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Open AccessArticle

Frequency Domain Response of Jacket Platforms under Random Wave Loads

1
National Center for International Research of Subsea Engineering Technology and Equipment, Marine Engineering College, Dalian Maritime University, Dalian 116026, China
2
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
3
State Key Laboratory of Structural Analysis for Industrial Equipment, School of Naval Architecture Engineering, Dalian University of Technology, Dalian 116024, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(10), 328; https://doi.org/10.3390/jmse7100328
Received: 19 August 2019 / Revised: 14 September 2019 / Accepted: 17 September 2019 / Published: 21 September 2019
(This article belongs to the Special Issue Dynamics of Offshore Structures)
This article presents a procedure that simplifies an offshore jacket platform as a non-uniform cantilever beam subjected to an axial force. A Ritz method combined with a pseudo-excitation method is then used to analyze the responses of the jacket platform under random wave loads with the associated power spectral densities, variances and higher spectral moments. The theoretical basis and pertinent governing equations are derived. The proposed procedure not only eases the process of determining the pseudo wave loads, but also requires only the rudimentary structural details that are typically available at the preliminary design stage. Additionally, the merit of the proposed procedure is that the process does not require one to compute the normal modes, which saves time and is particularly convenient for the dynamic-response analysis of a complex structure (such as an offshore platform). An illustrative example based on a three-deck jacket platform is presented to demonstrate the procedure used to obtain the power spectral densities, variances and second spectral moments of jacket-top displacement and the bending moment of the jacket at the mud line. The results obtained are compared with those obtained using a Finite Element Mothed (FEM) model. Based on the findings of the study and good agreement shown in the comparison of results, it is concluded that the proposed method is effective, simple and convenient, and can be a useful tool for the preliminary design analysis of offshore platforms. View Full-Text
Keywords: Pseudo-excitation method; Ritz method; random wave load; random response; frequency domain response; FEM Pseudo-excitation method; Ritz method; random wave load; random response; frequency domain response; FEM
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Han, X.; Qiao, W.; Zhou, B. Frequency Domain Response of Jacket Platforms under Random Wave Loads. J. Mar. Sci. Eng. 2019, 7, 328.

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