Ultimate Capacity of Doubler Plate Reinforced Square Hollow Section T-Joints(Mechanics, Strength & Structure Design)

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This paper reports on an investigation into the ultimate strength of a reinforced Square Hollow Section T-joint under brace axial compression. The project consists of both experimental and numerical studies. A full-scale reinforced T-joint specimen was tested to failure and the results were compared to those obtained from a finite element model. The FE model was able to predict the ultimate failure load and displacements accurately with an error of less than 2% for the failure load and less than 1% for the brace end displacement at the failure load. A parametric study was then conducted to understand the influence of the geometric parameters on the ultimate strength of the reinforced joint. The results of the parametric study show that decreasing α (chord length to chord diameter ratio), and increasing γ (chord diameter to thickness ratio) will increase the ultimate strength of the joint. The parameter β (brace diameter to chord diameter ratio) does not have a significant affect on the strength of the joint. It is also observed that there is an optimum plate and chord thickness that provides significant increases in the ultimate strength of the joint. The results have shown that the plate reinforcement greatly increases the ultimate load of the joint as compared to the capacity of a similar unreinforced joint for small β values. An equation to predict the ultimate load of doubler plate reinforced T-joint is proposed.
大阪大学の論文