Abstract
Buffeting performance is growing sensitive to external and internal factors with increasing span of bridge. Aerodynamic admittance is an essential parameter in analyzing buffeting performance. In this paper, aerodynamic admittance in different conditions were conducted in wind tunnel tests by section model. Three kinds of aerodynamic admittance functions were used to calculating buffeting performance respectively. It is found that the aerodynamic admittance of streamlined deck is closely related to wind attack angle, and has a small difference at different wind speeds. However, the influence of aerodynamic admittance on buffeting performance is affected by the wind speed significantly. Under given conditions, adopting the Sears function as the admittance function of a similar streamlined box girder is reasonable, while the buffeting performance result obtained by adopting an admittance function as 1.0 is very conservative.
Highlights
Buffeting performance is a forced vibration caused by turbulence wind
Draft admittance increased obviously with the increasing of wind attack angle, and the trend of change was evident
Lift and moment admittance decreased with the increasing of wind attack angle, and the trend of change was slighter than draft admittance
Summary
Buffeting performance is a forced vibration caused by turbulence wind. This vibration can interfere many features of bridge, such as fatigue damage, discomfort for vehicles and pedestrians. Researchers have been working in external factors influence on buffeting performance, including topography [1], extreme value of typhoon [2], turbulence characteristics [3], turbulent spatial correlation coefficient [4], skew wind [5,6,7], design and measured power spectrum [8], non-stationary and stochastic excitation [2, 9,10,11]. M. [29] estimated the aerodynamic admittance of bridge sections by mesh-free vortex method and confirmed its feasibility by comparing to available wind tunnel data. [30] proposed a new identification algorithm about the admittance function and validated it by a comparison between the numerical calculation and wind tunnel tests. Three type aerodynamic admittance functions were used to calculate buffeting performance respectively in time domain, which accounted for structural nonlinearities. The analytical results are expected to provide references for the buffeting performance analysis, fatigue damage and comfort of wind-vehicle-bridge system analysis
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