장기 계측 데이터를 이용한 가거초 해양과학기지의 동특성 평가

• 영문명: Estimation of Dynamic Characteristics of Gageocho Ocean Research Station Using Long-term Measurement Data
• 발행기관: 한국연안방재학회
• 저자명: 김원술(Wonsul Kim) 이진학(Jin-Hak Yi) 민인기(In Ki Min) 심재설(Jae Seol Shim)
• 간행물 정보: 『한국연안방재학회지』제4권 제5호(특별호), 263~270쪽, 전체 8쪽
• 주제분류: 사회과학 > 사회과학일반
• 파일형태: PDF
• 발행일자: 2017.12.30

영문 초록

In order to study ocean and meteorological changes related to the global climate change and global warming, Korea is operating several ocean research stations (ORS) including Ieodo ORS, Gageocho ORS and Sochengcho ORS in remote ocean area. In 2011, the Gageocho ORS was attacked by Typhoon Muifa and was damaged to its structural members and various observation equipments. After that, the Gageocho ORS was reconstructed with increased height by 5m and then dynamic response measurement system has been built to assess the structural integrity of Gageocho ORS whether it is healthy or not. Using the measured dynamic response data including acceleration and tilt, the structural dynamic characteristics of the Gageocho ORS were investigated. As a result, three natural frequencies of the first two bending modes and the first torsional mode were estimated as 1.79 Hz, 1.82 Hz and 2.65 Hz, respectively, and the difference between natural frequencies for two bending modes is not significant because is almost symmetrical shape. It is also found that, when the acceleration response is larger, the damping ratios in first mode can be obtained more consistently with lower irregular fluctuations. The averaged damping ratio was about 0.7%. The present results and those obtained from long term monitoring can be used to identify and to assess the structural integrity of the Gageocho ORS, and can be useful in preliminary design of offshore structures.

목차

1. 서 론

2. 가거초 해양과학기지 구조물 개요 및 모니터링 시스템

3. 계측결과 및 고찰

4. 결론

키워드

Gageocho ocean research station Acceleration response Structural health monitoring Field measurement Long term measurement