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Smart Structures and Systems Volume 10, Number 6, December 2012 , pages 517-546 DOI: https://doi.org/10.12989/sss.2012.10.6.517 |
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Vibration-based damage monitoring of harbor caisson structure with damaged foundation-structure interface |
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So-Young Lee, Khac-Duy Nguyen, Thanh-Canh Huynh, Jeong-Tae Kim, Jin-Hak Yi and Sang-Hun Han
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| Abstract | ||
| In this paper, vibration-based methods to monitor damage in foundation-structure interface of harbor caisson structure are presented. The following approaches are implemented to achieve the objective. Firstly, vibration-based damage monitoring methods utilizing a variety of vibration features are selected for harbor caisson structure. Autoregressive (AR) model for time-series analysis and power spectral density (PSD) for frequency-domain analysis are selected to detect the change in the caisson structure. Also, the changes in modal parameters such as natural frequency and mode shape are examined for damage monitoring in the structure. Secondly, the feasibility of damage monitoring methods is experimentally examined on an unsubmerged lab-scaled mono-caisson. Finally, numerical analysis of un-submerged mono-caisson, submerged mono-caisson and un-submerged interlocked multiple-caissons are carried out to examine the effect of boundary-dependent parameters on the damage monitoring of harbor caisson structures. | ||
| Key Words | ||
| harbor caisson; foundation-structure interface; damage monitoring; autoregressive model; power spectral density; modal parameters | ||
| Address | ||
| So-Young Lee, Khac-Duy Nguyen, Thanh-Canh Huynh and Jeong-Tae Kim : Department of Ocean Eng., Pukyong National University, Busan, Korea Jin-Hak Yi and Sang-Hun Han : Coastal Development & Ocean Energy Research Dept., Korea Institute of Ocean Science and Technology (KIOST), Ansan, Korea | ||