SYMPOSIA PAPER Published: 01 January 1986
STP19331S

Observations, Predictions, and Prevention of Fatigue Cracking in Offshore Structures

Source

In the past, during transit of jack-up offshore drill rigs, vortex shedding caused the initiation of fatigue cracks at certain details. The problem was defined as an interaction of cyclic stresses introduced by column vortex shedding and tensile residual stresses in the details. The paper outlines two simultaneous approaches to solution of the problem: (1) elimination of vortex shedding through structural modifications, that is, addition of helical strakes or spoilers, and (2) determination, by experiment, whether thermal stress-relief was beneficial. Also reviewed are the development and experimental corroboration of a local-strain life prediction method applicable to this and other structural fatigue problems.

Author Information

Reemsnyder, HS
Bethlehem Steel Corporation, PA
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Details
Developed by Committee: E08
Pages: 136–152
DOI: 10.1520/STP19331S
ISBN-EB: 978-0-8031-4983-0
ISBN-13: 978-0-8031-0485-3