Strain Concentrations in Pipelines With Concrete Coating

[+] Author and Article Information
O. B. Ness, R. Verley

Statoil, Postuttak, 7005 Trondheim, Norway

J. Offshore Mech. Arct. Eng 118(3), 225-231 (Aug 01, 1996) (7 pages) doi:10.1115/1.2828838 History: Received January 01, 1995; Revised February 16, 1996; Online December 17, 2007


This paper concerns the strain distribution, and in particular strain concentration in field joints, for concrete-covered pipelines during laying. A semi-analytical model, full-scale tests to verify the model, and results of a parameter study are described. The model is used to establish nonlinear moment-curvature curves at a number of cross sections on the concrete-coated pipe and in the field joint (FJ). These are used to establish a strain concentration factor (SCF) for the FJ, or characteristics for a varying stiffness model of a pipe for direct use in lay analyses. Constant moment, four-point bending tests have been conducted on 16-in and 20-in dia, concrete-coated pipes as well as material tests on the pipe steel, corrosion coating and concrete. The behavior of the pipe, and in particular the SCF at the field joints, is investigated and compared to predictions using the semi-analytical model. The model is found to give a good prediction of the SCF and strain distribution along the pipe joint, for both the steel and the concrete, and is suitable for use in lay analyses for the overbend of S-mode lay vessels.

Copyright © 1996 by The American Society of Mechanical Engineers
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