Análise comparativa da resistência mecânica entre elementos estruturais constituídos de concreto/aço e concreto/prfc

Abstract

Seeking improvements in several areas, society advances in search of technological innovations in the discovery of new materials, and composite materials are products of this technological advance, characterized by presenting better performances in their applicability due to the combination of polymer, metal and ceramic materials in a single material. The present study aimed to analyze the mechanical strength demonstrated by composite materials made of reinforced concrete with CFRP and compare its results with the steel reinforced concrete, traditionally used in constructions. Therefore, different geometries of CDPs were made, both conventional and self-compacting concrete were used and the reinforcements were manufactured in bars and also in meshes. Additionally, it was studied which type of stirrup best adapts to CFRP bars and which characteristics of the concrete/CFRP interface provide the best adhesion resistance. The analyzes of this study were carried out due to the manufacture of CDPs in 4 distinct groups. The results showed that despite the use of different materials to manufacture the stirrup and the changes made in the connection interface of the CFRP bars and the concrete, such as the alternation of surface coatings used in the CFRP bars and the variation of concrete with different strengths, it was observed a parity in the values of mechanical resistance of the materials reinforced concrete with CFRP bars and concrete reinforced with steel. However, the use of CFRP in meshes molded externally to the concrete presented values of mechanical strength with an order of magnitude significantly higher when compared to the use of steel in meshes molded externally to the concrete, making this reinforcement configuration the most suitable for increasing mechanical strength. from the composite material reinforced concrete with steel to the composite material reinforced concrete with CFRP.