A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental modal analysis of a cable-stayed bridge
The experimental modal analysis of the Indiano cable-stayed bridge has been carried out. Based on measured data a preliminary analysis in frequency domain has been performed, in order to determine auto and cross power spectral density functions. With MATLAB routines, Welch periodogram method has been used for this analysis. In order to minimize leakage a Hanning time window function has been used. Several peaks have been observed in the spectra. The final vertical and torsional mode shapes have been obtained by assembling the results obtained from three tests with different sensors locations; a reference location has been used. In the same way another test has been used to derive lateral mode shapes of the bridge deck. This choice was related to the very few number of instruments used on the bridge deck. The experimental frequencies and mode shapes have been derived by using a simple program on purpose developed and tested for MATLAB, based on Frequency Domain Decomposition method. The results have been compared with those obtained by means of a 3D finite element model, developed using SAP2000. Experimentally and analytical mode shapes have been object of comparison for by MAC modal indicator. Thus, six modes were correct identified. In spite of the few measurement locations used, a good agreement between numerical and experimental modes was obtained. This can be viewed as a further confirmation of the validity of FDD method in the identification of modal parameters of civil structures subjected to ambient vibrations and for output-only measures.
Experimental modal analysis of a cable-stayed bridge
The experimental modal analysis of the Indiano cable-stayed bridge has been carried out. Based on measured data a preliminary analysis in frequency domain has been performed, in order to determine auto and cross power spectral density functions. With MATLAB routines, Welch periodogram method has been used for this analysis. In order to minimize leakage a Hanning time window function has been used. Several peaks have been observed in the spectra. The final vertical and torsional mode shapes have been obtained by assembling the results obtained from three tests with different sensors locations; a reference location has been used. In the same way another test has been used to derive lateral mode shapes of the bridge deck. This choice was related to the very few number of instruments used on the bridge deck. The experimental frequencies and mode shapes have been derived by using a simple program on purpose developed and tested for MATLAB, based on Frequency Domain Decomposition method. The results have been compared with those obtained by means of a 3D finite element model, developed using SAP2000. Experimentally and analytical mode shapes have been object of comparison for by MAC modal indicator. Thus, six modes were correct identified. In spite of the few measurement locations used, a good agreement between numerical and experimental modes was obtained. This can be viewed as a further confirmation of the validity of FDD method in the identification of modal parameters of civil structures subjected to ambient vibrations and for output-only measures.
Experimental modal analysis of a cable-stayed bridge
Experimentelle Schwingungsanalyse einer Schrägseilbrücke
Clemente, P. (author) / Manuli, A. (author) / Saitta, F. (author)
2006
10 Seiten, 13 Bilder, 3 Tabellen, 10 Quellen
Conference paper
Storage medium
English
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