一种针对概率与非概率混合结构可靠性的敏感性分析方法

A Structural Reliability Sensitivity Analysis Method for Hybrid Uncertain Model with Probability and Non-probabilistic Variables

基于概率与非概率混合不确定模型,提出了一种用于不确定结构的可靠度敏感性分析方法。混合不确定模型中,使用随机分布描述不确定性变量,并给定某些关键分布参数变化区间而非精确值,通过混合可靠性分析方法,获得结构可靠性指标或失效概率区间。给出了六种敏感性指标,定量描述了可靠性区间对区间分布参数的敏感程度。该方法被用于一悬臂梁结构及一实际车门结构的可靠性分析中。

Based on hybrid uncertain model, a new reliability sensitivity analysis technique was de-veloped for uncertain structures. Random distributions were used to deal with the uncertainty, while some key parameters in the distribution functions were given variation intervals instead of precise val-ues. Hybrid reliability model was employed to evaluate the reliability degree of an uncertain structure based on the reliability index approach（RIA）. Six sensitivity indices were used for the sensitivity of the average reliability and reliability bounds with respect to the averages and widths of intervals. Equations of these sensitivity indices were derived. Two examples were used to demonstrate the accu-racy and effectiveness of the proposed method.