Identification of Hysteretic Behavior for Existing Structures

摘要

Two methods of system identification were developed for the estimation of structural behavior during earthquakes. Because earthquakes data are normally available from only a small number of locations in structure, and input as well as output noise exist in the records, it is easier to estimate the parameters of the dominant modes in the record rather than all the elements in the stiffness and the damping matrices of the structure as a whole. This assumption makes it possible to consider the model as a single-degree-of-freedom system even when the response spectrum shows the presence of other modes. Results of a simulation study are presented along with the response data of the Union-Bank building during the 1971 San Fernando Valley earthquake.