Joint Time-frequency Analysis of Approach wind Velocity and Pressure on Bridge Pylons

Abstract eng:
Application of proper orthogonal decomposition (POD) and continuous wavelet transform (CWT) is introduced to study wind velocity and pressures acting on the bridge pylons. In this paper, a detailed analysis of the approach wind flow, wind-induced pylon pressure and the relation between the two fields is carried out using the POD technique and the CWT analysis. Spatio-temporal characteristics of the wind loading are investigated using the POD technique. The relationship between the approach wind and windinduced peak pressure events on the surfaces of pylons is studied using the CWT analysis. The preliminary study shows that extreme peak pressure in the separated shear layer is due to condensed large eddy motions and entrainment of small scale eddies. The result also shows potential of the joint application of the POD and CWT methods in characterization of non-stationary events of wind velocity and wind-induced pressure.

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