가거초 해양과학기지 구조물 동특성을 이용한 해석모델 개선 KCI

Title
가거초 해양과학기지 구조물 동특성을 이용한 해석모델 개선
Alternative Title
Model Updating for Gageocho Ocean Research Station Structure Using Structural Dynamic Characteristics
Author(s)
김병모; 김찬영; 이진학
KIOST Author(s)
Yi, Jin Hak(이진학)
Publication Year
2019-07
Abstract
In order to study oceanic environmental changes affecting the climate change and global warming, the Korean government supports the construction and operation of several ocean research stations (ORS) such as Ieodo ORS, Gageocho ORS and Sochengcho ORS in remote area. Among these ORSs, the Gageocho ORS was directly attacked by Typhoon Muifa in 2011 and its structural members were severely damaged. After this structural failure, the Gageocho ORS was rehabilitated and instrumented with dynamic measurement system. In this study, the preliminary finite element (FE) model of the repaired Gageocho ORS was updated using the natural frequencies estimated by the measurement. Mass reallocation method and the pattern search method were utilized for the FE model updating. The former was applied to rationally redistribute the lumped mass ignored in static analysis in platform and the latter was used to obtain the optimal values for mass redistribution as well as other material properties such as an elastic modulus of concrete.
This significantly reduced the errors of natural frequencies for the estimated values by under 1% from larger than 15% in the preliminary FE model. The updated baseline FE model can be useful for further performance analysis including reliability analysis, wave and seismic analysis, and also for structural health monitoring.
ISSN
2288-7903
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/583
Bibliographic Citation
한국연안방재학회지, v.6, no.3, pp.103 - 110, 2019
Publisher
(사)한국연안방재학회
Keywords
Gageocho Ocean Research Station; modal parameter; FE model updating; mass reallocation method; pattern search method
Type
Article
Language
Korean
Publisher
(사)한국연안방재학회
Related Researcher
Research Interests

Ocean Energy-Tidal Current Energy Converter System,Infrastructure Management-Structural Health Monitoring,Offshore Wind,해양에너지-조류발전시스템,시설물 유지관리-구조건전성 평가,해상풍력

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