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《中国海洋工程(英文版)》 2008-02
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Efficient Approximate Method of Global Reliability Analysis for Offshore Platforms in the Ice Zone

LI Gang a, 1, ZHANG Da-yong a, YUE Qian-jin a and Eric C. Spurgeonba State Key Laboratory of Structural Analysis of Industrial Equipment,Dalian University of Technology, Dalian 116024, China bDepartment of Civil and Environmental Engineering, University of Florida,Gainesville, FL 32612, USA  
Ice load is the dominative load in the design of offshore platforms in the ice zone, and the extreme ice load is the key factor that affects the safety of platforms. The present paper studies the statistical properties of the global resistance and the extreme responses of the jacket platforms in Bohai Bay, considering the randomness of ice load, dead load, steel elastic modulus, yield strength and structural member dimensions. Then, based on the above results, an efficient approximate method of the global reliability analysis for the offshore platforms is proposed, which converts the implicit nonlinear performance function in the conventional reliability analysis to linear explicit one. Finally, numerical examples of JZ20-2 MSW, JZ20-2NW and JZ20-2 MUQ offshore jacket platforms in the Bohai Bay demonstrate the satisfying efficiency, accuracy and applicability of the proposed method.
【Fund】: This work was financially supported by the National High Technology Research and Development Programof China(863Program Grant No.2001AA602015);; the National Natural Science Foundation of China(Grant No.50578028and No.10721062);; the Programfor NewCentury Excellent Talents in University.
【CateGory Index】: P75
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