Due to its compound cross-section, the prediction of the structural response of flexible pipes to loads such as their self-weight, internal and external pressure, movements imposed by the floating system and environmental loads such as currents, waves and wind is quite complex. All these loads generate stresses and strains in the cross section of the pipe that have to be properly evaluated in order to ensure integrity of the line. Research has been done on the local behavior of flexible pipes under combined axisymmetric loads as well as under bending loads. However, there is a lack of research combining both axisymmetric and bending loads, as also in the study of the strains in the tensile amour layers of the pipes, aspects which are important for the calibration of theoretical models to predict such behavior. Based on that, this study aims to evaluate the local behavior of flexible pipes under combinations of axisymmetric (tension, and internal pressure) and bending loads via a series of experimental tests in a 9.13″ I.D pipe. In the experimental tests, the behavior of the pipe was studied for three load combinations: i) bending combined with tension; ii) bending combined with internal pressure; and iii) bending combined with tension and internal pressure. Based on these tests, the authors obtained the strains in the tensile armor layer, axial elongation due to tension, axial reaction forces due to internal pressure, and deflection due to bending. These measurements were used to calibrate a theoretical model devoted to simulate the pipe’s response, getting accurate results for stiffness and stresses of the pipe in each scenario.
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ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
June 8–13, 2014
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4547-9
PROCEEDINGS PAPER
A Theoretical and Experimental Analysis of the Bending Behavior of Unbonded Flexible Pipes
Tatiana Vargas-Londoño,
Tatiana Vargas-Londoño
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
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José Renato M. de Sousa,
José Renato M. de Sousa
Poli/UFRJ, Rio de Janeiro, RJ, Brazil
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Carlos Magluta,
Carlos Magluta
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
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Ney Roitman
Ney Roitman
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
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Tatiana Vargas-Londoño
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
José Renato M. de Sousa
Poli/UFRJ, Rio de Janeiro, RJ, Brazil
Carlos Magluta
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
Ney Roitman
COPPE/UFRJ, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2014-24247, V06BT04A027; 11 pages
Published Online:
October 1, 2014
Citation
Vargas-Londoño, T, de Sousa, JRM, Magluta, C, & Roitman, N. "A Theoretical and Experimental Analysis of the Bending Behavior of Unbonded Flexible Pipes." Proceedings of the ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. Volume 6B: Pipeline and Riser Technology. San Francisco, California, USA. June 8–13, 2014. V06BT04A027. ASME. https://doi.org/10.1115/OMAE2014-24247
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