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Nonlinear Foundation Spring and Calibration Using Measured Dynamic Response of Structure

[+] Author Affiliations
Amir M. Kaynia, Karin Norén-Cosgriff, Knut H. Andersen

Norwegian Geotechnical Institute, Oslo, Norway

Kjell Arvid Tuen

Statoil, Stavanger, Norway

Paper No. OMAE2015-41236, pp. V001T01A024; 6 pages
doi:10.1115/OMAE2015-41236
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5647-5
  • Copyright © 2015 by ASME

abstract

Some offshore platforms need modifications or addition of new modules that require re-assessment of their design. An economical way of allowing for changes without major strengthening of the platform is by reducing the safety margin used in the original design by use of measured data during the operation. This paper presents application of this concept to Troll A platform in which the measured changes in the platform’s natural periods due to the nonlinear soil behavior under different storm conditions were used to calibrate the soil-foundation spring adopted in the design.

Copyright © 2015 by ASME

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