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Numerical Modelling on Effects of Elevated Temperatures on the Performance of Concrete-filled Pultruded GFRP Tubular Columns

Mollakhalili, Arian | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56807 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Concrete-filled FRP tubes have gained popularity among structures in areas with harsh environmental condition. Despite their unique material properties such as resistance to corrosion, noticeable axial stiffness, and durability, FRP materials have poor resistance to elevated temperatures. This paper presents numerical investigations on the behavior and capacity of concrete-filled pultruded GFRP tubes (CFGFTs) after exposure to elevated temperatures under concentric compression. Variables in this study were the tube’s thickness of 3, 5, and 7mm, the infill concrete’s compressive strengths of 30 and 60MPa, and the exposure temperature of 25, 100, 200, 300, and 400°C. The results in this study were verified with the available experimental data. In this investigation, ABAQUS was used as the finite element software to model and analyze the samples. After verification with experimental data, the results were compared with predictions presented in north American guidelines for the design of fiber reinforced elements and also several recent investigations. The results indicated that the thickness of the tube was the most effective parameter in the axial load bearing capacity of CFGFTs, while differences in the concrete’s compressive strength did not influence the results significantly. Furthermore, the results showed that as the exposure temperature increases, the axial load bearing capacity of the specimens decrease consistently. In addition, the comparison between the peak load values obtained from experiments and the codes’ predictions showed that the design guidelines for externally bonded FRP systems underestimate the peak load bearing capacity
  9. Keywords:
  10. Confined Concrete ; Concrete-Filled Polyethylene Tubes (CFPT) ; Elevated Temperature ; Finite Element Method ; Glass Fiber Reinfoced Polymer (GFRP) ; Pultrution Method ; Concentric Compressive Load

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