ASEISMIC DESIGN OF OFFSHORE PLATFORMS

A state-of-the-art procedure for the earthquake resistant sign of offshore platforms is presented. The dual design philosphy is reviewed and it is pointed out that in certain cases, it is prudent to distinguish between the drilling and production phases in formulating the design criteria. The interaction of the soil-pile system with the platform and the effects of water-structure interaction are discussed. Engineering procedures to account for the above effects in design are also reviewed. Concepts and guidelines for the design of offshore platforms are presented. Procedures to develop structural and foundation configurations as well as factors to be considered in the selection of preliminary member sizes are discussed. The parameters which will have a major influence on the platform dynamic behavior are identified and their possible effects discussed. The dynamic behavior of offshore platforms is illustrated by presenting the analysis of a jacket in 500 feet of water depth. Response of the structure to two different types of response spectra is evaluated. Results presented include natural periods, participation factors, lateral force distributions, deflections and mudline forces. Finally, areas where additional research is needed to improve existing design procedures are identified. /Author/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 660-684

Subject/Index Terms

Filing Info

  • Accession Number: 00179773
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM