论文部分内容阅读
根据结构可靠性分析理论和疲劳载荷对结构造成的损伤,建立了元件静强度和疲劳耦合可靠性分析的失效判别准则,给出了元件静强度失效时所对应的当量寿命,分析了元件静强度失效和疲劳失效之间的相互影响,进而讨论了结构系统静强度和疲劳的耦合可靠性分析方法。算例表明:在不同的使用年限内,静强度失效和疲劳失效对结构系统失效的贡献是不同的;在结构系统主要失效路径中既有元件静强度失效又有元件疲劳失效;若只考虑单一因素(或静强度、或疲劳)下的可靠性分析,可能会导致结构不安全。
According to the theory of structural reliability analysis and the damage caused by fatigue load to the structure, the failure criteria for the analysis of coupling reliability of fatigue strength and static strength are established. The corresponding equivalent lifetimes of the static strength failure are given. Failure and fatigue failure of the interaction between, and then discussed the structural system static strength and fatigue coupling reliability analysis method. The results show that the static strength failure and fatigue failure have different contribution to the failure of structural system during different service life. In the main failure path of the structural system, both the static strength of the existing components and the failure of the components are invalid. If only single Reliability analysis of factors (or static strength, or fatigue) can lead to structural insecurity.