چكيده به لاتين
Abstract:
Adverse weather conditions and various chemical factors are usually the reasons for the damage to concrete sections. One of the most common damage is the rust or the corrosion of the rebar in the concrete sections. In our country, due to the presence of areas with wet weather conditions, many concrete members are subjected to the corrosion. Therefore, there is a need for some kind of retrofitting which in the stated conditions, is sufficient and durable.
The use of carbon fiber retrofitted polymers with their mechanical and chemical properties is known as one of the suitable strategies for rigorization.
In this thesis, it is tried to discuss the various corrosion states and their effects on concrete sections. Then, with the modeling of reinforced beams which are subjected to corrosion of 20% and 40% from the tensile rebars and rocks, the Abaqus program examines the capacity of these sections before and after retrofitting with CFRP.
Reinforcement was done in two general ways, design for flexural reinforcement and shear reinforcement.
For the first case, due to the bending weakness of the section, the design was done for the width and thickness of the fibers. The bending capacity for corrosion of 20% and 40% decreased to 22% and 36%, respectively, compared to non-corrosion. These results indicate that lower bar widths increase the efficiency and adhesion between concrete and fibers.
For shear reinforcement in accordance with many conventional methods and researches, the corrugations were made in V-shaped, 90-degree shapes on both sides and U-shaped. The results showed that the carbon fiber reinforcement can restore the lost resistance to the corrosion cross section.
Keywords: Reinforcement, Corrosion, Reinforced Concrete Beam, CFRP
