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TECHNICAL PAPERS

Structural Behavior of Dented Tubular Members Under Lateral Loads

[+] Author and Article Information
Claudio Ruggieri

Department of Naval Architecture and Ocean Engineering, University of São Paulo, São Paulo, SP 05508-900, Brazile-mail: claudio.ruggieri@poli.usp.br

José Alfredo Ferrari

Petróleo Brasileiro S. A.-Petrobrás-Exploitation and Production (E&P) Division, Rio de Janeiro, RJ 20035-900, Brazile-mail: jferrari@petrobras.com.br

J. Offshore Mech. Arct. Eng 126(2), 191-197 (May 18, 2004) (7 pages) doi:10.1115/1.1712979 History: Received December 20, 2002; Revised November 20, 2003; Online May 18, 2004
Copyright © 2004 by ASME
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References

Sagatun,  S. I., Herfjord,  K., Nielsen,  F. Gunnar, and Huse,  E., 1999, “Participating Mass in Colliding Risers,” Journal of Marine Science and Technology, 4, pp. 58–76.
Li, Y., and Morrison, D. G., 2000, “The Colliding Participating Mass-A Novel Technique to Quantify Riser Collisions,” Proc. of ETCE/OMAE-Offshore Mechanics and Artic Engineering, New Orleans.
Durkin,  S., 1987, “An Analytical Method for Predicting the Ultimate Capacity of a Dented Tubular Member,” Int. J. Mech. Sci., 29, pp. 449–467.
Pacheco,  L. A., and Durkin,  S., 1988, “Denting and Collapse of Tubular Members-A Numerical and Experimental Study,” Int. J. Mech. Sci., 30, pp. 317–331.
Duan, L., and Chen, W. F., 1989, “Analysis Considering Dent Damage Effects” in Structural Failure, Wierzbicki and Jones, Eds., John Wiley & Sons, pp. 209–268.
A. P. I. RP-2A, 1997, “Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Working Stress Design,” American Petroleum Institute.
Ellinas, C. P., and Walker, A. C., 1983, “Damage on Offshore Tubular Bracing Members,” Proc. of International Association for Bridge and Structural Engineering (ISBSE Colloquium), pp. 253–261, Copenhagen.
Thomas,  S. G., Reid,  S. R., and Johnson,  W., 1976, “Large Deformations of Thin-Walled Circular Tubes Under Transverse Loading-I: An Experimental Survey of the Bending of Simply Supported Tubes Under a Central Load,” Int. J. Mech. Sci., 18, pp. 323–333.
Watson,  A. R., Reid,  S. R., Johnson,  W., and Thomas,  S. G., 1976, “Large Deformations of Thin-Walled Circular Tubes Under Transverse Loading-II: Experimental Study of the Crushing of Circular Tubes by Centrally Applied Opposed Wedges-Shaped Indenters,” Int. J. Mech. Sci., 18, pp. 387–397.
Watson,  A. R., Reid,  S. R., and Johnson,  W., 1976, “Large Deformations of Thin-Walled Circular Tubes Under Transverse Loading-III: Further Experiments on the Bending of Simply Supported Tubes,” Int. J. Mech. Sci., 18, pp. 501–509.
Reid, S. R., and Goudie, K., 1989, “Denting and Bending of Tubular Beams Under Local Loads” in Structural Failure, Wierzbicki and Jones, Eds., John Wiley & Sons, pp. 331–364.
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Koppenhoefer, K., Gullerud, A., Ruggieri, C., Dodds, R. and Healy, B., 1994, “WARP3D: Dynamic Nonlinear Analysis of Solids Using a Preconditioned Conjugate Gradient Software Architecture,” Structural Research Series (SRS) 596, UILU-ENG-94-2017, University of Illinois at Urbana-Champaign.
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Figures

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Schematic illustration of potential collision between two adjacent risers
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Deformation of simply supported beam subjected to indentation 8. (a) Schematic trajectory of lateral load normalized by the plastic limit load vs. dent depth; (b) pure denting; (c) denting and bending; (d) collapse.
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Schematic illustration of test rig for testing the pipe specimens with a rigid cylindrical indenter having the same diameter as the tube: (a) simply supported pipes; (b) axially loaded pipes
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Tensile stress-strain response at room temperature for the API N80 steel employed in the experiments
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Measured load-dent depth response for the simply supported pipes
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Measured load-dent depth response for the axially loaded pipes
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Quarter symmetric, 3D finite element model for the simply supported tested pipe with S=1000 mm
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Comparison between experimentally measured load-dent depth and numerical predictions for the simply supported pipes
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Comparison between experimentally measured load-dent depth and numerical predictions for the axially loaded pipes
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Comparison between the Ellinas and Walker formulation and the experimental results for the simply supported pipes
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Load vs. dent depth response for a 9 5/8 riser with varying load spans S=1000, 2000, 3000 and 6000 mm
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Load vs. dent depth response for a 9 5/8 riser with S=3000 mm and varying applied axial tension (top tension)

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