某型舰船危险部位结构可靠性分析

摘要

在响应面随机有限元法和结构可靠性理论的基础上，利用有限元软件 Ansys建立某型舰船开口结构的梁板模型，采用改进的一次二阶矩法与分枝限界法、概率网络评估技术分析了开口结构在组合载荷作用下的可靠性。以结构的最危险点应力为输出变量，通过敏度分析忽略最大应力不敏感的变量拟和响应面方程。利用随机有限元和 CAE软件结合开展结构系统的可靠性研究，避免了大型结构寻找失效模式的困难，使可靠性分析的效率得到极大提高。%The girder and plane model of a naval ship is established based on the stochastic finite element of response surface and the theory of structure reliability. Adapted first-order second-moment methodadvanced branch-and-bound method and PNET method are used to do reliability analysis for the opening structure system. The reliability of the opening structure in the ship is analyzed on the combined loads. This method can avoid difficulty of looking for significant failure modes by using the stochastic finite element method and CAE software.