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Modeling and identification in structural dynamics

Jayakumar, Paramsothy (1987) Modeling and identification in structural dynamics. EERL Report, 87-01. California Institute of Technology , Pasadena, CA. (Unpublished)

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Analytical modeling of structures subjected to ground motions is an important aspect of fully dynamic earthquake-resistant design. In general, linear models are only sufficient to represent structural responses resulting from earthquake motions of small amplitudes. However, the response of structures during strong ground motions is highly nonlinear and hysteretic. System identification is an effective tool for developing analytical models from experimental data. Testing of full-scale prototype structures remains the most realistic and reliable source of inelastic seismic response data. Pseudo-dynamic testing is a recently developed quasi-static procedure for subjecting full-scale structures to simulated earthquake response. The present study deals with structural modeling and the determination of optimal linear and nonlinear models by applying system identification techniques to elastic and inelastic pseudo-dynamic data from a full-scale, six-story steel structure. It is shown that the feedback of experimental errors during the pseudo-dynamic tests significantly affected the higher modes and led to an effective negative damping for the third mode. The contributions of these errors are accounted for and the small-amplitude modal properties of the test structure are determined. These properties are in agreement with the values obtained from a shaking table test of a 0.3 scale model. The nonlinear hysteretic behavior of the structure during strong ground motions is represented by a general class of Masing models. A simple model belonging to this class is chosen with parameters which can be estimated theoretically, thereby making this type of model potentially useful during the design stages. The above model is identified from the experimental data and then its prediction capability and application in seismic design and analysis are examined.

Item Type:Report or Paper (Technical Report)
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URLURL TypeDescription ItemAlso published as author's PhD thesis
Additional Information:PhD, 1987: PB-89-194146/AS
Group:Earthquake Engineering Research Laboratory
Series Name:EERL Report
Issue or Number:87-01
Record Number:CaltechEERL:1987.EERL-87-01
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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:26380
Deposited By: Imported from CaltechEERL
Deposited On:12 Oct 2001
Last Modified:19 Aug 2021 23:55

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