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Impacts of Environmental Loads on a Jack-up Offshore Structure

Aghdamy, Sanam (2008) Impacts of Environmental Loads on a Jack-up Offshore Structure. UNSPECIFIED. (Unpublished)

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Abstract

Due to natural depletion of oil/gas reserves in shallow water depths and also continually increasing the demand for producing these natural resources, steadily more emphasis has been given to design Jack-up structures that can be used in deeper water as well as harsher environment with longer operational periods. This final year project aimed to investigate the impacts of environmental loads (caused by wave, wind and current) on the major reactions (total base shear force and overturning moment) of a typical jack-up offshore platform. In order to perform this research, two real-life jack-up structures were selected and analyzed using SACS structural analysis package. The first selected jack-up structure is called West Prospero which is located at Malaysia's Jerneh and Tapis fields, off the east coast of peninsular Malaysia and the second structure is called MSL model which is designed for Central North Sea environmental condition. To ensure a sound application of the commercial software (SACS), a simple in house computer program facilitating the manual calculations of the total base shear was developed. Toward verifying the analysis outcomes and better understanding of the way in which offshore structures react to environmental forces, some laboratory experiments were carried out on scaled physical model of West Prospero. Given the large approximations involved, the comparison of the experimental results with the computerized calculations showed acceptable similarity for the base shear. The results of sensitivity analysis revealed that the majority of base shear and overturning moment is caused by wave forces. It was shown that the shear force is more sensitive to wave height than to other wave parameters or to diameter of members. However, for the overturning moment the dominant parameter could be wave height or wave period depending on the range of the relative change of the respective factors. The relative increase of members' diameter brings about a low relative change in the overturning moment but a high change in the base shear.

Item Type: Final Year Project
Subject: UNSPECIFIED
Divisions: Engineering > Civil
Depositing User: Users 5 not found.
Date Deposited: 05 Jun 2012 08:38
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/2959

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