Reliability Analysis of Lifeline Systems

by Hideji Kawakami, Research Assoc. of Construction Engrg.; Saitama Univ., 255 Shimo-Okubo Urawa, 338 Japan,


Serial Information: Journal of Technical Topics in Civil Engineering, 1983, Vol. 109, Issue 2, Pg. 117-131

Document Type: Journal Paper


Considering that most of the lifeline systems are composed of a few kinds of many structures, the reliability of the system is represented by the use of two functions, one pertaining to the reliability of the structures, and the other pertaining to the system configuration and redundancy. The former function is calculated by the use of the reliability of each kind of structure, which is effected by the external force and resisting capacity of structures. The latter function has nothing to do with the external force nor the resisting capacity of the structure and is an eigen function that depends on the configuration of the system and also depends on the safety criterion of the system. By the use of these two functions, an economical method to evaluate the reliability of the system is derived. Then, for the case that these two functions can be assumed to be the Gaussian distributions, a simple method to compute the reliability of the system is developed. For the system composed of only one kind of structures, a safety index is proposed.

Subject Headings: System reliability | Structural reliability | System analysis | Structural analysis | Lifeline systems | Structural safety | Economic factors | Gaussian process

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