A model to simulate the contribution of fibre reinforcement for the punching resistance of RC slabs

Abstract

In this paper analytical formulations are developed for the prediction of the punching resistance of flat slabs 17 of steel fibre reinforced concrete (SFRC) flexurally reinforced with steel bars. By performing statistical 18 analysis with a database that collects experimental results on the characterization of the post-cracking 19 behaviour of SFRC, equations are determined for the evaluation of the residual flexural tensile strength 20 parameters (fRi) from fundamental data that characterize steel fibres. The fRi strength parameters proposed by 21 CEB-FIP 2010 were used for the definition of the stress-crack width law (s-w) that simulates the fibre 22 reinforcement mechanisms in cement based materials. In the second part of the paper is described an 2 analytical formulation based on the concepts proposed by Muttoni and Ruiz, where 23 the s-w law is 24 conveniently integrated for the simulation of the contribution of steel fibres for the punching resistance of 25 SFRC slabs. By using a database composed of 154 punching tests with SFRC slabs, the good predictive 26 performance of the developed proposal is demonstrated. The good performance of this model is also 27 evidenced by comparing its predictions to those from other models.