Resistant Capacity And Failure Modes Of Reinforced Concrete Beams Strengthened In Flexure With Externally Bonded Carbon Fiber Reinforced Plastic [capacidade Resistente E Modos De Ruptura De Vigas De Concreto Armado Reforçadas à Flexão Com Fibras De Carbono]

摘要

To design an externally bonded fiber reinforced plastic reinforcement for a reinforced concrete beam, it is necessary that the engineer responsible chooses to work without the use of mechanisms to increase the anchoring within safe levels, or make use of artifacts to ensure that the deformation in the fiber reaches ultimate state value supplied by the manufacturer. This article shows the basis for the calculation of the two methodologies under the existing criteria more expressively and also makes comparisons with laboratory tests. For enhancement without anchoring, it was found that to prevent unwanted premature and abrupt ruptures, the methods proposed by ACI and FIB showed to be adequate. To ensure the ultimate deformation of the fiber, a mechanism for anchoring in the form of a bow 45° made by the material of the fiber was studied. In this case, the process of balanced sections to foresee the mode of collapse were verified and then the appropriate comparisons were made between the expected values with the tests results found in the laboratory.