind characteristics of a strong typhoon in near-ground boundary layer

“…Recently, with the gradual increase in economic activities in China, the measurement of wind characteristics used for tall buildings has been developed and some useful results have been obtained . In addition, a few field measurement researches have been performed on long‐span bridges, and it is important for wind engineering research. However, studies have yet thoroughly determined the wind characteristics in a strong typhoon wind field at present stage.…”

Wind characteristics at a long-span sea-crossing bridge site based on monitoring data

“…Finally, approximately 240,000 valid fitted curves of Simiu's spectrum are generated using 10-min wind speed and direction data at the bridge deck. The optimal parameter values in equation (7) are estimated based on the arithmetic mean of the fitted curves. The fitted curve of Simiu's spectrum is determined using the optimal parameters A 1 ¼ 6:3926 and B 1 ¼ 1:5559 for general winds at the Donghai Bridge, A 0 ¼ 200 and B 0 ¼ 50 for the Code, and A 2 ¼ 36:2564 and B 2 ¼ 10:5862 for strong wind based on data sets with 10-min mean wind speed higher than 20 m/s.…”

Buffeting response of a composite cable-stayed bridge in a trumpet-shaped mountain pass

“…The results showed that the cross-spectrum density has little effect on the buffeting response compared to the uncertainty of the wind field. Recently, there have been a great number of studies in the literature performed on the long-term monitoring wind field and analysed the influence of the terrain on the wind characteristics (Hu et al, 2013; Tao et al, 2016; Wang et al, 2016). Unfortunately, field measurements have mainly been focused on gorge terrains, mountainous terrains or fjords and have rarely been aimed at the mountain pass.…”