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Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

[+] Author Affiliations
Martin Storheim

Moss Maritime AS, Oslo, Norway

Hagbart S. Alsos

SINTEF Ocean, Trondheim, Norway

Jørgen Amdahl

Norwegian University of Science and Technology, Trondheim, Norway

Paper No. OMAE2017-61861, pp. V03AT02A006; 8 pages
doi:10.1115/OMAE2017-61861
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3A: Structures, Safety and Reliability
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5765-6
  • Copyright © 2017 by ASME

abstract

Evaluation of the nonlinear structural response of any structure is a challenging task; a range of input parameters are needed, most of which has significant statistical variability and the evaluations require a high degree of craftsmanship. Hence, high demands are set forth both to the analyst and the body in charge of verification of the results. Recent efforts by DNVGL attempts to mitigate this with the second edition of the DNVGL-RP-C208 for determination of nonlinear structural response, in which guidance or requirements are given on many of the challenging aspects.

This paper discuss the various challenges and the direction to which the RP-C208 points compared to published research. Parameters affecting the plastic hardening, strain-rate effects and ductile fracture are discussed separately. Then, the combined effect of the range of assumptions is evaluated to assess the resulting level of safety.

Copyright © 2017 by ASME

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