USE OF RISK ANALYSIS TO EVALUATE THE SEAWORTHINESS OF OFFSHORE STRUCTURES

Risk analysis is an important method in the design of efficient and safe offshore structures, and at Germanischer Lloyd the method is well established in relation to quality assurance and classification. The Authors, of Germanishcer Lloyd, here discuss risk evaluation and its basis of long-term cumulative distributions of the design parameters that influence the seaworthiness of these structures. It is shown how risk distribution functions can be derived from cumulative distribution functions and how safe design values are defined in relation to specified risk levels. Detailed examples given to illustrate the procedures include two modern designs which have obtained a quality assurance at Germanishcer Lloyd; they are a semi-submersible LNG liquefaction platform with a built-in concrete LNG tank, and a semi-submersible drilling platform. Among the aspects discussed in these examples are the platform clearance above the water level, the definition of safe design values of loads that occur independently but have to be combined in a structural analysis, and the inadequacy of applying safety factors alone. Order from BSRA as No. 54,255.

  • Corporate Authors:

    CML Publications

    Ashurst Lodge, Ashurst
    Southampton, Hampshire,   England 
  • Authors:
    • Ostergaard, C
    • Schellin, T E
  • Publication Date: 1980-7

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00323264
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Feb 18 1981 12:00AM