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Stress Concentration Factors of Concrete-Filled T-Joints under In-Plane Bending: Experiments, FE Analysis and
Feleb Matti1, Fidelis Mashiri1
1School of Engineering, Western Sydney University, Second Ave., Kingswood, NSW 2747, Australia.
Materials (Basel, Switzerland)
|September 23, 2022
Summary
Concrete infill reduces stress concentration factors (SCFs) in steel hollow section T-joints by up to 22%. This study provides new design formulas for these structural components under bending.
Area of Science:
- Structural Engineering
- Materials Science
- Computational Mechanics
Background:
- Cold-formed steel (CFS) square hollow section (SHS) T-joints are critical structural components.
- Understanding stress concentration factors (SCFs) in these joints is essential for safe design.
- Limited research exists on SCFs in concrete-filled SHS T-joints under in-plane bending.
Purpose of the Study:
- To experimentally and numerically determine SCFs in concrete-filled SHS T-joints under static in-plane brace bending.
- To validate finite element analysis (FEA) models against experimental data.
- To develop design formulae for predicting SCFs in these joints.
Main Methods:
- Experimental investigation using strain gauges on seven concrete-filled SHS T-joints.
- Numerical analysis using Abaqus FEA software.
- Parametric study to evaluate the influence of non-dimensional parameters on SCFs.
Main Results:
- Good agreement between experimental and numerical SCF determination.
- Proposed design formulae showed comparable results to numerical SCFs.
- Concrete infill reduced peak SCFs by an average of 22% (experimental) and 19% (numerical).
Conclusions:
- FEA is a reliable method for analyzing SCFs in concrete-filled SHS T-joints.
- The proposed design formulae can accurately predict SCFs.
- Concrete infill significantly reduces SCFs, enhancing the performance of SHS T-joints under in-plane bending.
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