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工程力学  2013 

结构可靠性灵敏度因子的一种新指标

DOI: 1000-4750(2013)06-0016-06, PP. 16-21

Keywords: 可靠性,灵敏度因子,可靠指标,分布参数,二阶矩法,可靠性,灵敏度因子,可靠指标,分布参数,二阶矩法

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Abstract:

通过对可靠性灵敏度的分析和推导,利用灵敏度标准差值构造了一种新的可靠性灵敏度因子。与传统灵敏度因子不同的是,新因子不仅能反映各随机变量对结构失效概率影响的重要性程度,因子的数值大小还能表征将单个变量作为确定性变量处理或将多个变量同时作为确定性量处理时所引起的可靠指标误差大小。据此结论,采用新灵敏度因子进行灵敏度分析时,只需要进行一次分析就能识别出各随机变量对结构失效整体影响的有益信息,可以有效地提高计算效率,降低分析难度。利用数值算例验证说明了所提可靠性灵敏度因子指标的有效性。

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