Model to Simulate the Contribution of Fiber Reinforcement for the Punching Resistance of RC Slabs

• Published in: Journal of materials in civil engineering 2014-07, Vol.26 (7)
• Main Authors: Moraes Neto, Bernardo N, Barros, Joaquim A. O, Melo, Guilherme S. S. A
• Format: Article
• Language: English
• Subjects: Applied sciences; Buildings. Public works; Computer simulation; Concretes. Mortars. Grouts; Exact sciences and technology; Fibre reinforced concrete (including asbestos cement); Materials; Mathematical analysis; Mathematical models; Punching; Reinforced concrete; Slabs; Steel fiber reinforced concretes; Steel fibers; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; Technical Papers
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)MT.1943-5533.0000913

AbstractIn this paper analytical formulations are developed for predicting the punching resistance of flat slabs of steel fiber–reinforced concrete (SFRC) flexurally reinforced with steel bars. By performing statistical analysis with a database that collects experimental results on the characterization of the postcracking behavior of SFRC, equations are determined for evaluating the residual flexural tensile strength parameters (fRi) from fundamental data that characterize steel fibers. The fRi strength parameters proposed by CEB-FIP 2010 were used for the definition of the stress-crack width law (σ-w) that simulates the fiber-reinforcement mechanisms in cement-based materials. The second part of the paper describes an analytical formulation based on the concepts proposed by Muttoni and Ruiz, where the σ-w law is conveniently integrated for simulation of the contribution of steel fibers for the punching resistance of SFRC slabs. By using a database composed of 154 punching tests with SFRC slabs, the good predictive performance of the developed proposal is demonstrated. The good performance of this model is also evidenced by comparing its predictions to those from other models.