가거초 해양과학기지 장기 진동 모니터링 및 모델 개선

Title
가거초 해양과학기지 장기 진동 모니터링 및 모델 개선
Alternative Title
Long-Term Vibration Monitoring and Model Updating of Gageocho Ocean Research Station
Author(s)
이진학; 김병모; 민인기; 심재설
KIOST Author(s)
Yi, Jin-Hak(이진학)Min, In Ki(민인기)Shim, Jae Seol(심재설)
Alternative Author(s)
이진학; 민인기; 심재설
Publication Year
2019-08-29
Abstract
In order to study ocean and meteorological issues related to the climate change, Korea has been operating several ocean research stations (ORS) in remote ocean area including Ieodo ORS since 2003, Gageocho ORS since 2009 and Sochengcho ORSsince 2014. In 2011, the Gageocho ORS was directly attacked by Typhoon Muifa and its structural members and several observation devices were severely damaged. After this event, the Gageocho ORS was rehabilitated with 5 m heightening considering the 100-year extreme wave height, and the vibration measurement system was also instrumented to monitor the structural vibrational characteristics and to assess the structural integrity of the Gageocho ORS. In this study, the modal characteristics of the Gageocho ORS were identified and investigated using the long-term measurement data. As a result, natural frequencies of lower two bending modes and one torsional mode were reliably estimated as around 1.78, 1.82, and 2.65 Hz, respectively. It was also found that the damping ratios in the first mode could be more consistently obtained with lower level of uncertainty when the acceleration response was larger. The damping ratio was estimated as about 0.7%, 0.6%, and 0.5% for lower three modes, respectively. A preliminary finite element (FE) model was constructed using the design drawings and the several candidate baseline FE models were manually built considering different structural conditions
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22414
Bibliographic Citation
Fifth Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures, pp.1 - 8, 2019
Publisher
BAM & EMPA
Type
Conference
Language
English
Publisher
BAM & EMPA
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