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Effects of seismic wave propagation upon buried pipelines
Author(s) -
O'Rourke Michael J.,
Castro Gerardo,
Centola Naneen
Publication year - 1980
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290080507
Subject(s) - pipeline (software) , seismic wave , displacement (psychology) , curvature , wave propagation , pipeline transport , geology , rotation (mathematics) , seismology , structural engineering , engineering , geometry , physics , mathematics , optics , mechanical engineering , psychology , environmental engineering , psychotherapist
The behaviour of long straight buried pipelines subjected to seismic wave propagation is investigated. Well‐known relationships for determining upper bounds for the axial strain and curvature in the pipeline as well as relationships for relative displacement and rotation at the pipeline joints are discussed. The assumption that the seismic excitation can be modelled as a travelling wave having a shape which remains unchanged as it traverses the pipeline is examined in detail. It is shown that this assumption is unconservative when the effective propagation velocity of the seismic waves with respect to the pipeline is such that the actual time lag (separation distance between points divided by effective propagation velocity) is less than a ‘cross‐over’ time lag. Cross‐over time lags for 22 pairs of ground displacements recorded during the 1971 San Fernando Earthquake are presented in this paper. Finally, methods for estimating the propagation speed of the seismic waves along or with respect to the pipeline are discussed.