Comparison on Structure Identification Method for Strong Earthquake Response Data

This study is mainly to analyze the earthquake response data, identify the structure dynamic characteristics by system identification methods.We can judge whether the structure dynamic characteristics is changed by the earthquake or not, and this is the main objective of the Structural Health Monitoring. This study apply four methods on the earthquake response data: (1)Subspace Identification, (2)Recursive Subspace Identification, (3)Recursive ARX model, and (4)Moving window Subspace Identification.We can realize the changes of structure system parameter by the long‐term seismic response monitoring of structures using subspace identification. It can help us to know the structure dynamic behavior in the past. And the other three methods can help us to realize the change of system parameters. If there are some damage in this structure,the system parameters will change, that include (1) natural frequency, (2) damping ratio, and(3)mode shape. However , these methods are all has its advantage and disadvantage,and this study also focusing on the comparison on these four methods. All the data we use in this study are from the Central Weather Bureau Structure Strong Earthquake Monitoring System.