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The analysis is carried out in order to predict the out-of-plane bending moment (OoPBM) loads at the blade root and tower base moment (TBM) loads for a 5\u2009MW offshore floating wind turbine of different floater configuration. The spar-type and semisubmersible type offshore floating wind turbines are considered for the analysis. The FAST code is used to simulate the wind conditions for various return periods and the design loads of various floating wind turbine configurations. The extreme and operation situation of the spar-type and semisubmersible type offshore floating wind turbine are analyzed using one-dimensional (1D) and two-dimensional (2D)-EC methods for different return periods. The study is useful to predict long-term design loads for offshore wind turbines without requiring excessive computational effort.<\/jats:p>","DOI":"10.1115\/1.4032099","type":"journal-article","created":{"date-parts":[[2015,11,27]],"date-time":"2015-11-27T08:31:03Z","timestamp":1448613063000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":36,"title":["Long-Term Extreme Load Prediction of Spar and Semisubmersible Floating Wind Turbines Using the Environmental Contour Method"],"prefix":"10.1115","volume":"138","author":[{"given":"D.","family":"Karmakar","sequence":"first","affiliation":[{"name":"Centre for Marine Technology and Ocean Engineering, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, Lisboa 1049-001, Portugal"}]},{"given":"Hasan","family":"Bagbanci","sequence":"additional","affiliation":[{"name":"Centre for Marine Technology and Ocean Engineering, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, Lisboa 1049-001, Portugal"}]},{"given":"C.","family":"Guedes Soares","sequence":"additional","affiliation":[{"name":"Centre for Marine Technology and Ocean Engineering, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, Lisboa 1049-001, Portugal e-mail:"}]}],"member":"33","published-online":{"date-parts":[[2016,1,6]]},"reference":[{"key":"2019100616133258500_bib1","unstructured":"Winterstein, S. R., Ude, T. C., Cornell, C. 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