A simple solution for prediction of steel fiber reinforcd concrete behavior under flexure

The main objective of this study is to drive a simple solution for prediction of steel fiber reinforced concrete (SFRC) behavior under four point bending test (FPBT). In this model all the force components at the beam section (before and after cracking) are formulated by applying these assumptions: a bilinear elastic-perfectly plastic stress-strain response for concrete behavior in compression, a linear response for the un-cracked tension region in a concrete constitutive model, and an exponential relationship for stress-crack opening in the crack region which requires two parameters.Then the moment capacity of the critical cracked section is calculated by applying these assumptions and satisfying equilibrium lawat critical cracked section. After that, parametric studies have been done on the behavior of SFRC to assess the sensitively of model. Finally the proposed model has been validated with some existing experimental tests.The result shows that the proposed solution is able to estimate the behavior of SFRC under FPBT with simplicity and proper accuracy.