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Stability and Frequency Response of Top-Tensioned Risers and SCR’s: The L/D Ratio in Perspective

[+] Author Affiliations
William Todd

Riser Analysis and Management LLC, Houston, TX

Paper No. OMAE2009-79549, pp. 531-541; 11 pages
doi:10.1115/OMAE2009-79549
From:
  • ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5: Polar and Arctic Sciences and Technology; CFD and VIV
  • Honolulu, Hawaii, USA, May 31–June 5, 2009
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4345-1 | eISBN: 978-0-7918-3844-0
  • Copyright © 2009 by ASME

abstract

Stability is closely linked to the dynamic behavior of risers and SCR’s. This paper reviews the L/D criterion as used to categorize offshore structural elements and places this criterion in perspective when used in VIV calculations to compare slender beams, beam-columns and cable behavior to anticipated results for top-tensioned risers with like L/D ratios. The stability of beam-columns with various end conditions and loadings are compared to that of an in-service 2400m top-tensioned riser. An analytic solution for the frequencies and mode shapes of top-tensioned risers at varying top-tension is given and factors which influence the dynamic behavior detailed. The analysis demonstrates that loads and representation of the load distribution are vital to obtaining valid results. Close-coupling of displacement and slope with loading are essential to the analysis. Results are shown of the effects of varying top-tension factor (TTF) on the stability and dynamic response of risers and SCR’s.

Copyright © 2009 by ASME

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