Document Type : Research Paper


1 Ashur University College - Iraq

2 Civil Engineering Department, University of Technology - Iraq


The main objectives of this study are: encouraging the production and use of  self-compacting  concrete,  use  of  materials  which  are  lightweight,  easy to  use,  and  highly  efficient  in  the  retrofitting  of  reinforced  concrete buildings. Six deep beams specimens (L= length of 1400mm, h= height of 400mm,   and   b=   width   of   150mm)   were   cast   using   self-compacting concrete.  The  location  of  the  openings  is  in  the  middle  of  assumed  load path.  Five  patterns  were  adopted  to  arrange  carbon  fiber  reinforced polymer (CFRP) strips. The cylinder compressive strength of the concrete was  approximately  equal  for  all  beams  and  was  about  (44  MPa)  at  28 days  age.  All  the  beams  have  the  same  steel  reinforcement  for  shear  and flexure. There have been many tests for fresh and hardened concrete. The reinforced  concrete  deep  beams  were  tested  up  to  (60%)  of  the  ultimate load of control beams to simulate degree of damage, and then released the load. After that,the beams were retrofitted using (CFRP) strips, and then the beams were tested to failure. The study was focused on determining the vertical mid-span deflection, ultimate load, the load that causes first shear and flexural cracks, and mode of failure. Theresults showed that, the best increase in the ultimate failure load was (27.27%) and achieved using the inclined  strips  pattern  and  the  pattern  of  vertical  and  horizontal  strips together.  Reduction  in  the  deflection  values  for  the  retrofitted  beams compared  to  the  control  beam  by  about  (12-13%)  due  to  restrictions imposed by CFRP strips and the epoxy.