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Experimental Study on the Behavior of the Expansive Concrete-filled UPVC Tube Columns Confined with GFRP Wraps under Pure Compression

Borhani, Mohammad Hadi | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51724 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. Lateral confinement is a proven method of increasing strength, stiffness and ductility of concrete columns. This is attributed to a created tri-axial stress state in the concrete core due to the confinement resulting in a higher level of endurable deviatoric stress. Plastic pipes are able to create such a confining medium in concrete-filled UPVC tube (CFUT) columns and therefore they can provide the concrete with some benefits of concrete filled steel tube (CFST) column system. Besides, these pipes are cheap, light and they are also easy to handle. Furthermore, they are resistant to corrosion or other forms of deterioration and recyclable and in this aspect, they are environmentally-friendly. The UPVC pipe used in this study has a Poisson ratio of 0.38 while the core concrete’s Poisson ratio is about 0.2 which means a bigger lateral displacement for the plastic pipe with respect to core concrete resulting in a move from tri-axial to uniaxial stress state in concrete. In this research, to overcome the aforementioned problem, a kind of expansive concrete is used at the first stage to reduce the concrete shrinkage and enhance the confinement. At the next step, two layers of GFRP are used for limiting the lateral expansion of the pipe and increasing the concrete confinement. In the end, the slenderness ratio effect on these columns is studied. Not only did expansive materials compensate for the confinement reduction due to the difference between the materials’ Poisson ratios completely, but also they created a condition with a higher level of confinement. The use of GFRP sheets also increased the confinement which results in higher compressive strength and ductility
  9. Keywords:
  10. Confined Concrete ; Concrete-Filled PVC Tube ; UPVC Pipe ; Slenderness Ratio ; Expansive Concrete

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