Safety Assessment of Welded Pipelines Undergoing Large Ground Deformation

by Nobuhisa Suzuki, NKK Corp, Technical Research Cent, Japan,
Akira Hagio, NKK Corp, Technical Research Cent, Japan,

Document Type: Proceeding Paper

Part of: Pipeline Design and Installation


Spatial distribution and modelling of liquefaction induced permanent large ground deformation are presented. The permanent large ground displacement patterns required for the safety assessment of buried pipelines are idealized on the basis of case history information of the 1964 Niigata Earthquake and the 1983 Nihonkai Chubu Earthquake. The idealized patterns are simply presented as function of spatial extent of longitudinal transient zone, lateral spreading zone and ground settlement and the maximum displacements. The margin of safety of the continuous buried pipelines of 12- and 24-in. outside diameters subject to the permanent ground deformation are demonstrated in comparisons with the local buckling strength of the pipes.

Subject Headings: Safety | Welding | Pipelines | Soil deformation | Spatial distribution | Case studies | Soil settlement | Ground motion

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