Abstract
This study carries out a detailed full-scale investigation on the strong wind characteristics at a cable-stayed bridge site and associated buffeting response of the bridge structure during construction, using a field monitoring system. It is found that the wind turbulence parameters during the typhoon and monsoon conditions share a considerable amount of similarity, and they can be described as the input turbulence parameters for the current wind-induced vibration theory. While the longitudinal turbulence integral scales are consistent with those in regional structural codes, the turbulence intensities and gust factors are less than the recommended values. The wind spectra obtained via the field measurements can be well approximated by the von Karman spectra. For the buffeting response of the bridge under strong winds, its vertical acceleration responses at the extreme single-cantilever state are significantly larger than those in the horizontal direction and the increasing tendencies with mean wind velocities are also different from each other. The identified frequencies of the bridge are utilized to validate its finite element model (FEM), and these field-measurement acceleration results are compared with those from the FEM-based numerical buffeting analysis with measured turbulence parameters.
Highlights
Strong wind gusts may cause a severe dynamic response of long-span bridges
The wind monitoring system (WMS) has become very popular and been treated as an essential part of the united wind and structural health monitoring system (WSHMS) in major and important bridges around the world to enhance structural safety and verify the current wind-induced vibration theory [7,8,9,10,11,12,13,14,15,16,17,18], most of the available studies concentrate on the wind characteristics and buffeting response of cable-supported bridges under the service stage
This study carried out a detailed full-scale investigation on the strong wind characteristics at a filed monitoring system
Summary
Strong wind gusts may cause a severe dynamic response of long-span bridges. The field measurement of wind characteristics plays an important role in accurately modeling wind effects on bridges. To obtain the full-scale databases of wind characteristics for a long-span bridge, a WMS is usually installed at the measurement tower near the bridge [1,2,3,4]. Compared to the wind-tunnel testing the aeroelastic few scale measurement for cable-stayed bridges under construction subjected to strong winds, especially of full-scale measurement for cable-stayed bridges under construction subjected to strong winds, for the extreme and single-cantilever states, are states, available. Correlation between vertical and horizontal accelerations of bridge horizontal accelerations of bridge girder and strong wind velocities is analyzed.
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