Design Situations and Limit States in the Design of Arctic Offshore Structures

Design of arctic offshore structures, and especially the codification of the design approach as in ISO 19906, the International Standard for the design of arctic offshore structures, requires going beyond the empirical, pragmatic solutions that have been developed for offshore structures in mature, temperate regions. The limit states design philosophy, embodied in ISO 19906, provides an approach for addressing design situations arising from operational, extreme, abnormal, and accidental events so that the desired structural reliability is verified for the relevant limit states. The philosophy also needs to accommodate the effects of operating philosophy and measures (e.g. ice management, disconnection of floating structures). The Limit States Design procedure accounts for risk and reliability through the use of combinations of actions with specified probabilities, resistance formulations, partial factors, and limit states which arise from each design situation. The limit states for each design situation, such as component failure, local damage, or complete loss of structural integrity, depend on the design situation. Design verification, to confirm the required reliability for each design situation, is key to the design of safe and competitive structures. This paper discusses issues that are being considered in the current revisions of ISO 19906, and in ISO 19900 which is the overall philosophy and general requirements document.


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  • Accession Number: 01747250
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 20 2020 3:36PM