A Method for the Analysis of Seismic Reliability of Lifeline Systems
Mohammadi, Jamshid
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https://hdl.handle.net/2142/66876
Description
Title
A Method for the Analysis of Seismic Reliability of Lifeline Systems
Author(s)
Mohammadi, Jamshid
Issue Date
1980
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Geological Survey
Engineering, Civil
Energy
Language
eng
Abstract
Methods for assessing the seismic safety of a lifeline system, such as a water distribution system, an oil pipeline system, or a transportation network, are developed and introduced; with part of the study being devoted to the development of a relation between the earthquake intensity and the distance.
The attenuation of maximum ground motion intensity with distance is examined, with emphasis on the motions in the near-source regions. The study is based on the analytical calculation of wave propagations in an elastic half-space subjected to a plane of rupture at a given depth. Specific attenuation relations are then developed to be applied in the seismic safety analysis of lifeline systems, in particular, and seismic risk analysis of close-in regions, in general. The earthquake magnitude is related empirically to the source parameters. On this basis, the importance of the source parameters are examined including the effects of the rupture width, the inclination of the rupture plane, and the depth of the rupture from the surface.
With regard to the safety analysis of lifeline systems, it is assumed that: (i) earthquakes originate as ruptures along geologic faults, (ii) the rupture length is a function of the earthquake magnitude; and (iii) the occurrences of future earthquakes constitute a Poisson process.
Two types of hazards from earthquakes are considered; namely, the hazard of a fault-rupture strike on the links of a lifeline system, and the hazard of damage caused by severe ground shaking.
The specific application and contributions of the methods presented herein are then demonstrated for the seismic reliability analyses of two lifeline systems.
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