Reforço de vigas de concreto armado pela técnica NSM-FRP

Abstract

Reinforced concrete is one of the most important materials of structural engineering, with a prominent presence in the Civil Construction sector in all parts of the world. Concrete structures may be subject to several factors that require the need for some type of structural reinforcement, such as the natural aging process of buildings or the need to modify the purpose of using the building. There are several possibilities of reinforcement of structural parts and, among these, the application of polymers with carbon fibers. The reinforced or structured polymeric materials with carbon fibers, in addition to the ease and speed of their application as reinforcing elements, have other interesting characteristics such as high mechanical strength, high rigidity, low specific weight and corrosion immunity that motivate their use. In addition, they are applied on small thickness blades, subtly modifying the dimensions of the structural elements that will be reinforced. Carbon Fiber Reinforced Polymers (CFRP) can be applied as structural reinforcement using different techniques and materials, depending on the analyses performed for each particular situation. Among the most recent reinforcement techniques is the one known in the English literature as Near Surface Mounted (NSM), which is characterized by the insertion of fibers in the concrete covering. This work aims to present a bibliographic review about the CFRP used as structural reinforcement, discuss the procedures of the NSM technique and perform a case study involving a reinforced concrete beam reinforced to bending and shear, following the guidelines of the code ACI 440.2R/2017 and the ABNT NBR 6118/2014 standard.