Representation of the wind action on structures by Proper Orthogonal Decomposition

摘要

The wind acting on the nodal points of a discretized structure is usually modeled as a Gaussian, stationery random vector whose components are correlated with each other according to characteristic patterns. Numerous techniques usually applied in structural dynamics require having the input constituted by a vector of independent random processes or even white noises. The application of such techniques in the wind-engineering context requires the introduction of suitable pre-filters to reproduce the exact correlation and harmonic content of the wind excitation. The present paper describes the development and the implementation of digital filters based on the Proper Orthogonal Decomposition of the wind turbulence. Two different approximated approaches are discussed and verified through numerical examples.