Shear repair of reinforced concrete beams using post-tensioning

Khaloo, A. R ; Sharif University of Technology | 2000

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  1. Type of Document: Article
  2. Publisher: American Concrete Institute , 2000
  3. Abstract:
  4. In this paper, shear strengthening of RC beams by confining shear critical region is experimentally and theoretically investigated. Confinement is implemented using vertical post-compression force in the shear critical region with steel plate, bolts and angles. The loading tests include (1) loading beams to first major shear crack, then shear strengthening, and reloading to complete failure, (2) strengthening beams from beginning and loading to complete failure, and (3) loading unrepaired beam to complete failure. lnt1uences of concrete strength, shear span length, longitudinal tensile reinforcement, level of post-tensioning, presence of shear reinforcement, use of continuous plates, and presence of shear crack are studied by testing twenty-four RC beams. Test results show that in the presence of post-compression stress, as low as 0.04( for strengthening. shear strength increases significantly and the mode of failure of the beams changes from brittle shear to ductile bending. Also, for this level ot post-compression, influence of all other parameters is limited. while a ductile failure is dominant. Calculations based on Mohr's theory also indicate that this method of strengthening is very effective, and provides ductile tlexural behavior in beams with inadequate shear strength. © 2000 American Concrete Institute. All rights reserved
  5. Keywords:
  6. Beam ; Concrete ; Deflection ; Ductility ; Flexural strength ; Post-tensioning ; Repair ; Shear strength
  7. Source: 4th International Conference on Repair, Rehabilitation, and Maintenance of Concrete Structures, and Innovations in Design and Construction, 19 September 2000 through 22 September 2000 ; Volume SP-193 , 2000 , Pages 519-549 ; 01932527 (ISSN); 9780870316913 (ISBN)
  8. URL: https://www.sciencedirect.com/science/article/abs/pii/S0263822315001075