標題: | Identification of Instantaneous Modal Parameters of a Nonlinear Building via a Gabor-frame-based Approach |
作者: | Su, Wei-Chih Huang, Chiung-Shiann Lien, Ho-Cheng 土木工程學系 Department of Civil Engineering |
關鍵字: | instantaneous modal parameters;Gabor transform;time-varying series model |
公開日期: | 2016 |
摘要: | This work presents the use of a Gabor transform to deteunine the instantaneous modal parameters (natural frequencies, damping ratios and mode shapes) of a structure from its dynamical responses, such as free vibration or earthquake response. The Gabor transform is applied to the measured acceleration responses of a structural system for reconstructing the time-varying time series model in time-frequency domain. The instantaneous modal parameters of a time-varying system can be directly estimated from the time-varying model coefficients. The proposed procedure is further applied to process the dynamic responses of three-storey steel frames with or without nonlinear elements from the simulated earthquake events via SAP2000 to identify the differences among the frames. The linear or nonlinear behaviors of these steel frames under earthquake input are accurately reflected in the instantaneous natural frequencies that are obtained by the proposed approach. |
URI: | http://hdl.handle.net/11536/136210 |
ISBN: | 978-1-4673-9888-6 |
期刊: | PROCEEDINGS OF 2016 INTERNATIONAL CONFERENCE ON APPLIED SYSTEM INNOVATION (ICASI) |
顯示於類別: | 會議論文 |