Structural model updating of the Gageocho Ocean Research Station using mass reallocation method SCIE SCOPUS KCI

Cited 4 time in WEB OF SCIENCE Cited 4 time in Scopus
Title
Structural model updating of the Gageocho Ocean Research Station using mass reallocation method
Author(s)
Kim, Byungmo; Yi, Jin-Hak
KIOST Author(s)
Yi, Jin-Hak(이진학)
Publication Year
2020-09
Abstract
To study oceanic and meteorological problems related to climate change, Korea has been operating several ocean research stations (ORSs). In 2011, the Gageocho ORS was 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 height to account for 100-yr extreme wave height, and the vibration measurement system was equipped to monitor the structural vibrational characteristics including natural frequencies and modal damping ratios. In this study, a mass reallocation method is presented for structural model updating of the Gageocho ORS based on the experimentally identified natural frequencies. A preliminary finite element (FE) model was constructed based on design drawings, and several of the candidate baseline FE models were manually built, taking into account the different structural conditions such as corroded thickness. Among these candidate baseline FE models, the most reasonable baseline FE model was selected by comparing the differences between the identified and calculated natural frequencies; the most suitable baseline FE model was updated based on the identified modal properties, and by using the pattern search method, which is one of direct search optimization methods. The mass reallocation method is newly proposed as a means to determine the equivalent mass quantities along the height and in a floor. It was found that the natural frequencies calculated based on the updated FE model was very close to the identified natural frequencies. In conclusion, it is expected that these results, which were obtained by updating a baseline FE model, can be useful for establishing the reference database for jacket-type offshore structures, and assessing the structural integrity of the Gageocho ORS.
ISSN
1738-1584
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38584
DOI
10.12989/sss.2020.26.3.291
Bibliographic Citation
SMART STRUCTURES AND SYSTEMS, v.26, no.3, pp.291 - 309, 2020
Publisher
TECHNO-PRESS
Subject
FINITE-ELEMENT MODEL; DAMAGE IDENTIFICATION
Keywords
Gageocho Ocean Research Station; jacket-type offshore structure; model updating; mass reallocation method; pattern search
Type
Article
Language
English
Document Type
Article
Publisher
TECHNO-PRESS
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