Dynamic Parameter Identification for Irregular Buildings considering Soil-Structure Interaction Effects

Abstract

The employment of system identification (SID) techniques to evaluate building dynamic parameters based on vibration measurements is a crucial topic and has been used for structural health monitoring and damage assessment after extreme events such as earthquakes. This study presents an input/output (I/O) selection concept to extract the dynamic parameters of an irregular building superstructure considering both torsional coupling (TC) and soil–structure interaction (SSI) effects. This concept was validated by implementing an SID technique, named System Realization using Information Matrix (SRIM), based on the numerically simulated floor and foundation responses. This approach was also applied to assess the change of dynamic properties of the superstructure of two instrumented buildings using measurements recorded before and after the 1999 Chi-Chi, Taiwan earthquake. It is shown that the decrease in value of the modal frequencies will be overestimated if the SSI effects are neglected.