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Wind and Structures Volume 4, Number 5, October 2001 , pages 413-440 DOI: https://doi.org/10.12989/was.2001.4.5.413 |
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Unsteady wind loading on a wall |
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C.J. Baker(U.K.)rn
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| Abstract | ||
| This paper presents an extensive analysis of unsteady wind loading data on a 18 m long andrn2 m high wall in a rural environment, with the wind at a range of angles to the wall normal. The data isrnfirstly analyzed using standard statistical techniques (moments of probability distributions, auto- and cross-correlations,rnauto- and cross-spectra etc.). The analysis is taken further using a variety of less conventionalrnmethods - conditional sampling, proper orthogonal decomposition and wavelet analysis. It is shown that,rneven though the geometry is simple, the nature of the unsteady flow is surprisingly complex. The fluctuatingrnpressures on the front face of the wall are to a great extent caused by the turbulent fluctuations in thernupstream flow, and reflect the oncoming flow structures. The results further suggest that there are distinctrnstructures in the oncoming flow with a variety of scales, and that the second order quasi-steady approachrncan predict the pressure fluctuations quite well. The fluctuating pressures on the rear face are alsorninfluenced by the fluctuations in the oncoming turbulence, but also by unsteady fluctuations due to wakernunsteadiness. These fluctuations have a greater temporal and spatial coherence than on the front face andrnthe quasi-steady method over-predicts the extent of these fluctuations. Finally the results are used to checkrnsome assumptions made in the current UK wind loading code of practice. | ||
| Key Words | ||
| unsteady loading; correlations; proper orthogonal decomposition; wavelet analysis; conditional sampling; wall. | ||
| Address | ||
| C. J. Baker, School of Civil Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K. | ||