| An Application of Direct Ritz Method for Random Seismic Responses of Jacket Platforms |
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| 作者姓名： | 韩晓双 马骏 赵德有 周波 |
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| 作者单位： | Department of Naval Architecture Dalian University of Technology，Department of Naval Architecture Dalian University of Technology，Department of Naval Architecture Dalian University of Technology，Department of Naval Architecture Dalian University of Technology，Dalian 116023 China Dalian 116023 China Dalian 116023 China Dalian 116023 China |
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| 摘 要： | 1 .IntroductionNowadays tremendous efforts have been devotedtothe analysis of randomseismic responses .Forexample ,American PetroleumInstitute (API) has declared that the analysis of randomseismic re-sponsesis a useful tool for safety inspection. Owing to the complexity of platformand randomness ofload,it is difficult to carry out the randomresponse analysis of a jacket platform. The conventionalrandomvibration methods ,such as square root of the sumof squares (SRSS) and complete quadratic…
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| 关 键 词： | 导管架平台 随机地震响应 里茨直接法 伪激励法 |
| 收稿时间： | 2006-05-01 |
| 修稿时间： | 2006-08-10 |
An Application of Direct Ritz Method for Random Seismic Responses of Jacket Platforms |
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| HAN Xiao-shuang,MA Jun,ZHAO De-you,ZHOU Bo.An Application of Direct Ritz Method for Random Seismic Responses of Jacket Platforms[J].China Ocean Engineering,2006,20(4):673-679. |
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| Authors: | HAN Xiao-shuang MA Jun ZHAO De-you ZHOU Bo |
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| Abstract: | In this paper, the jacket platform is simulated by a non-uniform cantilever beam subjected to axial force. Based on the Hamilton theory, the equation of bending motion is developed and solved by the classical Ritz method combined with the pseudo-excitation method for random responses with non-classical damping. Usually, random responses of this continuous structure are obtained by orthogonality of modes, and some normal modes of the structure are needed, causing inconvenience for the analysis of the non-uniform beam whose normal modes are not easy to be obtained. However, if the pseudo-excitation method is extended to calculate random responses by combining it with the classical Ritz method, the responses of a non-uniform beam, such as auto-PSD function, cross-PSD and higher spectral moments, can be solved directly avoiding the calculation of normal modes. The numerical results show that the present method is effective and useful in aseismic design of platforms. |
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| Keywords: | jacket platform random seismic response pseudo-excitation method Ritz method |
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