International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP) (12th : 2015)

Response of buried pipes taking into account seismic and soil spatial variabilities Elachachi, Sidi Mohammed; Yanez-Godoy, Humberto


Heavy damage to pipelines has occurred in many strong earthquakes. Because pipes extend over long distances parallel to the ground, their supports undergo differential motions during an earthquake. Furthermore the soil spatial variability and the soil-pipe interaction contribute to the appearance of additional stresses and deformations. Herein, a frequency domain spectral analysis for obtaining the response of pipes to correlated or partially correlated non stationary random ground motion and spatially random soil is presented. The space-time variability of the ground motions and of the soil spatial variability are modeled following a stochastic description through random process (fields) and spectral analysis. The key results are that soil heterogeneity induces significant effects (differential settlements, bending moments, counter-slopes) that cannot be predicted if soil homogeneity is assumed. The spatial variation of the ground motion could increase locally the structural response depending on the soil-structure interaction and the pipe-joint stiffness ratio in segmented pipes.

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