Infinitely long buried pipelines under bending and internal pressure

Gantes, CJ; Gerogianni, DS

dc.contributor.author	Gantes, CJ	en
dc.contributor.author	Gerogianni, DS	en
dc.date.accessioned	2014-03-01T01:51:53Z
dc.date.available	2014-03-01T01:51:53Z
dc.date.issued	2002	en
dc.identifier.issn	03043622	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26497
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0041940282&partnerID=40&md5=429f987979a2855d8070745238a150c6	en
dc.subject	Bending Moment	en
dc.subject	Brazier Effect	en
dc.subject	Buried Pipelines	en
dc.subject	Infinite Length	en
dc.subject	Internal Pressure	en
dc.subject	Ovalization	en
dc.subject.other	Bending (deformation)	en
dc.subject.other	Bifurcation (mathematics)	en
dc.subject.other	Buckling	en
dc.subject.other	Loads (forces)	en
dc.subject.other	Pressure effects	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Strain	en
dc.subject.other	Stress analysis	en
dc.subject.other	Structural analysis	en
dc.subject.other	Underground structures	en
dc.subject.other	Buckling loads	en
dc.subject.other	Pipeline bends	en
dc.title	Infinitely long buried pipelines under bending and internal pressure	en
heal.type	journalArticle	en
heal.publicationDate	2002	en
heal.abstract	The bending behavior of long cylinders with deformable cross-sections is associated with a nonlinear phenomenon, called the Brazier effect. The nonlinear response is induced by ovalization of the originally circular cross-section, which, in turn, decreases the moment of inertia and leads to a nonlinear moment-curvature relation. In addition, the deformation of the cross-section increases the axial bending stresses and lowers the structure's local buckling load. Thus, reliable design of such structures should include consideration of the Brazier effect on two possible failure modes, namely limit point buckling along the moment-curvature diagram or local buckling bifurcation. For buried pipelines ovalization is partly hampered by the surrounding soil, which provides resistance to parts of the pipe cross-section that tend to deform outwards. In this paper approximate analytical expressions for the Brazier limit moment and the local buckling moment are derived, depending on the stiffness of the surrounding soil, modeled with linear radial translational springs. The nonlinear moment-curvature relation is obtained through energy considerations, with an additional term representing the strain energy of the soil springs. Parametric studies describe the effect of different soil types. The effects of finite length and axial force are described in a companion paper.	en
heal.journalName	Journal of the International Association for Shell and Spatial Structures	en
dc.identifier.volume	43	en
dc.identifier.issue	139	en
dc.identifier.spage	101	en
dc.identifier.epage	113	en