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TECHNICAL PAPERS

Investigations on Internally Ring-Stiffened Joints of Offshore Platforms

[+] Author and Article Information
T. S. Thandavamoorthy

Structural Engineering Research Centre, Madras, CSIR Campus, Tharamani, Chennai 600 113, Tamil Nadu, India

J. Offshore Mech. Arct. Eng 122(4), 233-242 (May 22, 2000) (10 pages) doi:10.1115/1.1290401 History: Received May 28, 1999; Revised May 22, 2000
Copyright © 2000 by ASME
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References

Chen, W. J., and Han, D. J., 1985, Tubular Members in Offshore Structures, Pitman Advanced Publishing Program, Boston, MA.
Digre, K. A., Krieger, W., Wisch, D. J., and Petrauskas, C., 1994, “API RP 2A Draft Section 17 Assessment of Existing Platforms,” Behavior of Offshore Structures, BOSS ’94, Chryssostomidis, C., et al., eds., Pergamon, Oxford, pp. 467–478.
UEG, 1985, Design of Tubular Joints for Offshore Structures, Under Water Engineering Group, London, UK.
Bozhen,  C., 1990, “Stress Analysis of Ring Stiffened Tubular Joints for Offshore Structures-Review of Studies in China,” China Ocean Eng. 4, pp. 1–12.
Sawada, Y., Idogaki, S., and Sekita, K., 1979, “Static and Fatigue Tests on T Joints Stiffened by an Internal Ring,” Proc., 11th Annual Offshore Technology Conference, pp. 563–572.
Graff, W. J., 1981, Introduction to Offshore Structures, Gulf Publishing Company, Houston, TX.
Shiyekar,  M. R., Kalani,  M., and Belkune,  R. M., 1983, “Stresses in Stiffened Tubular T Joint of an Offshore Structure,” ASME J. Energy Resour. Technol., 105, pp. 177–183.
UEG, 1985, Design of Tubular Joints for Offshore Structures, Under Water Engineering Group, London, UK.
UEG, 1985, Design of Tubular Joints for Offshore Structures, Under Water Engineering Group, London, UK.
Lalani, M., Tebett, I. E., and Choo, B. S., 1986, “Improved Fatigue Life Estimation of Tubular Joints,” Proc., 18th Annual Offshore Technology Conference, Houston, TX, pp. 133–146.
Shiyekar, M. R., and Kalani, M., 1983, “Stresses in Ring Stiffened Tubular Y Joints under Axial and In-plane Moment Loadings,” Proc., Second International Offshore Mechanics and Arctic Engineering Symposium, pp. 258–265.
Ramachandra Murthy, D. S., Madhava Rao, A. G., Gandhi, P., Thandavamoorthy, T. S., Pant, P. K., and Murthy, V. S. R., 1991, “Analytical and Experimental Investigations on Internally Ring Stiffened Steel Tubular Joints,” Fatigue and Fracture in Steel and Concrete Structures, Madhava Rao, A. G., and Appa Rao, T. V. S. R., eds., Oxford & IBH Publishing Co. Pvt., Ltd., New Delhi, India, pp. 715–728.
Nwosu,  D. I., Swamidas,  A. S. J., Munaswami,  K., 1995, “Numerical Stress Analysis of Internal Ring Stiffened Tubular T-Joints,” ASME J. Offshore Mech. Arct. Eng., 117, pp. 113–125.
Wimpey Offshore, 1991, “In-service Database for Ring-Stiffened Tubular Joints,” Report No. WOL 035/91, Wimpey Offshore Ltd., London, UK.
Tahan, N., Chols, N. W. N., Sharp, T. V., and Ma, S. Y. A., 1992, “Uncertainties Associated with the Behavior of Ring-Stiffened Joints Derived from an In-service Database,” Behavior of Offshore Structures, BOSS ’92, Patel, M. H., and Gibbins, R., eds., BPP Technical Services, London, UK, Supplement.
API RP 2A-LRFD, 1993, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Load and Resistant Factor Design, American Petroleum Institute, Washington DC.
IS: 226, 1975, Indian Standard Specification for Structural Steel (Standard Quality), Indian Standards Institution, New Delhi, India.
Kekre,  S. Y., 1994, “Engineering and Construction Division of ONGC Bombay—A Vision for Globalisation,” Oil Asia J., 15, Petrotech ’95 Special , pp. 90–94.
Thandavamoorthy, T. S., 1998, “Assessment and Rehabilitation of Damaged Steel Offshore Structures,” Ph.D. thesis, Anna University, Chennai, India.
Kothawala, K. S., 1991, NISA II User’s Manual, Engineering Mechanics Research Corporation, Troy, NY.
Yamasaki, T., Takizawa, S., and Komatsu, M., 1979, “Static and Fatigue Tests on Large-Size Tubular T-Joints,” Proc., 11th Annual Offshore Technology Conference, Houston, pp. 583–591.

Figures

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Typical undamaged stiffened T -joint
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Typical undamaged stiffened Y-joint
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Typical setup for axial brace compression loading
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Load-midspan deflection curve for undamaged T -joint UDT 1
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Load versus deflection at third point for undamaged T-joint UDT 1
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Load-midspan deflection curve for undamaged Y-joint UDY 1
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Load versus deflection at third point for undamaged Y-joint UDY 1
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Typical load-midspan deflection curve for unstiffened T -joint
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Typical load versus ovaling deformation of unstiffened T -joint
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Comparison of midspan deflections of unstiffened and stiffened joints
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Proposed analytical model for undamaged stiffened joint
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Strain and stress distribution of section at ultimate load
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FE model of undamaged stiffened joints—(a) T -joint; (b) Y -joint
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Superposition of deflections of stiffened T and Y-joints
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Bending of internally ring-stiffened joint
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Punching shear failure of unstiffened joint
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Superposition of midspan deflection and ovaling deformation

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