RESEARCH PAPERS: Offshore Mechanics

Structural Responses and Design Waves of Semisubmersibles

[+] Author and Article Information
T. Suhara

Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan

K. Yoshida

Dept. of Naval Architecture, The University of Tokyo, Tokyo, Japan

T. Yoneya

Offshore Technology Section, Nippon Kaiji Kyokai, Tokyo, Japan

J. Offshore Mech. Arct. Eng 111(1), 12-21 (Feb 01, 1989) (10 pages) doi:10.1115/1.3257132 History: Received January 01, 1986; Revised October 07, 1988; Online October 30, 2009


This paper presents the results of comparative calculations on structural responses of a typical semisubmersible and the discussion on design waves for brace stresses. A typical semisubmersible of two-lowerhull type is adopted as a full-scale model for the comparative calculations on three-dimensional motion and structural responses. Based on the comparative calculations by eight different computer programs, standard response functions are proposed as to axial and bending stresses of major braces. Characteristic wave loading patterns, which correspond to design waves, are proposed based on the standard stress response functions. Also simplified equations of wave forces on semisubmersibles, which are useful to consider design waves, are derived based on the assumptions of taking account of only hydrodynamic inertial forces. Based on these results, maximum brace stresses during a 100-yr return period are estimated using design wave method, and are compared with statistically estimated values by short-term and long-term predictions. As a result, it is found that design wave method has a tentative ground for practical design of semisubmersibles.

Copyright © 1989 by ASME
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