Análise não linear de vigas de concreto armado com fibras de aço

Abstract

In the present work, a proposal is presented for the calculation of the ultimate strength, MR, of reinforced concrete beams with steel fibers (CRFA), considering the non-linear behavior of this material. For this purpose, the proposals of five normative recommendations, ACI 544.4R-88 (1988), RILEM TC 162-TDF (2002), CECS 38 (2004), CEB-FIP (2010) and DAfStb (2010). To evaluate the proposal, a database with 42 beams was used, which broke the bending. The performance of the proposal is judged as a function of the parameter ⅄ = Mexp / Mteo, which defines the ratio between the experimental (BD) and theoretical resistances. It should be noted that the parameter ⅄ is evaluated in terms of accuracy, dispersion, safety and classified according to an adaptation of Demerit Points Classification - DPC. Finally, we present the nonlinear simulation of the moment-curvature relationship with the help of the SAP 2000 software, applying the equations proposed by RILEM TC 162- TDF (200) and the equations developed by Moraes Neto (2013) for the residual resistance of this material.