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Mode-like properties and identification of nonlinear vibrating systems

Huang, Liping (1995) Mode-like properties and identification of nonlinear vibrating systems. EERL Report, 95-04. California Institute of Technology , Pasadena, CA. (Unpublished)

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A study is made of mode-like properties and identification of nonlinear systems and their applications in structural seismic analysis. In the thesis, mode-like behavior of nonlinear systems is examined. The modal frequencies and mode shapes of nonlinear systems are found to be dependent on the response. Based on approximation, amplitude-dependent mode shape is defined and approximate methods for calculation of modal frequencies and mode shapes (instantaneous and amplitude-dependent) are presented. Based on amplitude-dependent modal relationship, amplitude-dependent models of modal equations which are valid in large range of response and suitable for unique identification are proposed and the corresponding modal identification procedures are developed. The applicability of the new models and identification algorithms is tested through the analysis of an ideal 3DOF nonlinear system. As applications, the seismic responses of a 47-story building and a 4-story building are investigated using the presented methods. The modal parameters and modal equations of the structures are identified.

Item Type:Report or Paper (Technical Report)
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URLURL TypeDescription ItemAlso published as author's PhD thesis
Additional Information:PhD, 1995
Group:Earthquake Engineering Research Laboratory
Series Name:EERL Report
Issue or Number:95-04
Record Number:CaltechEERL:1995.EERL-95-04
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Usage Policy:You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
ID Code:26399
Deposited By: Imported from CaltechEERL
Deposited On:15 Nov 2001
Last Modified:18 Aug 2021 00:07

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