American Society of Civil Engineers

Analytical Fragility Relation for Buried Segmented Pipe

by Michael O’Rourke, (Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy N.Y. 12180-3590 E-mail:

pp. 1-10, (doi:

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Document type: Conference Proceeding Paper
Part of: TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment
Abstract: An analytical fragility relation for seismic damage to segmented pipe is presented. The relation is based upon a simplified mechanistic model with rigid pipe segments and flexible joints, subject to ground strain parallel to the pipeline longitudinal axis. As such it is applicable to both wave propagation and PGD hazards. In the model, ground strain is accommodated by opening of the pipeline joints. That is, the current model considers tensile ground strain only. The results for small diameter cast iron pipe subject to tensile ground strain match the empirical observation (repairs per kilometer) quite well for roughly an order of magnitude of ground strain. It is felt that the current model provides a good starting point for analytical models applicable to other diameters and pipe material as well as all levels of both tensile and compressive seismic ground strains.

ASCE Subject Headings:
Buried pipes
Seismic analysis