Inelastic Behaviors of Pipelines Buried Through Liquefiable Zone

by Yaw-Heui Yeh, Natl Taiwan Inst of Technology, Taipei, Taiwan,
Ching-Ming Wang, Natl Taiwan Inst of Technology, Taipei, Taiwan,

Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering


For the case of a major pipeline transmission system buried through in soil deposits that may be susceptible to liquefaction, its seismio environments can be considered in the following manner. In the liquefiable zone, the seismic waves propagating faster through firm soils along the pipe axis cause an incoherent movement at both edges of the pipe submerged in liquefied mediums. Therefore, a buried pipe through the liquefied area is subjected to seismic incoherent motions which generate longitudinal and lateral forces. Although there are many investigators had done some researches to study the performances of pipelines buried through soil liquefiable zone during seismic shaking, the concentration is mostly confined to the extent of elastic behaviors of pipelines under the adverse environments of soil liquefaction. The objective of this paper is to investigate the inelastic behaviors of pipelines buried through a liquefiable soil region by using finite element method. In addition, both Wilson-θ method and Newton-Cotes Integration are also employed as the other essential tool to study pipe performances during analyses. The resulting data show that the inelastic behaviors of buried pipe inside the liquefied zone will cause the deduction of 30-40% from the buckling strength of the pipe.

Subject Headings: Buried pipes | Soil-pipe interaction | Seismic effects | Inelasticity | Soil strength | Pipes | Seismic waves | Soil liquefaction

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