고정식 해양구조물의 동특성 및 구조손상 평가를 위한 실험 연구

Title
고정식 해양구조물의 동특성 및 구조손상 평가를 위한 실험 연구
Alternative Title
Experimental Study for Evaluation of Dynamic Characteristics and Structural Damage on Fixed-type Offshore Structures
Author(s)
정병진; 박종웅; 이진학; 박진순
KIOST Author(s)
Yi, Jin Hak(이진학)
Publication Year
2014-08-28
Abstract
It is greatly crucial to monitor the structural dynamic characteristics such as natural frequencies and mode-shapes especially for tidal current power plants under strong tidal current environment because changes in dynamic characteristics are directly associated with structural integrity conditions. From the previous observation through long-term measurement for Uldolmok tidal current power plant structure, it was shown that the natural frequencies are fluctuated with certain cycle periods, i.e. twice a day and twice a month as changes of tidal height and tidal current velocity, and also it was reported that the construction work had a lot of trouble especially in connecting jacket support structure and its pile foundation. Therefore there is a necessity to investigate the reason of the fluctuation of natural frequencies and the integrity of pile foundation. In this study, a lab-scale experimental study was conducted using a circulating water channel. The natural frequency was extracted from measured acceleration by using frequency domain output-only modal identification method, i.e. peak-picking method. And then the experimental model was also verified with numerical model using ABAQUS. As a result, it was shown that the fluctuation of natural frequencies was governed by the decrease in stiffness at the foundation. It can be explained that the damage at foundation is much more crucial than the effect of added massare directly associated with structural integrity conditions. From the previous observation through long-term measurement for Uldolmok tidal current power plant structure, it was shown that the natural frequencies are fluctuated with certain cycle periods, i.e. twice a day and twice a month as changes of tidal height and tidal current velocity, and also it was reported that the construction work had a lot of trouble especially in connecting jacket support structure and its pile foundation. Therefore there is a necessity to investigate the reason of the fluctuation of natural frequencies and the integrity of pile foundation. In this study, a lab-scale experimental study was conducted using a circulating water channel. The natural frequency was extracted from measured acceleration by using frequency domain output-only modal identification method, i.e. peak-picking method. And then the experimental model was also verified with numerical model using ABAQUS. As a result, it was shown that the fluctuation of natural frequencies was governed by the decrease in stiffness at the foundation. It can be explained that the damage at foundation is much more crucial than the effect of added mass
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/26048
Bibliographic Citation
ASHMCS 2014, pp.1 - 4, 2014
Publisher
LANL-CBNU
Type
Conference
Language
English
Publisher
LANL-CBNU
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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