System identification on LSST 1/4 scale soil-structure interaction model

The importance of system identification in earthquake engineering has increased in recent years, primarily motivated by the desire to have a more accurate description of the structural dynamic characteristics. A 3-D array to measure soil-structure interaction has been constructed. This LSST 1/4 scale model was located in Lotung, Taiwan. Up to now, many good earthquake data had been recorded by this LSST array which provide data to study the soil-structure interaction. Dynamic soil-structure interaction have been studied by many authors from theoretical points of view. The objective of this paper is to present the basis of system identification on the LSST array data. By taking advantage of the parametric identification, the sequential regression algorithm is used to identify the dynamic characteristics of the soil deposit. The overturning moment and the base shear force of the soil-structure system during earthquake are analyzed. Some dynamic properties of the structure and the soil are estimated