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Seismic hazard input for lifeline systems

Ronald T. Eguchi

Structural Safety

Cilt: 10, 193-198, 1991

The question of appropriate seismic hazard input for lifetime seismic risk analysis has been discussed extensively over the past several years. It is generally agreed that for large, underground lifeline systems, the following aspects of seismic hazard analysis are important:

1. Seismic hazard maps for lifeline analysis must consider the effects of ground failure, e.g., surface faulting, liquefactiOn, separately from the effects of strong ground motion alone.

2. These hazard effects must be mapped over large regions and in a form which will allow rapid scenario analysis.

Consideration of these factors may rule out the application of conventional seismic hazard maps, since these maps have typically been developed for single site facilities, such as buildings, and consider only the effects of strong ground shaking. Not only are other seismic hazards critical for lifeline assessment, but it is also essential to consider system performance, the results of many facilities being changed in single events.

In order to demonstrate the need for considering these factors, this paper proceeds with an examination of past earthquake experience of underground lifeline systems, a discussion of major problems and issues associated with seismic hazard analysis for lifelines, and finally, an identification of possible approaches for seismic hazard analysis of lifelines.

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