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Weld size and resistance in rectangular hollow section T-joints.

Petr Jehlicka1, Frantisek Wald1

  • 1Czech Technical University in Prague, Department of Steel and Timber Structures, Thakurova 2077/7, CZ 166 29 Praha, Czechia.

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Summary

The brace-to-chord width ratio significantly impacts square hollow section joint resistance. This study validates a numerical model and proposes improved design equations for welded T-joints under compression.

Keywords:
ExperimentsFillet weldsFinite element modelsRectangular hollow sectionsSensitivity studyT-joints

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Area of Science:

  • Structural Engineering
  • Mechanical Engineering
  • Materials Science

Background:

  • Chord face failure in hollow section joints is influenced by member dimensions and weld characteristics.
  • Existing design codes may not fully capture the complex behavior of these joints under load.

Purpose of the Study:

  • To investigate the influence of weld type and size on the resistance of square hollow section T-joints.
  • To validate a numerical model against experimental data for accurate joint behavior prediction.
  • To propose modifications to analytical equations in prEN1993-1-8:2021 for improved design.

Main Methods:

  • Experimental testing of welded square hollow section T-joints under axial compression.
  • Numerical modeling using shell elements in RFEM software for research and design purposes.
  • Parametric study involving a wide range of hollow sections.

Main Results:

  • The brace-to-chord width ratio is a critical factor affecting joint resistance.
  • The validated numerical model accurately represents the behavior of square and rectangular hollow section joints.
  • Experimental and numerical results informed proposed modifications to existing design equations.

Conclusions:

  • Weld characteristics and member ratios are crucial for hollow section joint performance.
  • Finite element analysis provides a reliable method for simulating joint behavior.
  • Updated analytical equations are needed to enhance the safety and efficiency of hollow section joint design.