The aim of this work is to answer questions concerning fiber-reinforced concrete are dealt with using experimental and numerical methods. In general, the 3-point flexural test according to ÖNORM EN 14651 is one of the most common and important methods to evaluate the post-fracture properties of fiber-reinforced concrete for structural design. From experimental unconfined compression tests and 3-point bending tests, input parameters for the nonlinear material law Concrete Damaged Plasticity (CDP) implemented in the FEM program package ABAQUS are to be determined. For this purpose, parameters for the tensile range are back-calculated from experimental results using the approach with laboratory test data, the bilinear and the modified bilinear approach, and the numerical results are compared with each other and with the laboratory results of the bending tensile tests. Furthermore, the change of the numerical results with additional application of horizontal compressive stress to the concrete specimen is observed with the representative material input parameters.