Modeling and identification in structural dynamics
- Creators
- Jayakumar, Paramsothy
Abstract
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.
Additional Information
PhD, 1987: PB-89-194146/ASAttached Files
Accepted Version - 8701.pdf
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Additional details
- Eprint ID
- 26380
- Resolver ID
- CaltechEERL:1987.EERL-87-01
- Created
-
2001-10-12Created from EPrint's datestamp field
- Updated
-
2021-08-19Created from EPrint's last_modified field
- Caltech groups
- Earthquake Engineering Research Laboratory
- Series Name
- EERL Report
- Series Volume or Issue Number
- 87-01