| Hybrid Analysis Approach for Stochastic Response of Offshore Jacket Platforms |
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| 作者姓名： | 金伟良 郑忠双 李海波 张立 |
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| 作者单位： | JIN Weiliang ZHENG Zhongshuang LI Haibo ZHANG Li
1 Professor，Dr.-Ing.，Institute of Structural Engineering (ISE)，Department of Civil Engineering (DCE)，Zhejiang University，Hangzhou 310027，P. R. China
2 Doctor Candidate，ISE，DCE，Zhejiang University，Hangzhou 310027，P. R. China
3 Lecturer，Dr.-Ing.，ISE，DCE，Zhejiang University，Hangzhou 310027，P. R. China
4 Dr. -Ing.，ISE，DCE，Zhejiang University，Hangzhou 310027，P. R. China |
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| 摘 要： | The dynamic response of offshore platforms is more serious in hostile sea environment than inshallow sea.In this paper,a hybrid solution combined with analytical and numerical method is proposedto compute the stochastic response of fixed offshore platforms to random waves,considering wave-struc-ture interaction and non-linear drag force.The simulation program includes two steps:the first step is theeigenanalysis aspects associated the structure and the second step is response estimation based on spectralequations.The eigenanalysis could be done through conventional finite element method conveniently andits natural frequency and mode shapes obtained.In the second part of the process,the solution of theoffshore structural response is obtained by iteration of a series of coupled spectral equations.Consideringthe third-order term in the drag force,the evaluation of the three-fold convolution should be demanded fornonlinear stochastic response analysis.To demonstrate this method,a numerical analysis is carrie
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Hybrid Analysis Approach for Stochastic Response of Offshore Jacket Platforms |
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| JIN Weiliang.Hybrid Analysis Approach for Stochastic Response of Offshore Jacket Platforms[J].China Ocean Engineering,2000,14(2):143-152. |
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| Authors: | JIN Weiliang |
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| Abstract: | The dynamic response of offshore platforms is more serious in hostile sea environment than in shallow sea. In this paper, a hybrid solution combined with analytical and numerical method is proposed to compute the stochastic response of fixed offshore platforms to random waves, considering wave-structure interaction and non-linear drag force. The simulation program includes two steps: the first step is the eigenanalysis aspects associated the structure and the second step is response estimation based on spectral equations. The eigenanalysis could be done through conventional finite element method conveniently and its natural frequency and mode shapes obtained. In the second part of the process, the solution of the offshore structural response is obtained by iteration of a series of coupled spectral equations. Considering the third-order term in the drag force, the evaluation of the three-fold convolution should be demanded for nonlinear stochastic response analysis. To demonstrate this method, a numerical analysis is carried out for both linear and non-linear platform motions. The final response spectra have the typical two peaks in agreement with reality, indicating that the hybrid method is effective and can be applied to offshore engineering. |
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| Keywords: | offshore platform stochastic response non-linear drag force hybrid analysis wave-structure interaction |
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