Torsional buckling of vertical risers

Katsaounis, GM; Papazoglou, VJ

dc.contributor.author	Katsaounis, GM	en
dc.contributor.author	Papazoglou, VJ	en
dc.date.accessioned	2014-03-01T02:48:46Z
dc.date.available	2014-03-01T02:48:46Z
dc.date.issued	1999	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34100
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0033237918&partnerID=40&md5=8a6749bad5bf9ad74758d60b7314ffb0	en
dc.subject	Airy functions	en
dc.subject	Buckling	en
dc.subject	Gravity	en
dc.subject	Risers	en
dc.subject	Torsion	en
dc.subject.other	buckling	en
dc.subject.other	conference proceeding	en
dc.subject.other	gravity	en
dc.subject.other	riser	en
dc.subject.other	torsion	en
dc.subject.other	buckling	en
dc.subject.other	conference proceedings	en
dc.subject.other	gravity	en
dc.subject.other	pipe	en
dc.subject.other	torsion	en
dc.subject.other	Boundary conditions	en
dc.subject.other	Buckling	en
dc.subject.other	Differential equations	en
dc.subject.other	Functions	en
dc.subject.other	Graph theory	en
dc.subject.other	Mathematical models	en
dc.subject.other	Nonlinear equations	en
dc.subject.other	Stiffness	en
dc.subject.other	Structural analysis	en
dc.subject.other	Torque	en
dc.subject.other	Torsional stress	en
dc.subject.other	Airy functions	en
dc.subject.other	Nonlinear equilibrium equations	en
dc.subject.other	Torsional buckling	en
dc.subject.other	Marine risers	en
dc.title	Torsional buckling of vertical risers	en
heal.type	conferenceItem	en
heal.publicationDate	1999	en
heal.abstract	In this paper the problem of buckling of vertical risers due to an applied torque is solved. The vertical riser is modelled as a column, having axial, flexural and torsional stiffness. The column is subjected to gravity, hydrostatic loading, tension and a torsional moment. The general non-linear equilibrium equations are linearized around the vertical configuration and a system of coupled differential equations having variable coefficients is derived. A solution, expressed in terms of Airy functions, is found. Graphs of the critical torque, plotted against the length of the riser and the effective tension at the bottom, are presented. Several boundary conditions at the end of the riser are examined. The influence of the low bending stiffness of the structure is discussed and closed form asymptotic formulae are derived for this case. These results are compared against numerically obtained data using the Finite Element method.	en
heal.publisher	International Society of Offshore and Polar Engineers	en
heal.journalName	Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference	en
dc.identifier.spage	248	en
dc.identifier.epage	254	en