Seismic Reliability Analysis of Offshore Wind Turbine with Twisted Tripod Support using Subset Simulation Method

Kwang-Yeun Park; Wonsuk Park

doi:10.7734/COSEIK.2019.32.2.125

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2019 Vol.32, Issue 2 Preview Page Next Page

Seismic Reliability Analysis of Offshore Wind Turbine with Twisted Tripod Support using Subset Simulation Method 부분집합 시뮬레이션 방법을 이용한 꼬인 삼각대 지지구조를 갖는 해상풍력발전기의 지진 신뢰성 해석

2019. pp. 125-132

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Abstract

This paper presents a seismic reliability analysis method for an offshore wind turbine with a twisted tripod support structure under earthquake loading. A three dimensional dynamic finite element model is proposed to consider the nonlinearity of the ground-pile interactions and the geometrical characteristics of the twisted tripod support structure where out-of-plane displacement occurs even under in-plane lateral loadings. For the evaluation of seismic reliability, the failure probability was calculated for the maximum horizontal displacement of the pile head, which is calculated from time history analysis using artificial earthquakes for the design return periods. The application of the subset simulation method using the Markov Chain Monte Carlo(MCMC) sampling is proposed for efficient reliability analysis considering the limit state equation evaluation by the nonlinear time history analysis. The proposed method can be applied to the reliability evaluation and design criteria development of the offshore wind turbine with twisted tripod support structure in which two dimensional models and static analysis can not produce accurate results.

Keywords

offshore wind turbine

twisted tripod support

seismic reliability

subset simulation

Markov Chain Monte Carlo

이 논문에서는 지진 하중을 받는 꼬인 삼각대 지지구조를 갖는 해상풍력발전기의 지진 신뢰성 해석 방법을 제시한다. 수 평하중에 대해서 면외 변위가 발생하는 꼬인 삼각대지지 구조의 기하학적 특성과 지반의 비선형성을 포함한 지반-말뚝 상 호작용을 고려하기 위한 구조물의 3차원 동적 유한요소 모델을 제시하였다. 지진신뢰성 평가를 위해 재현주기별 인공지진파를 사용한 시간이력 해석을 통해 말뚝 두부의 수평변위로 정의된 한계 상태식에 대하여 파괴확률을 산정하였다. 비선형 시간이 력해석에 의한 한계상태식 평가를 고려하여 효율적으로 신뢰성 해석을 하기 위해 Markov Chain Monte Carlo 샘플링 방법 을 적용한 부분집합 시뮬레이션 방법의 적용을 제시하였다. 제시한 방법은 2차원 모델 및 정적해석만으로는 정확한 결과를 도출할 수 없는 꼬인 삼각대 지지구조를 갖는 해상풍력발전기의 신뢰성 평가 및 설계기준 개발에 활용될 수 있음을 보였다.

키워드

해상풍력발전기

꼬인 삼각대 지지구조

지진 신뢰성

부분집합 시뮬레이션

Markov Chain Monte Carlo

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 32
No :2
Pages :125-132
Received Date : 2018-12-31
Revised Date : 2019-01-08
Accepted Date : 2019-01-09
DOI :https://doi.org/10.7734/COSEIK.2019.32.2.125

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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