ANALYTICAL MODELLING OF BURIED PIPELINE RESPONSE UNDER SEVERE IMPOSED DEFORMATIONS

Abstract eng:
The main loads on buried pipelines are combinations of internal pressure, soil load, bending and normal force. Combinations of excessive soil loads and bending may occur in settlement areas and especially also due to landslides and seismic activity. Important failure modes are local buckling, severe ovalisation (flattening of the cross section) and rupture of the pipe wall. Likely places for rupture are at the local buckle and at the girth weld due to the combination of large plastic deformations and possible unfavourable material characteristics and discontinuities at the weld. Analytical models are presented to predict the elastic-plastic behaviour of pipelines under these load combinations: the bending moment curvature diagram, the curvature ovalisation diagram, curvature strain diagrams. The parameters that have an influence on local buckling are discussed and quantified where possible. The outcome of the models is compared with test results and FEA results from literature and recent research projects.

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