PSI - Issue 47

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Caroline Bremm et al. / Procedia Structural Integrity 47 (2023) 261–267 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

Fig. 4. Influence of the cross-section of the sample (square and circular) on the axial compression strength, by considering h/b=2.0, for the Model A and the Model B for different boundary conditions.

Fig. 5 shows the comparison between the failure configuration obtained by the Model A and the Model B, by considering the Frictionless condition for a square cross-section with a slenderness level equal to 1.0, and the experimental ones by Driely et al. (2020). In the experimental campaign, polytetrafluoroethylene (PTFE) was used at the interfaces between the sample and the loading platen in order to reduce friction, simulated by the Frictionless condition. The numerical results show a satisfactory agreement with the experimental ones in terms of failure configuration, independently of the model employed.

Fig. 5. Comparison between numerical and experimental (Driely et al. (2020)) failure configurations for the Frictionless condition.

4. Conclusions In this work, two models have been developed to investigate the influence of the contact boundary condition and specimen geometry on concrete compressive strength. From the results obtained, it is possible to conclude that the contact boundary condition, specimen slenderness, and cross-section shape influence the axial compressive strength of concrete. Therefore, the numerical models have been able to estimate failure configuration by considering different boundary conditions.