The paper presents in detail the experimental and numerical investigations on tubular joints that are stiffened internally with three annular rings in order to study their behaviors and evaluate their strengths under axial brace compression loading. The nominal chord and brace diameters of the tested T and Y-joints were 324 and 219 mm and their thicknesses were 12 and 8 mm, respectively. The tested joints are approximately quarter-size when compared to the largest joints in the platforms built in a shallow water depth of 80 m in the Bombay High field. Some of the joints were actually fabricated by a leading offshore agency that is directly involved in the fabrication of prototype structures. Bending of the chord as a whole was observed to be the predominant mode of deformation of the internally ring-stiffened joints in contrast to ovaling and punching shear of the unstiffened joints. Strengths of the internally ring-stiffened joints were found to be almost twice that of unstiffened joints of the same dimensions. A tri-linear stress-strain model that takes into account the strain-hardening characteristics of the material was developed to assess the strength of the internally ring-stiffened joints. Finite element analysis (FEA) was performed to predict the bending deflection of the internally ring-stiffened joints under axial brace compression loading. This FEA used NISA II software package and was based on the tri-linear model proposed in this study. [S0892-7219(00)00104-7]
Skip Nav Destination
Article navigation
November 2000
Technical Papers
Investigations on Internally Ring-Stiffened Joints of Offshore Platforms
T. S. Thandavamoorthy, Deputy Director
T. S. Thandavamoorthy, Deputy Director
Structural Engineering Research Centre, Madras, CSIR Campus, Tharamani, Chennai 600 113, Tamil Nadu, India
Search for other works by this author on:
T. S. Thandavamoorthy, Deputy Director
Structural Engineering Research Centre, Madras, CSIR Campus, Tharamani, Chennai 600 113, Tamil Nadu, India
Contributed by the OMAE Division for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received by the OMAE Division, May 28, 1999; revised manuscript received May 22, 2000. Associate Technical Editor: J. E. Indacochea.
J. Offshore Mech. Arct. Eng. Nov 2000, 122(4): 233-242 (10 pages)
Published Online: May 22, 2000
Article history
Received:
May 28, 1999
Revised:
May 22, 2000
Citation
Thandavamoorthy, T. S. (May 22, 2000). "Investigations on Internally Ring-Stiffened Joints of Offshore Platforms ." ASME. J. Offshore Mech. Arct. Eng. November 2000; 122(4): 233–242. https://doi.org/10.1115/1.1290401
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
Experimental and Numerical Investigations on Unstiffened Tubular T-Joints of Offshore Platforms
J. Offshore Mech. Arct. Eng (November,2009)
Finite-Element Modelling of Multi-Planar Offshore Tubular Joints
J. Offshore Mech. Arct. Eng (February,2004)
Fatigue Strength Assessment on a Multiplanar Tubular KK-Joints by Scaled Model Test
J. Offshore Mech. Arct. Eng (April,2016)
Stress Concentration Factors in T and K-T Tubular Joints Using Finite Element Analysis
J. Energy Resour. Technol (December,1988)
Related Proceedings Papers
Related Chapters
Numerical Simulation of Spatial Synergic Interaction in the Double-Row Anti-Sliding Piles
Geological Engineering: Proceedings of the 1 st International Conference (ICGE 2007)
Inspection-Based Life Extension of Offshore Jacket Fleets
Ageing and Life Extension of Offshore Facilities
Subsection NB—Class 1 Components
Companion Guide to the ASME Boiler & Pressure Vessel Codes, Volume 1 Sixth Edition