结构可靠性分析中灵敏度因子研究的新方法

New Method on Calculating Sensitivity Factors

对传统灵敏度因子进行了探讨，研究了结构可靠性分析中计算灵敏度因子的各种方法，并提出了新的灵敏度计算方法，建议用灵敏矢量来反映结构各因素对结构失效影响的大小．用理论和实例说明了新方法的可行性和合理性．文中提出的灵敏度因子计算方法不仅适合于单模态失效的可靠性分析，而且也适用于多模态失效的结构可靠性分析，其研究结果具有较大的理论和实践意义．

Various traditional methods on calculating sensitivity factors are extensively discussed. Based on those studies, a new method on calculating sensitivity factor is suggested. It is suggested that a vector instead of a single number is used to represent the sensitivity of a variable. Through a simple example, it is demonstrated that this new representation is more reasonable than the traditional definitions. The new method can be used not only in the structure with a single failure mode, but also in the structure with system failure mode. This paper illustrates the potential of using such new method of calculating sensitivity factor in design decisions and making process on structure.