Estudo comparativo da NBR 6118 e Eurocode 2 no dimensionamento de pilares isolados de concreto convencional e de alto desempenho em estruturas de nós fixos

Abstract

The necessity for more economical, leaner and more durable constructions is motivation for studies and scientific advances that are increasingly gaining viability in the market. Among such advances, high performance concrete (HPC) has been greatly improved due to have high compressive strength, low porosity and allow the reduction of armor and slimmer elements. In this context, NBR 6118: 2014 was updated recently aiming to attend this material also. By contrast, Eurocode 2: 2004 is consolidated for several years in the design of HPC structures. Thereby, comparing the methodology for calculating of both standard applied to isolated columns of fixed knot structures using conventional and high performance concrete. It was used 30 MPa and 70 MPa resistances for an internal column, an edge column and a perimeter column, that were dimensioned from the form of both standard. Besides, the objective was to evaluate for the internal column, through the NBR, an optimal point of resistance to compression and an optimal point of section dimensions with respect to obtaining the minimum reinforcement calculated. In the comparison between standards, for conventional concrete, the brasilian standard is slightly more conservative, while for high performance concrete the NBR presented considerably higher values, since minimum reinforcement for the situations analyzed and the standards differ in the calculation of this. Finally, the use of HPC has led to a reduction in steel rate and of section dimensions, which demonstrates the potential of this material.