Flexible risers are complex structures composed of several concentric polymeric and steel armor layers that withstand static and dynamic loads applied by the floating production vessel and by the ocean environment. Determining the response of these structures when subjected to axisymmetric loadings (i.e., any combination of traction, torsion, and internal or external pressures) is an important task for the local structural analysis since it provides probable values for the loading distribution along the layers and, thus, allowing estimating the expected life of a riser using fatigue tools. Although finite element models have been increasingly used to accomplish this task in the last years, the simplicity and the reasonable accuracy provided by analytical models can be seen as reasons that justify their continued use, at least in the initial cycles of the design. However, any analytical model proposed for such a task must be checked with well-conducted experimental results in order to be considered as an acceptable analysis tool. The aims of this article are twofold: (i) to present the main results of experimental tests involving both internal pressure and traction loadings on a 63.5 mm (2.5 in.) flexible riser, carried out at the Institute for Technological Research of São Paulo (IPT), which can be used as a means of checking finite element or analytical models proposed by other researchers, and (ii) to compare some results obtained experimentally with those predicted by an analytical model which can also include any combination of axisymmetric loadings. Besides presenting full data concerning the internal structure of the riser, the experimental procedures used to perform the tests and the main results (e.g., Force × Displacement curves) are also presented. A brief discussion about the validity of some hypotheses that are usually assumed by analytical models found in the technical literature is made.
Skip Nav Destination
Article navigation
February 2014
Research-Article
Some Further Studies on the Axial–Torsional Behavior of Flexible Risers
Roberto Ramos, Jr.,
Clóvis A. Martins,
Celso P. Pesce,
Celso P. Pesce
e-mail: ceppesce@usp.br
Mech. Eng. Department,
University of São Paulo–Escola Politécnica
,Mech. Eng. Department,
05508-970, Av. Prof. Mello Moraes 2231
,São Paulo
, Brazil
Search for other works by this author on:
Francisco E. Roveri
Francisco E. Roveri
Petrobras– CENPES,
e-mail: roveri@petrobras.com.br
21941-915, Av. Horácio Macedo, 915
,Rio de Janeiro
, Brazil
e-mail: roveri@petrobras.com.br
Search for other works by this author on:
Roberto Ramos, Jr.
e-mail: rramosjr@usp.br
Clóvis A. Martins
e-mail: cmartins@usp.br
Celso P. Pesce
e-mail: ceppesce@usp.br
Mech. Eng. Department,
University of São Paulo–Escola Politécnica
,Mech. Eng. Department,
05508-970, Av. Prof. Mello Moraes 2231
,São Paulo
, Brazil
Francisco E. Roveri
Petrobras– CENPES,
e-mail: roveri@petrobras.com.br
21941-915, Av. Horácio Macedo, 915
,Rio de Janeiro
, Brazil
e-mail: roveri@petrobras.com.br
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 14, 2010; final manuscript received September 2, 2013; published online November 12, 2013. Assoc. Editor: Pingsha Dong.
J. Offshore Mech. Arct. Eng. Feb 2014, 136(1): 011701 (11 pages)
Published Online: November 12, 2013
Article history
Received:
September 14, 2010
Revision Received:
September 2, 2013
Citation
Ramos, R., Jr., Martins, C. A., Pesce, C. P., and Roveri, F. E. (November 12, 2013). "Some Further Studies on the Axial–Torsional Behavior of Flexible Risers." ASME. J. Offshore Mech. Arct. Eng. February 2014; 136(1): 011701. https://doi.org/10.1115/1.4025541
Download citation file:
Get Email Alerts
Numerical Modeling of Fish Cage Structural Responses in Regular and Irregular Waves Using Modified XPBD
J. Offshore Mech. Arct. Eng (April 2025)
Layout Optimization of Wave Energy Park Based on Multi-Objective Optimization Algorithm
J. Offshore Mech. Arct. Eng (August 2025)
Effects of Aerodynamic Damping and Gyroscopic Moments on Dynamic Responses of a Semi-Submersible Floating Vertical Axis Wind Turbine: An Experimental Study
J. Offshore Mech. Arct. Eng (April 2025)
Investigating the Impact of System Parameters on Flow-Induced Vibration Hard Galloping Based on Deep Neural Network
J. Offshore Mech. Arct. Eng (August 2025)
Related Articles
A Consistent Analytical Model to Predict the Structural Behavior of Flexible Risers Subjected to Combined Loads
J. Offshore Mech. Arct. Eng (May,2004)
Characterizing the Wave Environment in the Fatigue Analysis of Flexible Risers
J. Offshore Mech. Arct. Eng (May,2006)
Numerical
and Analytical Modeling of Unbonded Flexible
Risers
J. Offshore Mech. Arct. Eng (May,2009)
A Finite Element Analysis for Unbonded Flexible Risers Under Torsion
J. Offshore Mech. Arct. Eng (November,2008)
Related Proceedings Papers
Related Chapters
Production Riser Life Extension – A Class Perspective
Ageing and Life Extension of Offshore Facilities
Nonmetallic Pressure Piping System Components Part A: Experience With Nonmetallic Materials in Structural/Pressure Boundary Applications
Online Companion Guide to the ASME Boiler & Pressure Vessel Codes
Section XI Flaw Acceptance Criteria and Evaluation Using Code Procedures
Online Companion Guide to the ASME Boiler & Pressure Vessel Codes