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Ocean Systems Engineering
  Volume 12, Number 1, March 2022 , pages 001-22
DOI: https://doi.org/10.12989/ose.2022.12.1.001
 

SCFs in offshore two-planar tubular TT-joints reinforced with internal ring stiffeners
Hamid Ahmadi and Hossein Imani

 
Abstract
    The majority of tubular joints commonly found in offshore jacket structures are multi-planar. Investigating the effect of loaded out-of-plane braces on the values of the stress concentration factor (SCF) in offshore tubular joints has been the objective of numerous research works. However, due to the diversity of joint types and loading conditions, a number of quite important cases still exist that have not been studied thoroughly. Among them are internally ring-stiffened two-planar TT-joints subjected to axial loading. In the present research, data extracted from the stress analysis of 243 finite element (FE) models, verified against available numerical and experimental data, was used to study the effects of geometrical parameters on the chord-side SCFs in two-planar tubular TT-joints reinforced with internal ring stiffeners subjected to two types of axial loading. Parametric FE study was followed by a set of nonlinear regression analyses to develop six new SCF parametric equations for the fatigue analysis and design of axially-loaded two-planar TT-joints reinforced with internal ring stiffeners.
 
Key Words
    fatigue; internal ring stiffener; offshore jacket structure; stress concentration factor (SCF); two-planar tubular TT-joint
 
Address
Hamid Ahmadi: Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, Iran;
Center of Excellence in Hydroinformatics, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
Hossein Imani: Faculty of Civil Engineering, University of Tabriz, Tabriz 5166616471, Iran
 

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