Analysis of the Resistance of Joints in Reinforced Concrete Strengthened by FRP Sheets against Released Forces of Earthquake

The beam-column joints in reinforced concrete are crucial parts of structures. Earthquake exerts a high shear force on reinforced concrete which can lead to transfiguration of beam-column. As much attention is not usually paid to junctions in implementation of reinforced concrete structures; therefore, reinforcement of joints and increasing their flexibility are important issues studied by different researchers. A limited number of elements are considered in the present study based on analytical prototype for beam-column joints. In this research, the purpose is the reinforcement of resistance and flexibility of joints against lateral forces which exert in diffraction frame, through resistance of reinforced concrete by using FRP layers. Each of these samples is strengthened by using FRP layers which are made of carbon. A sample of external junction has been specified with its dimensions and placement of reinforcing bars. This method is based upon using leaflets in joint zone, along different directions. The mentioned joints have been modeled three dimensionally and analyzed under nonlinear static load using finite element method by ABAQUS software. Nonlinear materials related to concrete are also considered. Communication bending in connection system between strong beams and columns has been taken into consideration as well. Comparison of results between strengthened and non-strengthened samples for all three joints shows by the reinforcement implemented in this research the inflexibility, porter age capacity and also final flexibility of connections have been improved much.

Keywords:

Making resistant , Reinforced concrete joints , FRP layer , ABAQUS