Full Content is available to subscribers

Subscribe/Learn More  >

Analytical Methodology for Wave Fatigue Analysis on Riser Suspended and Moored by Chains (RSAA) Configurations

[+] Author Affiliations
Victor Milanez da Silva Pereira, Marcos Queija, Claudio Marcio Silva Dantas, Gilberto Bruno Ellwanger

LACEO: Laboratory of Analysis and Reliability of Offshore Structures, Rio de Janeiro, Brazil

Paper No. OMAE2015-41068, pp. V05AT04A002; 8 pages
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5A: Pipeline and Riser Technology
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5651-2
  • Copyright © 2015 by ASME


As oil exploration moves into fields located in deep water, the need for developing new concepts of riser systems aiming at reducing the influence of environmental loads consequently increases. Therefore, a new riser configuration called RSAA (riser suspended and moored by chains - in Portuguese) is proposed. This structure consists on a rigid vertical riser connected on its top to a floating unit and on its bottom to flexible and mooring lines segments. This new configuration improves the structural response for some of the most critical points in riser design: top tensions and bending moments at the touch down zone.

Feasibility analyses have shown that the vertical riser is the most critical part of the proposed system due to the high level of vertical motions and dynamic tension. Therefore, a parametric study is vital in order to understand the system’s behavior as well as to establish the main parameters which influence its structural behavior. Analytical methods may require some slight simplifications of the problem to be applicable, but they generally lead to compact formulas that do explain which parameters influence the results and why and how it does so.

This work proposes an analytical model that evaluates the vertical motions and axial tension along the vertical riser subjected to wave loads applied to the floating unit. This procedure could enable parametric studies and the evaluation of the stress amplitudes and, consequently, the fatigue damage along the vertical riser of the RSAA configurations. Furthermore, this work aims to show that this methodology is a fast and effective pre-design tool by comparing it with a nonlinear time domain finite element method analysis.

Copyright © 2015 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In