A cross spectrum based modal identification technique, which has been developed by the authors, is examined on the applicability to ambient vibration records of buildings, and its theoretical background is also reviewed. The modal identification technique is extended from the spectral estimation scheme based on an autoregressive moving-average and moving-average (ARMAMA) model, which has following advantages: (1) Owing to cross spectrum based technique, it is not necessary to presume relationships between inputs and outputs; (2) Modal characteristics of a building can be identified accurately, even using records contaminated with local noises due to mechanical vibration or local member vibration.
展开▼
