PSI - Issue 36

O. Kononchuк et al. / Procedia Structural Integrity 36 (2022) 177–181 O. Kononchu к , V. Iasnii, N. Lutsyk / Structural Integrity Procedia 00 (2021) 000 – 000

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comparison with experimental approaches. Based on the experimental studies, numerical calculations could be performed taking into account a wide range of parameters, such as external loads, mechanical and physical properties of materials, geometric dimensions, defects, etc. One of the most suitable software solutions are ABAQUS and ANSYS, which allow performing numerical modelling in combination with experimental studies of reinforced concrete structures behaviour, in particular reinforced by polymeric composite materials. One of the fundamental studies in the field of numerical simulation of reinforced bending concrete structures behavior under loading is presented by Kachlakev et al. (2001). The authors analytically analysed several models of beams and proposed a number of methods of their strengthening by composite polymers using ANSYS. The efficiency and good correlation of simulated results with experimental one are shown. Based on the proposed strengthening schemes, the authors succeeded in improving the strength characteristics of reinforced concrete beams. Experimental studies and simulation approaches of the reinforced concrete structures behaviour using FEM are demonstrated in numerous researches for particular pre-loaded ones (Brena et al. (2003)), reinforced by polymer composites (Arduini et al. (1997), Brena et al. (2003), Murali et al. (2011), Ritchie et al. (1991)) or by shape memory alloy (Bykiv et al. (2020)). The results of finite element (FE) simulation of the bending reinforced concrete beams before and after their reinforcement with carbon plastics (CFRP), and under the action of a one-time load are analysed in the works by Kaminska et al. (1998) and Kononchuk et al. (2017). The results, obtained by FEM, are in a good agreement with the experimental data in the region up to critical loads. The increase of reinforced concrete structures by composite materials indicates the necessity of further researches, in particular using finite element analysis software. So, it is important to provide numerical operational simulation and estimate the mechanical characteristics of full-scale bended reinforced concrete elements before and after their strengthening by carbon-fibre reinforced plastics and under the various types of external loads. 2. Modelling technique The full-scale 3D model of reinforced concrete beams strengthened by carbon plastic tape Sika CarboDur S-512 (Fig. 1) was developed in ANSYS. Based on the symmetry conditions, a quarter of a reinforced concrete (RC) beam was simulated. Parameters of model and methodology of modelling described in details by Kononchuk et al. (2017).

Sika ® CarboDur ® S512

Fig. 1. 3D finite element model of a reinforced beam.

To represent the behaviour of the samples the stress-strain diagrams of concrete under compression (Fig. 2) and the coefficients (Kachlakev et al. (2001), Kononchuk et al. (2017)) presented in Table 1 were implemented in FE model.