ULTIMATE STRENGTH AND RELIABILITY ASSESSMENT FOR THE SHIP HULL GIRDERS USED IN THE ISSC-2000 BENCHMARK STUDY
H-H Sun, Yan Bai
Abstract
H-H Sun, Yan Bai
Abstract
This paper describes how the structural failure of ship hull girders because of extreme bending moments is the most catastrophic event. It deals with the ultimate strength and reliability of the hull girders that have been used in the benchmark study by the ISSC 2000 Committee V1.2. A simplified method is proposed based on the Smith method in order to calculate the progressive collapse of the hull girders. An ultimate strength equation is suggested and compared with the prediction of the present simplified method and another method is applied to assess the reliability of the hull girders of bulk carriers, containerships, double hull VLCC tankers and single hull VLCC tankers. The method accounts for time dependent degradation effects of corrosion and fatigue. Time-variant reliability of the hull girder is quantified using the proposed reliability method.
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This paper describes how the structural failure of ship hull girders because of extreme bending moments is the most catastrophic event. It deals with the ultimate strength and reliability of the hull girders that have been used in the benchmark study by the ISSC 2000 Committee V1.2. A simplified method is proposed based on the Smith method in order to calculate the progressive collapse of the hull girders. An ultimate strength equation is suggested and compared with the prediction of the present simplified method and another method is applied to assess the reliability of the hull girders of bulk carriers, containerships, double hull VLCC tankers and single hull VLCC tankers. The method accounts for time dependent degradation effects of corrosion and fatigue. Time-variant reliability of the hull girder is quantified using the proposed reliability method.
Key concepts: Hull, Girder, Structural engineering, Reliability (semiconductor), Engineering, Benchmark (surveying), First-order reliability method, Bending