Análise comparativa do comportamento dinâmico de uma viga de concreto e uma viga compósita de epóxi e fibra de cana-de-açúcar

Abstract

Composite materials have gained technological relevance for diverse applications in contemporary society due to their properties of high rigidity in relation to the associated low weight. This combination of materials is necessary to achieve properties that are not found in conventional materials. Therefore, an algorithm was developed in MATLAB, considering two simple rectangular profile beams, one made with epoxy resin (matrix) and sugarcane fiber (dispersed phase) and the other made with conventional concrete of class C40; both subjected to a sinusoidal force. Using the Finite Element Method, it was possible to determine two boundary conditions for the beams of each material, one being free-crimping and the other supporting-crimping. From the results obtained numerically, we sought to characterize the dynamic behavior of each material for both boundary situations and compare the two materials for the free-crimp boundary situation. It was concluded that, dynamically, the epoxy resin - sugarcane fiber beam did not prove better than the conventional material (Concrete C40) already used for the manufacture of structural beams, having less stability with lower natural frequencies.