Effect the Depth of Shearhead on the Behavior of Reinforced Concrete Flat Plate Slabs

Abstract

This research presents an experimental study of effect the depth of shearhead on the behavior of  reinforced concrete flat plate slabs. Three reinforced   concrete slab specimens were casted and tested under static load. The effect of different section depth of shearhead has been discovered through studying its impact on the load-deflection behavior, ultimate capacity, cracking load, failure mode, stiffness, ductility and energy absorption of tested specimens. The result appeared that the specimen with large section height of collar shearhead gives an increase in ultimate capacity and first crack  about 83.5% and 34.6% respectively  over reference specimen So (without  shearhead).Also, the  reduction in stiffness  at failure of specimen CS8  is 82.7%  ,its clear more than  that of specimen  CS7, in comparison  with  it's  stiffness  at 25% . The  increasing  in energy  absorption was about (127.7%) of specimen  with large section height in comparison with  reference  specimen. It is concluded that the loading capacity, stiffness, ductility and energy absorption increased with increasing section depth of shearhead .