Analytical modelling of welded t-joints with SHS chord member and passing-through plate

This study aims to extend the Eurocode 3 Part 1.8 approach for tubular constructions by developing analytical tools for designing and modelling joints between Square Hollow Section (SHS) columns and passing-through IPE beams using the component method. It focuses on the behaviour of a critical component influencing these beam-to-column joints: the passing-through plate transversally welded to the column and subjected to tension/compression loads. This component represents the behaviour of passing-through beam flanges at their attachment with the SHS column, significantly impacting joint performance by affecting deformability and potentially limiting resistance due to local chord failure in the tube. No existing studies address this specific structural detail. While Wardenier and Lu investigated SHS connections with externally welded plates under axial loads in the late 20th century, current standards only include their formulations. However, even though the development of 3D Laser Cutting Technology has enabled similar connections with passing plates, yet few studies address this configuration. This paper tries to fill this gap through monotonic tests on T-joints featuring SHS chords and passing-through plates. A Finite Element (FE) model is developed using ABAQUS software and validated against experimental results. Using the validated FE model, parametric studies identify key parameters affecting connection response. Subsequently, equations for strength prediction, derived from the yield-line and yield-field methods, are developed alongside recalibration of an existing stiffness formulation. These findings aim to enhance joint design methodologies for tubular constructions.