摘要
提出了基于系统可靠性理论的广义结构余度概念，探讨了单元初步损伤程度、载荷设置水平、单元强度差异系数等因素对系统综合失效概率相对及绝对界宽的影响，用实例计算说明在大型结构系统的方案设计阶段，以主模式失效概率初步评估系统综合失效概率的可行性和有效性。
In the stage of preliminary design of a large structural system such as aircraft, plateform,ship, compression vessel and e al, it is much important for selecting design plans to make in advance a rough estimate to the reliability grades of the differen design plans. In this paper, he concept of genera lized structural redundancy based on system reliability theory is suggested for defining the redundancy grade of complex sysems, and a type of approximate evaluation method of the global reliability of structural systems is established. A systematic analysis is made on the redundancy grade of some classical optimum structures using the new concept of generalized redundancy, and the phenomenon is found that the redundancy grade of the classical optimum structures is very low in terms of modern system reliability the ory. Loading level, elemental initial damage, variation coefficients of elemental strength and external loads have a significant effects on the reliability grade of structural systems, about which a systematic analysis is also made. The following conclusions are drawn that ① residual reliability as well as original reliability is an important property index, ② it is practical to use the failure probability of the main failure mode to valuate approximatively the redundancy grade of a large structural system.
出处
《强度与环境》
北大核心
1995年第2期60-65,共6页
Structure & Environment Engineering
基金
航空科学基金
博士后基金
关键词
结构可靠性
优化
可靠性计算
航空器
structural reliability, Optimization, Reliability calculation, Interval estimation
