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Title: A parametric study on the local buckling response of pipelines under combined-loading conditions
Category: Technical papers from the Journal of Pipeline Integrity
Downloadable: Yes 
Catalog No.: 2095
Date of Publication: December, 2006
Price: $25.00 US
Authors: A Fatemi, S Kenny , N Cheraghi, and F Taheri
Abstract: THE EXPLORATION and development of new hydrocarbon resources has been pushed to frontier regions that may encounter permafrost terrain and ice environments. Pipelines are a practical and cost-effective transportation system to bring oil and gas resources from these remote locations. A major design consideration is the effect of large-deformation ground-movement events such as frost heave, thaw settlement, and ice gouging on the mechanical integrity of buried pipelines.

The effects of internal product pressure and geotechnical loads, due to thermal expansion and relative ground deformation, impose combined loading conditions on buried pipelines. Large-deformation combined-loading events may result in local buckling and wrinkling mechanisms that may impair pipeline operational requirements or strength criteria. Establishing design criteria that define serviceability or ultimate limit states provides an engineering framework to assess mechanical integrity for unique design conditions.

A comprehensive parametric study was conducted using the finite-element method to assess the effects of diameter to wall thickness ratio, internal pressure, axial load, end moment, and geometric imperfections on the local buckling response of pipelines subject to combined loads. The limit point from the global pipeline moment curvature response was evaluated. The key factors influencing the peak moment amplitude and curvature to peak moment were examined.

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