| System Reliability Analysis of Offshore Strctures and Component Safety Rank Assessment |
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| 摘 要： | Offshore structures will encounter serious environmental load,so it is important to study thestructural system reliability and to evaluate the structural component safety rank.In this paper,thebracnch-and-bound method is adopted to search the main failure path,and the Ditlevsen bound method isused to calculate the system failure probability.The structure is then assessed by the fuzzy comprehensiveassessment method,which evaluates the structural component safety rank.The ultimate equation of the tu-bular cross-section is analyzed on the basis of ultimate stregnth analysis.The influence of effectcoefficients on the structural system failure probability is investigated,and basic results are obtained.Ageneral program for spatial frame structures by means of the above method is developed,and verified bythe numerical examples.
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System Reliability Analysis of Offshore Strctures and Component Safety Rank Assessment |
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| Authors: | YANG Zhiyong and XIAO Xi Lecturer School of Naval Architecture and Ocean Engineering Shanghai Jiaotong University |
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| Abstract: | Offshore structures will encounter serious environmental load, so it is important to study the structural system reliability and to evaluate the structural component safety rank. In this paper, the bracnch-and-bound method is adopted to search the main failure path, and the Ditlevsen bound method is used to calculate the system failure probability. The structure is then assessed by the fuzzy comprehensive assessment method, which evaluates the structural component safety rank. The ultimate equation of the tubular cross- section is analyzed on the basis of ultimate stregnth analysis. The influence of effect coefficients on the structural system failure probability is investigated, and basic results are obtained. A general program for spatial frame structures by means of the above method is developed, and verified by the numerical examples. |
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| Keywords: | structural system reliability branch-and-bound method fuzzy comprehensive assessment safety rank offshore structure platform |
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