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torsional response Analysis of Flexible Pipe Based on Theory and Finite Element Method

China Ocean Engineering 2023年第2期37卷 190-203页

作者： LEI Qing-long ZHU Xiao-hua School of Mechanical Engineering Southwest Petroleum UniversityChengdu 610500China Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan Province Chengdu 610500China

As key components connecting offshore floating production platforms and subsea imports, offshore flexible pipes play significant roles in oil, natural gas, and water injection. It is found that torsional failure is one of the failure modes of flexible pipes during transportation and laying. In this paper, a theoretical model(TM) of a flexible pipe section mechanics is established, in which the carcass layer and the pressure armor layer are equivalent to the orthogonal anisotropic layers due to its complex cross-section structure. The calculation results of the TM are consistent with those of a finite element model(FEM), which can accurately describe the torsional response of the flexible pipe.Subsequently, the TM and FEM are used to discuss the influence of boundary conditions on the torsional response.The structure of the flexible pipe is stable when twisted counterclockwise. However, limiting the top axial displacement can improve the axial and radial instability of the tensile armor layer when twisted clockwise. Finally, it is recommended that the flexible pipe can be kept under top fixation during service or installation to avoid torsional failure.

关键词： flexible pipe torsional response analytical model finite element model

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torsional response of the Offshore Platform with TMD

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China Ocean Engineering 2001年第2期16卷 309-314页

作者：江宜城唐家祥 College of Civil Engineering Huazhong University of Science and Technology Wuhan 430074 China

It is pointed out in this paper that the offshore platform could be controlled by means of the Tuned Mass Damper (TMD) if there is torsional vibration in the system. The effectiveness of the location of TMD is quantified with the help of the response ratio between the peak responses of the system in the presence and in the absence of TMD. In addition, the parameters of frequency and damping ratio of TMD are optimized.

关键词： tuned mass damper offshore platform optimal parameters torsional response

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Pushover analysis of asymmetric-plan buildings based on distribution of the combined modal story shear and torsional moment

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Earthquake Engineering and Engineering Vibration 2014年第4期13卷 707-716页

作者： Kazem Shakeri Karim Tarbali Mohtasham Mohebbi Faculty of Engineering University of Mohaghegh Ardabili International Institute of Earthquake Engineering and Seismology

A pushover procedure with a load pattern based on the height-wise distribution of the combined modal story shear and torsional moment is proposed to estimate the seismic response of 3D asymmetric-plan building frames. Contribution of the higher modes and torsional response of asymmetric-plan buildings are incorporated into the proposed load pattern. The proposed pushover method is a single-run procedure, which enables tracing the nonlinear response of the structure during the analysis and averts the elusiveness of conducting multiple pushover analyses. The proposed method has been used to estimate the response of two moment-resisting building frames with 9 and 20 stories. The obtained results indicate the appropriate accuracy and efficiency of the proposed procedure in estimating the trend of the drift profiles of the structures resulted from nonlinear time history analyses.

关键词： pushover analysis asymmetric-plan building torsional response story shear torsional moment

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