A Full Dynamic Compound Inverse Method for output-only element-level system identification and input estimation from earthquake response signals

作者：Pioldi Fabio; Rizzi Egidio^*

来源：Computational Mechanics, 2016, 58(2): 307-327.

DOI：10.1007/s00466-016-1292-0

• Structural identification
• Iterative optimization algorithm
• Modal dynamic identification
• Estimated unknown seismic input
• Element-level system identification

This paper proposes a new output-only element-level system identification and input estimation technique, towards the simultaneous identification of modal parameters, input excitation time history and structural features at the element-level by adopting earthquake-induced structural response signals. The method, named Full Dynamic Compound Inverse Method (FDCIM), releases strong assumptions of earlier element-level techniques, by working with a two-stage iterative algorithm. Jointly, a Statistical Average technique, a modification process and a parameter projection strategy are adopted at each stage to achieve stronger convergence for the identified estimates. The proposed method works in a deterministic way and is completely developed in State-Space form. Further, it does not require continuous- to discrete-time transformations and does not depend on initialization conditions. Synthetic earthquake-induced response signals from different shear-type buildings are generated to validate the implemented procedure, also with noise-corrupted cases. The achieved results provide a necessary condition to demonstrate the effectiveness of the proposed identification method.

• 出版日期2016-8