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http://dx.doi.org/10.9765/KSCOE.2020.32.5.285

Identification of Dynamic Characteristics Using Vibration Measurement Data of Saemangeum Mangyeong Offshore Observation Tower and Numerical Model Updating by Pattern Search Method  

Park, Sangmin (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology)
Yi, Jin-Hak (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology)
Cho, Cheol-Ho (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
Park, Jin-Soon (Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.32, no.5, 2020 , pp. 285-295 More about this Journal
Abstract
In the case of small observation towers located at sea, it is necessary to confirm the change in dynamic characteristics due to the influence of environmental loads. In this study, the dynamic characteristics were analyzed and the numerical analysis model was designed through field dynamic response measurement on the Mangyeong Offshore Observation Tower (Mangyeong Tower) located near the Saemangeum Embankment. As a result of the measurement, the natural frequency was found to increase slowly as the tide level is lowered. In addition, it was confirmed that the same mode has two frequencies, which was judged to be a phenomenon in which the natural frequency was partially increased when the pile and the ground contacted by scouring. For numerical analysis, the upper mass, artificial fixity point, scour depth and fluid influences are reflected in the structural characteristics of the Mangyeong Tower. In addition, the model updating from the estimated natural frequency and pattern search algorithm was performed. From the model updating, it is expected that it can be applied to future studies on stability of Mangyeong Tower.
Keywords
Mangyeong Tower; natural frequency; artificial fixity point; scour depth; model updating;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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