Analysis of Rehabilitation Effect on the Improvement Capacity of Reinforced Concrete Beams with FEM

AbstractStructures which are exposed to earthquake or detrimental environments may require rehabilitation in their service life. One of the common ways for strengthening the reinforced concrete sections is using the FRP sheets. These materials have a considerable effect on the improvement of shear capacity and the aim of this article is focused on the investigation of the influence of CFRP sheets used in the external sides of the beams. The nonlinear finite element method is used to modelling the concrete beams. The results show that using of CFRP sheets leads to improving considerably the ultimate load capacity of the beam. The relation of the number of layers and the arrangement of sheets with the strengthening of beams is also investigated. The improvement of bending capacity of beam is done by using the rebar. In this respect the common rebar's are placed in the external sides of the section and are restrained in the end of beam. The modelling of rebar is also done by using the nonlinear finite element method. The ultimate load and ductility of beams is compared between the rehabilitated and non–rehabilitated beams. ANSYS software is used to modelling and analysis of beams. All of the models are compared with experimental results