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<p>This study evaluates the flexural performance of rectangular concrete-filled double-skin tubular (CFDST) beams with recycled lightweight concrete and reinforced with intermittently- welded plate stiffeners. Six full-scale beams were tested under four-point bending, including a CFST beam, an unstiffened CFDST beam, and four stiffened CFDST beams with single and double plate stiffeners welded at spacings of 20<i>t</i> and 40<i>t</i>. The recycled concrete mix in this study is incorporated with expanded polystyrene (EPS) beads and recycled aggregate to reduce structural weight while enhancing sustainability. Experimental results showed that the plate stiffeners effectively delayed local buckling and enhanced confinement and structural capacity. Compared to the unstiffened CFDST, the beams with double stiffeners and 20<i>t</i> weld spacing exhibited up to 23.5% higher flexural strength, 27% greater stiffness, and 29.8% better energy absorption. The finite element (FE) models developed in ABAQUS reproduced the observed moment–deflection responses with a mean <i>M</i><sub><i>u,FEM</i></sub> /<i>M</i><sub><i>u,Exp</i></sub> ratio of 0.98. This <i>M</i><sub><i>u,FEM</i></sub> /<i>M</i><sub><i>u,Exp</i></sub> value is used in the parametric analyses. Results confirmed that the thickness of the outer tube and yield strength are the key determinants of flexural performance, while the concrete’s compressive strength has minimal effect. The study results provided new insights into sustainable CFDST beam systems, validated the numerical models, and provided design recommendations for lightweight, stiffened composite structures.</p>

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Flexural behavior of rectangular CFDST beams with intermittently-welded plate stiffeners and recycled-lightweight concrete

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Amjad Ali K. Sharba,
  • Mohd Reza Azmi,
  • Mohd Yazmil Md. Yatim

摘要

This study evaluates the flexural performance of rectangular concrete-filled double-skin tubular (CFDST) beams with recycled lightweight concrete and reinforced with intermittently- welded plate stiffeners. Six full-scale beams were tested under four-point bending, including a CFST beam, an unstiffened CFDST beam, and four stiffened CFDST beams with single and double plate stiffeners welded at spacings of 20t and 40t. The recycled concrete mix in this study is incorporated with expanded polystyrene (EPS) beads and recycled aggregate to reduce structural weight while enhancing sustainability. Experimental results showed that the plate stiffeners effectively delayed local buckling and enhanced confinement and structural capacity. Compared to the unstiffened CFDST, the beams with double stiffeners and 20t weld spacing exhibited up to 23.5% higher flexural strength, 27% greater stiffness, and 29.8% better energy absorption. The finite element (FE) models developed in ABAQUS reproduced the observed moment–deflection responses with a mean Mu,FEM /Mu,Exp ratio of 0.98. This Mu,FEM /Mu,Exp value is used in the parametric analyses. Results confirmed that the thickness of the outer tube and yield strength are the key determinants of flexural performance, while the concrete’s compressive strength has minimal effect. The study results provided new insights into sustainable CFDST beam systems, validated the numerical models, and provided design recommendations for lightweight, stiffened composite structures.