随机导管架平台结构动力可靠性及灵敏度分析

摘要

A method based on the Kriging model and FORM is presented for dynamic reliability analysis on jacket offshore structures with parameter uncertainties.Firstly the dynamic reliability of the structures with random parameter expression is built according to the first passage failure, then ANSYS procedure is used to obtain the approximation Kriging model of implicit performance function and the reliability index.Finally according to the sensitivity formula of the reliability respect to the mean and standard variance of random variables, the reliability sensitivity of offshore structures respect to variables is analyzed and some useful conclusions are obtained.%基于Kriging模型和一次二阶矩方法对具有随机参数的导管架平台结构动力可靠度进行了分析.首先根据首次超越破坏准则建立了随机结构动力可靠度的隐式功能函数表达形式.然后通过有限元分析得到用于隐式功能函数近似的Kriging模型,进而求得可靠度指标.最后根据可靠度对随机参数均值和标准差的灵敏度公式,分析了导管架平台可靠度对各随机变量的敏感性,并得出了一些有益于工程设计、参数优化和精度控制的结论.