PSI - Issue 28

Zuzana Marcalikova et al. / Procedia Structural Integrity 28 (2020) 957–963 Author name / Structural Integrity Procedia 00 (2019) 000–000

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was chosen for the computational model. The fiber reinforced concrete was incorporated into the fracture-plastic material model (Cervenka and Papanikolaou, 2008). Two concepts presented in (Marcalikova and Sucharda, 2021) were used to model fiber reinforced concrete. The first concept is based on the use of effective values of tensile strength and fracture energy. It was used for dosing 40 kg/m 3 . The second concept is based on the actual modeling of the concrete matrix and fiber reinforcement. This concept was used for dosing 75 and 110 kg/m 3 . The basic the input parameters were taken from laboratory tests. The calculation was performed repeatedly. The resulting values of the load-bearing capacity of the elements correspond to the experiments. Resulting values of calculated total load capacity and the mode of failure of the beams corresponds with the experiments. For illustration, a numerical model of RC beam is shown in Fig. 4 (b).

Fig. 4. RC beam; (a) Test scheme, (b) 3D numerical model – principal stress (max.) for fiber reinforcement – 110 kg/m 3 – max. load 108 kN.

Fig. 5. Functional dependence of load capacity on the amount of fibers.