基于随机有限元法空间梁板结构系统可靠性分析

飞行器工作环境复杂，影响其结构安全的不确定因素很多，并且结构失效会造成巨大的经济损失，甚至危及生命，所以对其进行结构可靠性分析是非常必要的。为了使可靠性指标计算简化，现有文献主要采用杆板结构来模拟飞行器的空间结构，并且主要基于有限元来求可靠性指标。本文采用空间梁元与加筋板格元（SP）来模拟其三维空间结构，模型更符合实际模型。同时考虑材料的强度、梁元件截面积、板元件厚度和外载荷均为随机变量，采用随机有限元法分析了随机变量对结构节点位移的影响，并应用可靠性基本理论对该结构系统进行结构可靠性分析。最后编制了相应的软件，计算了两个算例，结果证明该方法对飞行器结构可靠性分析具有重要的作用。

Structural Reliability for spatial Girder-Panel Structure Based on SFEM

Structural reliability analysis for aircrafts is necessary for their complex working environment and their terrible results if the structure lapses.In this paper,Spatial girder element and SP panel element are used to model the three dimension spatial aircrafts structure which is more fit for real structure than traditional model to calculate reliability index.Considered the material intensity,girder section area,panel thickness and loads as stochastic variables.stochastic finite element is adopted to analyze the influence of stochastic variables to the nodal displacement.Structural reliability principle is used to evaluate the structure system reliability analysis.Software is developed to implement this theory and is applied to two numerical samples.