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Evaluating the Performance of the Concrete Filled Composite Tube Column under Axial Compression Load

Alinejad, Ali | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49951 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. The purpose of this research is evaluating of how the concrete filled composite tube column performs. Nowadays in the construction industry, a new kind of composite column called concrete filled composite tube (CFCT) columns, have become very common. Concrete and composite tubes posses’ complementary performance. Because on one hand, the composite tube makes proper confinement for concrete, on the other hand the concrete prevents internal and local buckling of the composite tube. One of the major advantages of the concrete filled composite tube columns compare to the reinforced concrete column is that there is no further need for reinforcement and molding, which results in swifter construction of the structures and reduction of the molding costs. To mention some of the other advantages it can be said that these particular columns have smaller sections therefore lighter in weight; also concrete filled composite tube columns are more resistant to humidity.In recent decades steel tubes has been the material of choice for concrete confining but low corrosion resistance has been the major flaw witnessed in these cases. Employing composite tubes can address the issue because of their higher resistance to corrosion. For evaluation of how the PVC tube affects on the behavior of concrete filled composite tubes, some concrete filled PVC tubes were modeled by Abaqus software. The results demonstrate that the presence of the PVC tube make the concrete column more ductile and have a significant effect on the stress-strain curve of the samples after the peak stress, in a way that the confinement increased by raising the thickness of the PVC tube, but the confinement effect of the PVC tube decreased by the increment of the sample diameter and compressive strength of the concrete core. Moreover, the results represent that the existing gaps on the ends of the samples, intensified the reduction of the compressive strength of the samples and caused the PVC tube act faster than the case without the gaps
  9. Keywords:
  10. Finite Element Method ; Confinement ; Reinforced Concrete Columns ; Composite Tubes ; Axial Loads ; Composite Column

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