Research Scientist. Formerly Graduate Student, Civil Engineering Department, California Institute of Technology.
Structural identification using linear models and earthquake records
Article first published online: 8 JAN 2007
Copyright © 1980 John Wiley & Sons, Ltd
Earthquake Engineering & Structural Dynamics
Volume 8, Issue 2, pages 145–160, 1980
How to Cite
Beck, J. L. and Jennings, P. C. (1980), Structural identification using linear models and earthquake records. Earthquake Engng. Struct. Dyn., 8: 145–160. doi: 10.1002/eqe.4290080205
- Issue published online: 8 JAN 2007
- Article first published online: 8 JAN 2007
- Manuscript Revised: 3 OCT 1979
- Manuscript Received: 24 MAY 1979
- National Research Advisory Council of New Zealand
The problem of determining linear models of structures from seismic response data is investigated using ideas from the theory of system identification. The approach is to determine the optimal estimates of the model parameters by minimizing a selected measure-of-fit between the responses of the structure and the model. Because earthquake records are normally available from only a small number of locations in a structure, and because of noise in the records, it is necessary in practice to estimate parameters of the dominant modes in the records, rather than the stiffness and damping matrices of the linear model. A new algorithm is developed to determine the optimal estimates of the modal parameters. After tests with simulated data, the method is applied to a multi-storey building using records from the 1971 San Fernando earthquake in California. New information is obtained concerning the properties of the lower modes of the building and the time-varying character of the equivalent linear parameters.