단기 및 장기계측자료를 이용한 가거초 해양과학기지의 모드특성 분석

Title
단기 및 장기계측자료를 이용한 가거초 해양과학기지의 모드특성 분석
Alternative Title
Estimation of Modal Characteristics of Gageocho Ocean Research Station Using Short-Term and Long-Term Measurement Data
Author(s)
이진학; 김원술; 민인기; 심재설
KIOST Author(s)
Yi, Jin Hak(이진학)Min, In Ki(민인기)
Publication Year
2018-11-14
Abstract
In order to study ocean and meteorological issues related to the global climate change and global warming, Korea has been operating several ocean research stations (ORS) in remote ocean area including Ieodo ORS since 2003, Gageocho ORS since 2009 and Sochengcho ORS since 2014. In 2011, the Gageocho ORS was attacked by Typhoon Muifa and it was severely damaged to its structural members including several observation devices. After that, the Gageocho ORS was rehabilitated with 5 m heightening considering the extreme wave height with 100 years of return period, and the dynamic response measurement system was also instrumented to investigate the structural characteristics of jacket-type offshore structures and to assess the structural integrity of the Gageocho ORS. In this study, the structural dynamic characteristics of the Gageocho ORS were investigated using the short-term and long-term measurement data including acceleration and inclination. As aresult, natural frequencies of lower two bending modes and one torsional mode were estimated as 1.79, 1.82, 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 variation when the acceleration response was larger. The damping ratio was estimated as about 0.7%. It is expected that the present results obtained from short- and long-term monitoring can be used to build the essential database for
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22876
Bibliographic Citation
The 7th Asia-pacific Workshop on Structural Health Monitoring Congress, pp.901 - 910, 2018
Publisher
The Hong Kong Polytechnic University
Type
Conference
Language
English
Publisher
The Hong Kong Polytechnic University
Related Researcher
Research Interests

Coastal Disaster Prevention,Construction of Ocean Research Station,연안방재,해양과학기지 구축

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