Motion and Structural Response of a Hydroelastic Semi-Submersible Model to Waves and Ice Impacts

[+] Author and Article Information
H. El-Tahan

Arctec Newfoundland Limited

M. Arockiasamy, A. S. J. Swamidas

Memorial University, St. John’s, Newfoundland, Canada

J. Offshore Mech. Arct. Eng 109(1), 35-42 (Feb 01, 1987) (8 pages) doi:10.1115/1.3256988 History: Received March 06, 1985; Revised May 01, 1986; Online October 30, 2009


This paper presents the motion and structural responses of a model that is structurally and dynamically similar to a typical semi-submersible platform. The model is fabricated of high impact polystyrene sheets, 0.78 mm (0.03 in.) thick, and cellulose acetate butyrate (CAB) tubes (for bracings), 1.58 mm (0.06 in.) thick. The response of the model to regular and irregular waves under operating/survival conditions and impacts of modeled bergy-bits (prototype weights of 1000 t and 2000 t traveling at speeds of 1.0 to 4.0 m/s) was determined. In addition, the response of a damaged-corner-column semi-submersible to survival wave conditions was also examined. The motion and structural responses were monitored using 30 strain gages, an accelerometer and four potentiometer devices. The impact loads were simulated by weights swinging in a pendulum mode in still water. The motion RAOs, stress RAOs, PSDs of stresses, impact loads versus time histories, etc., are computed and compared with published values. There is a very good agreement between the present experimental/analytical results and other results published earlier for the motion response. It was found that the theoretical models tend to overestimate the structural response at short wave periods and underestimate it at long periods.

Copyright © 1987 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In