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http://dx.doi.org/10.7734/COSEIK.2019.32.2.125

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

Park, Kwang-Yeun (Seismic Safety Research Center, Korea Institute of Civil Engineering and Building Technology)
Park, Wonsuk (Department of Civil Engineering, Mokpo National University)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.32, no.2, 2019 , pp. 125-132 More about this Journal
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;
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Times Cited By KSCI : 4  (Citation Analysis)
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