STOCHASTIC RESPONSES OF ANCHORED FLEXIBLE FLOATING ISLANDS SUBJECTED TO WIND-WAVES AND SEAQUAKES

This paper is concerned with a unified approach which predicts the stochastic responses of a flexible floating island, anchor system and sea water. The floating island is modelled as an elastic circular plate and the anchor system is considered to be composed of distributed tension-legs. Based on a linear potential flow theory, the hydrodynamic pressure generated on the bottom surface of the island is obtained in closed form. The modal equations of motion of the island with or without anchor system is derived by energy method. In the formulation, the dynamic interaction effects are estimated as hydrodynamic added mass, hydrodynamic added damping and hydrodynamic added stiffness. The response quantities are evaluated as root-mean-squared values using a linear random vibration theory. Numerical examples are presented to discuss the effects of hydrodynamic radiation damping, anchor system, and wind-wave and seaquake characteristics on the stochastic responses of flexible floating islands.

• Supplemental Notes:
  • ISOPE 91, 1st Intnl Offshore & Polar Engng Conference; 11-16 Aug 1991; Edinburgh, U.K. Sponsored by Intl Soc Offshore & Polar Engrs (ISOPE) et al. Procs. Publ by ISOPE, ISBN 0-9626104-61. Vol III, p 391 [8 p, 13 ref, 7 fig]
• Authors:
  • Hamamoto, T
  • TAKAHASHI, H
  • Tanaka, Y
• Publication Date: 1991

Language

• English

Subject/Index Terms

• TRT Terms: Dynamic loads; Offshore structures
• Uncontrolled Terms: Dynamic response; Fluid-structure interaction
• Old TRIS Terms: Artificial islands
• Subject Areas: Bridges and other structures; Marine Transportation;

Filing Info

• Accession Number: 00702644
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM