Static strength of doubler plate reinforced tubular T/Y-joints subjected to brace compressive loading: Study of geometrical effects and parametric formulation

Article


Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Static strength of doubler plate reinforced tubular T/Y-joints subjected to brace compressive loading: Study of geometrical effects and parametric formulation." Thin-Walled Structures. 107, pp. 231-247. https://doi.org/10.1016/j.tws.2016.06.009
Article Title

Static strength of doubler plate reinforced tubular T/Y-joints subjected to brace compressive loading: Study of geometrical effects and parametric formulation

ERA Journal ID3825
Article CategoryArticle
AuthorsNassiraei, Hossein (Author), Lotfollahi-Yaghin, Mohammad Ali (Author) and Ahmadi, Hamid (Author)
Journal TitleThin-Walled Structures
Journal Citation107, pp. 231-247
Number of Pages17
Year2016
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0263-8231
1879-3223
Digital Object Identifier (DOI)https://doi.org/10.1016/j.tws.2016.06.009
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S026382311630338X
Abstract

In this study, the ultimate strength, initial stiffness, and failure mechanisms of tubular T/Y-joints reinforced with doubler plate under axially compressive load are numerically investigated. At the first step, a finite element (FE) model was developed and verified against the data available from eight experimental tests. At the next step, 210 FE models were generated and analyzed to evaluate the effect of joint geometry and doubler plate size on the static strength of doubler plate reinforced T/Y-joints under axially compressive load. Results showed that the ultimate strength of a doubler plate reinforced T/Y-joint can be up to 295% of the strength of the corresponding unreinforced joint. Also, doubler plate reinforcement method can considerably increase initial stiffness and improve the failure modes of tubular T/Y-joints subjected to axially compressive load. Afterwards, the deformed shapes of doubler plate and collar plate reinforced T- and Y-joints are compared. Despite the considerable effect of the doubler plate on the static strength, its feasible application during the joint fabrication, and the frequent usage of CHS T/Y joints in offshore jacket-type platforms, the ultimate strength, initial stiffness, and failure modes in doubler plate reinforced Y-joints under axially compressive load have not been studied. Also, so far no design equation is available to determine the ultimate strength of T- and Y-joints reinforced with doubler plate under the axially compressive load. Hence, after the parametric investigation, a new formula is derived, through nonlinear regression analysis, to determine the ultimate strength in such case.

KeywordsCHS T/Y-joint, Doubler plate, Axially compressive load, Ultimate strength, Parametric design equation
ANZSRC Field of Research 2020401504. Ship and platform structures (incl. maritime hydrodynamics)
400510. Structural engineering
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Byline AffiliationsUniversity of Tabriz, Iran
Institution of OriginUniversity of Southern Queensland
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Lotfollahi-Yaghin, Mohammad Ali, Rastgar, Mehdi and Ahmadi, Hamid. 2012. "Slamming induced dynamic response of a floating structure." Journal of Marine Science and Technology (Taiwan). 20 (2), pp. 201-209. https://doi.org/10.51400/2709-6998.1839
A probability distribution model for stress concentration factors in multi-planar tubular DKT-joints of steel offshore structures
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2012. "A probability distribution model for stress concentration factors in multi-planar tubular DKT-joints of steel offshore structures." Applied Ocean Research. 34, pp. 21-32. https://doi.org/10.1016/j.apor.2011.11.002
Geometrically parametric study of central brace SCFs in offshore three-planar tubular KT-joints
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2012. "Geometrically parametric study of central brace SCFs in offshore three-planar tubular KT-joints." Journal of Constructional Steel Research. 71, pp. 149-161. https://doi.org/10.1016/j.jcsr.2011.10.024
Effect of stress concentration factors on the structural integrity assessment of multi-planar offshore tubular DKT-joints based on the fracture mechanics fatigue reliability approach
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Effect of stress concentration factors on the structural integrity assessment of multi-planar offshore tubular DKT-joints based on the fracture mechanics fatigue reliability approach." Ocean Engineering. 38 (17-18), pp. 1883-1893. https://doi.org/10.1016/j.oceaneng.2011.08.004
Distribution of weld toe stress concentration factors on the central brace in two-planar CHS DKT-connections of steel offshore structures
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Distribution of weld toe stress concentration factors on the central brace in two-planar CHS DKT-connections of steel offshore structures." Thin-Walled Structures. 49 (10), pp. 1225-1236. https://doi.org/10.1016/j.tws.2011.06.001
Geometrical effect on SCF distribution in uni-planar tubular DKT-joints under axial loads
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Geometrical effect on SCF distribution in uni-planar tubular DKT-joints under axial loads." Journal of Constructional Steel Research. 67 (8), pp. 1282-1291. https://doi.org/10.1016/j.jcsr.2011.03.011
Geometric stress distribution along the weld toe of the outer brace in two-planar tubular DKT-joints: Parametric study and deriving the SCF design equations
Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2011. "Geometric stress distribution along the weld toe of the outer brace in two-planar tubular DKT-joints: Parametric study and deriving the SCF design equations." Marine Structures. 24 (3), pp. 239-260. https://doi.org/10.1016/j.marstruc.2011.02.005
Geometrical Parametric Study and Development of Design Formulae for the SCF Distribution Along the Weld Toe in Multi-Planar CHS DKT-Connections of Offshore Structures
Lotfollahi-Yaghin, Mohammad Ali, Ahmadi, Hamid and Shahverdi, Sajad. 2011. "Geometrical Parametric Study and Development of Design Formulae for the SCF Distribution Along the Weld Toe in Multi-Planar CHS DKT-Connections of Offshore Structures ." ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Rotterdam, The Netherlands 19 - 24 Jun 2011 American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2011-49121
Effect of geometrical parameters on SCF distribution along the weld toe of tubular KT-joints under balanced axial loads
Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2010. "Effect of geometrical parameters on SCF distribution along the weld toe of tubular KT-joints under balanced axial loads." International Journal of Fatigue. 32 (4), pp. 703-719. https://doi.org/10.1016/j.ijfatigue.2009.10.008
Dynamic behaviour of damaged reinforced concrete beams and application of white noise analysis to crack detection
Lotfollahi-Yaghin, M.A., Shahinpar, R. and Ahmadi, H.. 2009. "Dynamic behaviour of damaged reinforced concrete beams and application of white noise analysis to crack detection." Journal of the South African Institution of Civil Engineering. 51 (2), pp. 2-10.