Polar and Arctic Engineering

Life-Cycle Cost-Effective Optimum Design of Ice-Resistant Offshore Platforms

[+] Author and Article Information
Gang Li1

State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian, 116023, Chinaligang@dlut.edu.cn

Dayong Zhang, Qianjin Yue

State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian, 116023, China


Corresponding author.

J. Offshore Mech. Arct. Eng 131(3), 031501 (May 29, 2009) (9 pages) doi:10.1115/1.3124138 History: Received April 02, 2007; Revised January 05, 2009; Published May 29, 2009

In China, the oil and natural gas resources in Bohai Bay are mainly marginal oil fields, which freeze in the winter. It is necessary to build both ice-resistant and economical offshore platforms. However, risk is involved in the design, construction, utilization, and maintenance of offshore platforms as uncertain events may occur within the life-cycle of a platform. In this paper, the optimum design model of the expected life-cycle cost for ice-resistant platforms based on the cost-effectiveness criterion is proposed. Multiple performance demands of the structure, facilities and crew members, associated with the failure assessment criteria and evaluation functions of costs of construction, consequences of structural failure modes including damage, revenue loss, death, and injury, as well as discounting cost over time are considered. Different reliability analysis approaches involved in life-cycle cost evaluation, such as the global reliability under the extreme ice load, the dynamic reliability, and fatigue life induced by ice vibration, are studied. The proposed life-cycle optimum design formulas are applied to a typical ice-resistant platform in Bohai Bay, and the results demonstrate that the life-cycle cost-effective optimum design model is more rational compared with the conventional static design and the optimum dynamic design.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Global resistance model of offshore platforms

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Figure 2

Failure probabilities of different damage levels under the extreme static ice load

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Figure 3

Failure probabilities of different damage levels (crew members/facility) under the dynamic ice load

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Figure 4

Time-dependent fatigue life of various deterioration functions

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Figure 5

Costs versus structural global stiffness in the service life



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