NEHRP Clearinghouse
- Title
- Estimating Soil Parameters Important for Lifeline Siting Using System Identification Techniques.
- File
- PB93178606.pdf
- Author(s)
- Glaser, S.
- Source
- March 1993, 102 p.
- Identifying Number(s)
- NISTIR-5143
- Abstract
- Liquefaction causes a large portion of all damage done by earthquakes. The damage is especially severe to lifeline structures such as pipelines. The report examines the state-of-the-art of the application of System Identification (SI) methods to the liquefaction problem, with special attention to lifelines. System identification is seen as the best way to ascertain large strain soil properties in situ. A thorough introduction to SI methods and spectral analysis is given. The traditional Fourier-based methods are found to be inexact since the sample variance is equal to the sample mean if averaging techniques are not used. There is an additional problem since earthquake signals are not stationary. Autoregressive-moving average models are seen as a better analysis method, especially the newer adaptive methods that are designed for non-stationary signals.
- Keywords
- Seismic waves; Railroads; Power lines; Mathematical models; Roads; Strain measurement; Earthquake engineering; System identification; Liquefaction; Soil dynamics; Pipelines; Earthquakes; Telecommunication