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Enhancing Load Resistance of Tubular T-Joints in Offshore Platforms Using Collar Plates and Ring Stiffeners
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DOI：10.1007/s13296-025-01020-z.png)
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Abstract
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This study investigates the ultimate strength and deformation behaviour of tubular T-joints, often used in offshore structures, reinforced with collar plates and external ring stiffeners. The nine T-joints for three different beta values, 0.25, 0.5 and 0.75 and with two different strengthening techniques (1) external ring stiffeners and (2) collar plate, were studied under brace compression. The effects of key parameters such as beta (brace-to-chord diameter ratio), gamma (chord slenderness ratio), and stiffener configurations on joint performance were analysed. Finite Element Analysis (FEA) results demonstrated close agreement with experimental data, showing a variation of less than 4%. Reinforcements significantly enhanced load-carrying capacity, with ring stiffeners increasing strength by up to 36% and collar plates by 39%. The optimal parameters, including beta = 0.75 and gamma = 20, improved stiffness and minimised deformation. Finite Element Analysis (FEA), and EC3 code predictions were compared, demonstrating close agreement with R-2 values of 0.9726 and 0.9577 for collar plate and ring-stiffened joints, respectively. These findings highlight the effectiveness of reinforcements in improving joint strength and structural integrity of offshore platform.
Keywords:
T-joint
Brace to chord diameter ratio
Collar plate
External ring stiffener
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