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Experimental Investigations on Reinforced Concrete Slabs Strengthening by FRP Sheets

Asna Ashary Esfahani, Mansour | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45963 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. A total of four reinforced concrete slabs with dimension of 2200×1000×100 mm strengthened with different layers of GFRP sheets were fabricated and tested. A loading of the slabs was performed using displacement control approach.In addition, nonlinear finite element analysis (NLFEA) using ANSYS package was used to simulate the behavior of the test specimens. After reasonable validation of NLFEA with the experimental test results of companion slabs, NLFEA was expanded to provide a parametric study of sixty two slabs. Forty two numbers of these sixty two slabs were without any opening and were modeled for different type of concrete strength, ratio of length/wide for slabs, type of FRP, number of layers and FRP configurations. Another twenty slabs were modeled with opening in different size, location, different type of layers and configurations of FRP sheets. The load-deflection and failure modes obtained from the experimental test results and the NLFEA evidently confirmed that strengthening of under-reinforced concrete slabs with GFRP considerably improve the flexural strength capacity, however, it reduces the ductility. The increase in the flexural strength and the reduction in the ductility increased with the increase in the number of GFRP layers. This method of strengthening by GFRP layers for slabs is quick, effective and does not interfere with the architectural design of the structure. Comparison between two FRP types showed that the type of FRP has significant influence on the behavior of the strengthened slabs. The difference is attributed to the difference in the mechanical properties and the bonding quality of FRP materials. In addition, changing concrete strength, ratio of length/wide for slabs, number of layers and configurations of FRP sheets and effect of opening in slabs were important factors that were discussed in this paper
  9. Keywords:
  10. Upgrading ; Ductility ; Finite Element Analysis ; Flexural Behavior ; Glass Fiber Reinfoced Polymer (GFRP) ; Concrete Reinforced Slabs

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