System reliability analysis of offshore structures and component safety rank assessment

作者：Yang, ZY^*; Xiao, X

来源：China Ocean Engineering, 1998, 12(2): 173-181.

• structural system reliability
• branch-and-bound method
• fuzzy comprehensive assessment
• safety rank
• offshore structure
• platform

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 branch-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.

• 出版日期1998
• 单位上海交通大学