基于强度退化分析的结构非概率动态可靠性模型

摘要

Adequate original data are necessary for using probabilistic reliability model and fuzzy reliability model to analyze the structural reliability. To make use of the uncertain information of structures, the static strength and the applied load are described as interval variables. Based on residual strength degradation model, the residual strength degradation interval model is presented. The computational method of non-probabilistic time-dependent reliability index and failure rate are established with times of load action changing when the structural life is measured by times of load action. A numerical example has been used to illustrate the proposed method. The results show that the proposed method is feasible and effective for structural reliability analysis and failure rate prediction.%在对结构进行可靠性分析时，概率可靠性模型和模糊可靠性模型对于原始数据信息的要求较高。为了充分利用不确定性信息弥补原始数据的不足，将材料的静强度和所受的载荷用区间变量来描述，基于材料的剩余强度退化模型，提出了剩余强度退化的区间模型，建立了结构随栽荷作用次数而变化的非概率动态可靠性指标及其失效率的计算方法。通过实例的计算和分析，表明了该方法对结构可靠性分析及其失效率的预测是可行、有效和合理的。