<p>Composite construction with FRP confined concrete filled hybrid columns is gaining popularity in the field of structural engineering. The improvement of axial strength in Fibre Reinforced Polymer (FRP) steel double skin tubular columns (DSTCs) with shear connectors and confinement rings involves several synergistic mechanisms, enhancing load-carrying capacity, stability, and structural performance. Experimental investigation on concrete filled Hybrid double skin Tubular columns with FRP as outer tube and steel as inner tube with and without shear connectors/studs, with and without confinement rings is carried out. The effects of Shear connectors and Confinement rings attached to steel tube, their combined effect and the angle of orientation of fibres in GFRP tube on the behavior of these hybrid columns are studied. In this work, Hybrid Double skin Tubular Columns in which replacement of the outer steel tube in CFDST by FRP tube with plain steel tubes acts as control specimen. The angle of orientation of fibres in the GFRP tube considered were 0°, 0/90° and 45°. FRP-confined double skin tubular columns exhibit different structural behaviors depending on fibre orientation especially specimens with 45° orientation provides greater ductility, making the structure more flexible under stress and specimens with 0° orientation results in stiffer behavior with higher load capacity but provide less flexibility. The combination of shear connectors and confinement rings enhances ductility across all specimens compared to using confinement rings alone.</p>

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Axial Performance of Concrete-Filled Double Skin hybrid Tubular Columns: Role of Shear Connectors and Confinement Rings

  • S. Sharmila,
  • A. Martin Carm,
  • S. Praveenkumar

摘要

Composite construction with FRP confined concrete filled hybrid columns is gaining popularity in the field of structural engineering. The improvement of axial strength in Fibre Reinforced Polymer (FRP) steel double skin tubular columns (DSTCs) with shear connectors and confinement rings involves several synergistic mechanisms, enhancing load-carrying capacity, stability, and structural performance. Experimental investigation on concrete filled Hybrid double skin Tubular columns with FRP as outer tube and steel as inner tube with and without shear connectors/studs, with and without confinement rings is carried out. The effects of Shear connectors and Confinement rings attached to steel tube, their combined effect and the angle of orientation of fibres in GFRP tube on the behavior of these hybrid columns are studied. In this work, Hybrid Double skin Tubular Columns in which replacement of the outer steel tube in CFDST by FRP tube with plain steel tubes acts as control specimen. The angle of orientation of fibres in the GFRP tube considered were 0°, 0/90° and 45°. FRP-confined double skin tubular columns exhibit different structural behaviors depending on fibre orientation especially specimens with 45° orientation provides greater ductility, making the structure more flexible under stress and specimens with 0° orientation results in stiffer behavior with higher load capacity but provide less flexibility. The combination of shear connectors and confinement rings enhances ductility across all specimens compared to using confinement rings alone.