The challenge of numerically implementing numerous force–resultant models in the stability analysis of long on-bottom pipelines

Plasticity models written directly in terms of force and displacement are finding increased popularity in describing the behaviour of offshore foundations. However, when applied to the on-bottom stability analysis of pipelines under random storm loading, hundreds, if not thousands, of models must be...

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Bibliographic Details
Published in:	Computers and geotechnics Vol. 37; no. 1; pp. 216 - 232
Main Authors:	Tian, Yinghui, Cassidy, Mark J.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01.01.2010
Subjects:	Explicit and implicit scheme Integration algorithm Mixed hardening Pipe–soil interaction Two-surface model Mixed hardening Integration algorithm Explicit and implicit scheme Two-surface model Pipe–soil interaction
ISSN:	0266-352X, 1873-7633
Online Access:	Get full text
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Summary:	Plasticity models written directly in terms of force and displacement are finding increased popularity in describing the behaviour of offshore foundations. However, when applied to the on-bottom stability analysis of pipelines under random storm loading, hundreds, if not thousands, of models must be incorporated with structural elements in a three-dimensional analysis and simultaneously solved. This necessitates extremely efficient and accurate numerical integration techniques. This paper scrutinizes constitutive integration algorithms within both explicit and implicit frameworks, and applies them to a two-surface mixed hardening model that describes the force–displacement behaviour of a pipe partially embedded in sand. Detailed solutions are provided, allowing implementation of the pipe–soil model into any standard structural finite-element program. Through use of practical examples, the efficiency and accuracy of the solution methods are assessed.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0266-352X 1873-7633
DOI:	10.1016/j.compgeo.2009.09.004