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Smart Structures and Systems
  Volume 15, Number 2, February 2015 , pages 259-281

Structural identification of gravity-type caisson structure via vibration feature analysis
So-Young Lee, Thanh-Canh Huynh and Jeong-Tae Kim

    In this study, a structural identification method is proposed to assess the integrity of gravity-type caisson structures by analyzing vibration features. To achieve the objective, the following approaches are implemented. Firstly, a simplified structural model with a few degrees-of-freedom (DOFs) is formulated to represent the gravity-type caisson structure that corresponds to the sensors\' DOFs. Secondly, a structural identification algorithm based on the use of vibration characteristics of the limited DOFs is formulated to fine-tune stiffness and damping parameters of the structural model. Finally, experimental evaluation is performed on a lab-scaled gravity-type caisson structure in a 2-D wave flume. For three structural states including an undamaged reference, a water-level change case, and a foundation-damage case, their corresponding structural integrities are assessed by identifying structural parameters of the three states by fine-tuning frequency response functions, natural frequencies and damping factors.
Key Words
    structural identification; gravity-type caisson; simplified vibration model; wave flume; stiffness; damping, modal parameters
So-Young Lee, Thanh-Canh Huynh and Jeong-Tae Kim: Department of Ocean Engineering, Pukyong National University, Busan 608-737, Korea

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