Behavior study of concrete joints

In this paper، the effect the FRP reinforcement on concrete connections for increasing shear and bending strength and its ductility is studied. A nonlinear analysis is carried out by using the ANSYS software and a three dimensional model of the connection under gravitational and lateral loading is considered. By employing different methods of rehabilitation for two typical connect -ions; it is shown is that when the lateral FRP reinforcement fiber of the most are positioned at 45 degrees with respect to bottom of the beam is the most effective foe increasing the shear strength as well as the ductility. Also it is concluded that for beams with a larger amount of longitudinal reinfo -rcement bars، the rehabilitation is relatively more effective.