Non-linear Damping and Frequency Identification in a Progressively Damaged R.C. Element |
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Authors: | G V Demarie D Sabia |
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Institution: | (1) Dip. Ingegneria Strutturale e Geotecnica, Politecnico di Torino, c. Duca degli Abruzzi 24, 10129 Torino, Italy |
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Abstract: | This paper describes the non-linear identification of a progressively damaged reinforced concrete beam-column node. The aims
are the detection and identification of the different sources of damping and their dependence from the damage level. To this
end a specially formulated non-linear identification method is proposed, based on a time-varying polynomial approximation
of the system dynamics, suitable for use in the presence of excitations of any form. A minimum condition imposed to the identified
dissipated energy leads to the distinction of the linear viscous component from the other damping mechanisms. The estimated
values obtained from the experimental tests show a significant influence of the damage level on the linear viscous damping
coefficient. This suggests that, in a non-linear dynamic time-history analysis, the use of Rayleigh damping model with proportionality
to the initial stiffness is basically in contrast with experimental evidence and more refined viscous damping models are needed
for prediction purposes. |
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Keywords: | |
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