Static strength of offshore tubular T/Y-joints reinforced with collar plate subjected to tensile brace loading

Nassiraei, Hossein and Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid ORCID: (2016) Static strength of offshore tubular T/Y-joints reinforced with collar plate subjected to tensile brace loading. Thin-Walled Structures, 103. pp. 141-156. ISSN 0263-8231


This paper studies the static strength of circular hollow section (CHS) T/Y-joints reinforced with collar plates subjected to axial tension load. The SOLID186 in ANSYS was utilized to establish the finite element (FE) models of the T/Y-joints. Validation of the FE model with experimental data showed that the present FE model can accurately predict the ultimate strength, initial stiffness and failure modes of collar plate reinforced and unreinforced tubular joints. Afterwards, 210 FE models were generated and analyzed to investigate the effect of joint geometry and collar plate size on the ultimate strength, failure mechanisms, and initial stiffness through a parametric study. Results indicated that the ultimate strength of the collar plate reinforced T- and Y-joints under brace tension can be up to 200% and 180% to that of the strength of the corresponding unreinforced joint, respectively. Also, The strengthening influence of the collar plate length and collar plate thickness on the ultimate capacity becomes more significant when one of these parameters is big. Moreover, the comparison between failure modes of reinforced and unreinforced joints showed that the collar plate can significantly improve the failure mechanisms. Also, the collar plate can significantly increase the initial stiffness. Despite this significant difference between the ultimate strength, failure mode, and initial stiffness of unreinforced and collar plate reinforced T- and Y-joints under brace tension, investigations on these types of reinforced joints have been limited to very few T-joint tests. Also, no design equation is available to determine the ultimate strength of T- and Y-joints reinforced with collar plates. Therefore, the geometrically parametric study was followed by the nonlinear regression analysis to develop an ultimate strength parametric formula for the static design of collar plate reinforced T/Y-joints under brace tension.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 22 Jul 2022 01:33
Last Modified: 25 Jul 2022 03:15
Uncontrolled Keywords: Tubular T/Y-joint, Axial tension, Collar plate, Strengthening, Parametric design equation
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
40 ENGINEERING > 4015 Maritime engineering > 401501 Marine engineering
Socio-Economic Objectives (2020): 17 ENERGY > 1702 Energy exploration > 170203 Oil and gas exploration
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