含缺陷结构非概率可靠性分析方法研究

Non-probabilistic Reliability Analysis of Defect Structure

将基于分段描述的结构非概率可靠性模型引入含缺陷结构的可靠性分析,结合断裂判据,并用分段描述模型刻画未确知变量,实现了非概率的断裂力学分析,克服了概率断裂力学方法对原始数据要求高的局限和未确知信息区间均匀分布模型过于保守的缺陷,有效解决了含裂纹结构在小样本、贫信息场合的可靠性评定问题。通过算例,对文中方法的可行性和有效性进行了验证。

In this paper,the structural non-probabilistic reliability model based on fragment description is introduced to fracture structure reliability analysis.Combining the fracture criterion and fragment description,the non-probabilistic fracture mechanics analysis is realized.The limitation of probabilistic fracture mechanics in solving the problem of small sample is overcome.The over conservation of interval uniform distribution for unascertained information is also overcome.The reliability problem of fracture structure with small sample is resolved.The feasibility and reasonableness of the method is proved through a given example.