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Compressive Behavior of Confined Concrete Column with FRP Layers

Mohammadian, Armita | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43886 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In recent years, the use of fiber reinforced polymer (FRP) jackets, as an external lateral confinement has found considerable attention in retrofitting and strengthening existing reinforced concrete (RC) columns in earthquake prone areas. The FRP composites have numerous advantages such as ease in application, high strength and stiffness-weight ratio, no corrosion and negligible changes in the member dimension. Most of previous studies have concentrated on evaluation of the effect of confinement with spiral bars or FRP composites, separately. However, in practice both types of confinements exist in strengthening RC columns.
    This paper presents the results of a computational modeling to predict the compressive behavior of concrete cylinders confined with both steel spirals as internal confinement and FRP composites as external confinement. The effect of internal and external confinement on compressive response of concrete are combined and it has also been investigated.
    In this study, 12×40 cm concrete cylinders are modeled by ABAQUS software based on finite element technique. This size specimens with spiral bars as internal confinement and FRP composites as external confinement were experimentally tested. Modeling variables are spiral bar spacing (3 & 5 cm), compressive strength of concrete (30 & 50 MPa), number of FRP layers (1 &2), and type of FRP composites which includes CFRP and GFRP. Modeling includes concrete strengthened with FRP jacket or concrete confined with just steel spiral and concrete with both FRP and spiral confinement.
    The numerical results have been verified with the available experimental data. Predicted stress-strain curves demonstrate an increase in compressive strength, ductility and energy absorption capacity in confined concrete specimens, either with steel spirals with various levels of confinement or FRP jackets with different number of layers. The model shows good agreement with the behavior observed in experimental data
  9. Keywords:
  10. Upgrading ; Confined Concrete ; Compression Strength ; Stress-Strain Diagrams ; Fiber Reinforced Polymer (FRP)

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