In this paper reduced models are considered for the case of structures under wind-induced loads. The analysis considers in particular a slender structure under wind excitation. The experimental wind field on the sample building, reduced to resulting forces and couples acting on the structure, was measured in the CRIACIV(University of Florence) boundary-layer wind tunnel laboratory for several angle of attack of the wind. It is shown that coupling classical structural modal projection with so called blowing modes projection, obtained by decomposing the correlation wind or the power spectral density wind tensors, can lead to an efficient reduced model to represent structural response. In particular, the elaboration of experimental data has shown that the first few blowing modes can effectively represent the wind-field when eigenvectors of the psd tensor are used, while a significantly larger number of blowing modes is required when the correlation wind tensor is used to decompose the wind field.
Reduced models for wind-induced loads and structural response: wind-tunnel experimental tests
VASTA, Marcello;SEPE, VINCENZO
2011-01-01
Abstract
In this paper reduced models are considered for the case of structures under wind-induced loads. The analysis considers in particular a slender structure under wind excitation. The experimental wind field on the sample building, reduced to resulting forces and couples acting on the structure, was measured in the CRIACIV(University of Florence) boundary-layer wind tunnel laboratory for several angle of attack of the wind. It is shown that coupling classical structural modal projection with so called blowing modes projection, obtained by decomposing the correlation wind or the power spectral density wind tensors, can lead to an efficient reduced model to represent structural response. In particular, the elaboration of experimental data has shown that the first few blowing modes can effectively represent the wind-field when eigenvectors of the psd tensor are used, while a significantly larger number of blowing modes is required when the correlation wind tensor is used to decompose the wind field.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.