半潜式海洋平台整体结构的三维可靠性分析

本文将半潜式海洋平合模型化为空间刚架结构系统，导出三维刚架梁元在塑性阶段的修正刚度矩阵和等效节点力，并有效地改进了分枝眼界法，开发出通用于平面和立体结构系统的可靠性分析程序，对平台整体结构进行可靠性估算。通过算例，验证了方法和程序的可靠性和通用性。

THREE-DIMENSIONAL RELIABILITY RESEARCH OF OVER-ALL STRUCTURE FOR SEMI-SUBMERSIBLE OFFSHORE PLATFORMS

In this paper, the reduced stiffness matrixes and the equivalent nodal forces of a three-dimensional frame at the plastic stage are deduced and a general programme to analyze the reliability of two- and three-dimensional structures is developed using a three-dimensional frame structural system to model or to idealize the semi-submersible platform.The branch-and-bound method is also improved significantly. Structral system reliability analyses are carried out through a calculated example, which verify the reliability and thegenerality of the proposed method and the programme.