文档介绍：Marine Structures 21 (2008) 353–373
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Marine Structures
journal homepage: ate/
marstruc
Structural life assessment of oil and gas risers
under vortex-induced vibration
Mohammad Iranpour a, Farid Taheri a,*, J. Kim Vandiver b
a Department of Civil and Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS B3J 1Z1, Canada
b Department of Mechanical Engineering, Massachusetts Institute of Technology,
77 Massachusetts Avenue, Room 5-222, Cambridge, MA 01239, USA
article info abstract
Article history: Estimating the fatigue damage due to vortex-induced vibration
Received 10 August 2007 (VIV) is an important issue when considering oil and gas risers
Received in revised form 21 January 2008 used in the offshore industry. In severe current profiles, especially
Accepted 9 February 2008
in very deep waters, the VIV-induced fatigue damage could result
in a relatively short life for risers. As water depth increases, the
Keywords: riser requires thicker wall to keep the stresses within the allowable
Risers
limit of the material. Moreover, risers may interfere with each
Fatigue
Vortex-induced vibration (VIV) other in deep waters, which is not acceptable to the current design
Variable amplitude loading guidelines. Therefore, the current design philosophy prevents the
Paris model riser clashing, which results in very expensive systems. As an alter-
Walker model native approach, such as the one mended by the new provi-
Barsom model sions of DNV, interference and collision of risers are allowed.
Hudson model However, such an approach is only mended for a riser that
Rainflow has been designed based on full consideration of VIV and
a state-of-the-art fatigue analysis.
In this research, the field data on multimodal vibration of a long
flexible riser is used to conduct a series of experimental tests for
fatigue life estimation of risers. The resulting VIV imposes a vari-
able amplitu