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Experimental and Numerical Investigation on the Post-fire Behaviour of Reinforced Concrete Deep Beams

Shabanlou, Mohammad | 2024

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57685 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Massood; Foyouzat, Mohammad Ali
  7. Abstract:
  8. The reinforced concrete deep beam is a structural member with mostly shear behavior that can be seen in various members such as beams of bridges and tall structures, girder beams, and equipment-carrying beams in industrial structures. Due to the non-linearity of the strain in these members, various parameters are important in their behavior and response, including the compressive strength of concrete, the type of loading, the type and amount of shear reinforcement, and the cross-sectional dimensions. Deep beams' ultimate damage and failure are generally shear, brittle, and sudden. Therefore, considering the importance and sensitivity of these crucial structural members, it is necessary to evaluate the parameters affecting their behavior precisely and accurately. Inherent embrittlement of reinforced concrete deep beams, along with the embrittlement of concrete structures due to fire, requires a detailed study of the effects of fire loading on deep beams, as well as considering both groups of parameters affecting the response and behavior of deep beams and concrete structures after exposure to fire. The current study has investigated the behavior of large-scale reinforced concrete deep beams, including eight control specimens and seventeen fire-exposed specimens, with various variables, including concrete compressive strength, type of loading, type and amount of shear reinforcement, and the size of the beams. The main results of the research are that, in addition to the loss of the final capacity of the samples after exposure to fire, a dual behavior is observed in the members made of ordinary and high-strength concrete so that the beams made of normal concrete, after exposure to fire, the overall behavior becomes softer and changes from shear failures to combined bending and shear states; While in beams made of high-strength concrete, the overall behavior changes from the combined state of bending and shear to more brittle and shear states. It was also observed that regardless of the type of concrete, with the increase in the shear-span-to-depth ratio, the ultimate capacity decreases, and the ultimate failure becomes softer and closer to the flexural state
  9. Keywords:
  10. Reinforced Concrete ; Fire ; Shear Reinforcment ; Strut and Tie Model ; Finite Element Method ; Analytical Method ; Deep Beams ; Image Processing

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