Effect of Column Spacing On Wave Force Considering Structure Motion

概要

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The study is of an offshore structure consisting of slender columns near the free surface and large buoyancy pontoons near the base that is moored to the sea bottom like a Tension Leg Platform. The effect of the spacing between the columns of the structure on the horizontal component of the total wave force due to an irregular wave has been investigated. Since the columns are slender, diffraction of the incident wave field has been neglected and the wave force has been computed using a method proposed by Borgman for an irregular wave. This research has been done to get an insight into the design of an offshore structure that will experience low horizontal force. The sea state considered is one having a significant wave height of 6m and a mean wave period of 6s since the probability of exceedance of this sea state is low in the west coast of India where the use of this structure is contemplated. The research presented in this paper is an extension to the research published by the author in the Journal of the Kansai Society of Naval Architects, Japan in September, 2001. The reseach paper of September, 2001 dealt with the wave force and the consequent optimum arrangement without considering the motion of the structure. In the present research, the motion of the structure has been considered and the wave force and the optimum spacing has been determined in this context.
2002-09-25