Reforço de borda de aberturas em lajes de concreto armado utilizando fibra de carbono

Abstract

The carbon fiber is a synthetic material that presents, as main features the high traction resistance and low density. Because of these characteristics, carbon fiber is vastly used on the automotive industry since last century, making possible huge weight reduction on high performance cars and improving your aerodynamics. In the construction industry, carbon fiber used already in Japan, United States and Europe since 1980s with the main application at structures reinforce. On slab reinforcement, carbon fiber may presents as a good solution due the facility to application, that can be done for a few men and without specific set of tools, and because there is no need for shoring on the structure to be reinforced. On this study, initially an analysis of bending moments on slabs with different sizes and different apertures with the point of analyze the influence of the aperture dimensions on the extra moments that comes up with it. Besides that, the analysis has the objective of verify the exemption from verification of the apertures on slabs present on NBR 6118 (2014). After the slab analysis, a step by step of the calculation of the reinforcement using carbon fiber composites externally adhered to the concrete through a case study using a slab modelled during the analysis. The calculation of reinforcement will be done through two methods, the first does not consider the pre-existing deformation on slab, which lead the engineer to accomplish some tasks before the fiber application, and the second does consider that deformation caused due the normal use of the structure.