PSI - Issue 68

Lucie Malíková et al. / Procedia Structural Integrity 68 (2025) 225–230 L. Malíková et al. / Structural Integrity Procedia 00 (2025) 000–000

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Taking into account the scale of the vertical axis, it can be stated that the s qq ,max values are only slightly dependent on the distance from the anchor’s corner. When the influence of the thickness of the anchor’s basement on the maximum tangential stress values shall be commented, it can be stated that this parameter does not have very high effect on these values either, especially at larger critical radial distances. On the other hand, the effect of the different values of the anchor basement’s thickness on the angle where the tangential stress reaches its maximum (which is related to the angle of the concrete cone failure) can be seen in Fig. 5. The last Fig. 5 represents the dependence of q max values on the anchor basement’s thickness obtained at the circle with the radius of 4 mm around the anchor’s corner.

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q max [deg]

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Fig. 5. Dependence of q max values on the anchor basement’s thickness for the selected radial distance R C = 4 mm.

The curve in Fig. 5 shows the following finding: the higher the thickness of the steel anchor’s basement, the higher the value of the q max angle. In other words, when the anchor’s basement is thicker, the crack causing the concrete cone failure propagates in more vertical direction towards the upper surface of the concrete substrate. Of course, this can be also connected to the decreasing amount of the concrete above the anchor’s basement, because in our study, the constant anchor’s embedment depth L em was considered, see Fig. 1a. Additional both numerical and experimental studies are planned for these widespread structures. 4. Conclusions This work analyses features of the concrete cone failure typical for cast-in anchors subjected to tensile loading. Finite element simulations were used to investigate distribution of the tangential stress near the anchor’s basement corner. According to maximum tangential stress criterion, directions for potential crack propagation were investigated and their dependences on selected parameters were discussed. It can be concluded that both the thickness of the anchor’s basement and the choice of the critical radial distance have no effect on the value of the maximum tangential stress. Nevertheless, it was observed that the angle corresponding to the concrete cone failure increases with the increasing thickness of the anchor’s basement. This can be important for design of anchor/concrete systems where this kind of failure modes occurs. Note that this paper contains only pilot results of the extensive future study in this research field. Acknowledgements This paper was created as part of the project No. CZ.02.01.01/00/22_008/0004631 “Materials and technologies for sustainable development” within the Jan Amos Komensky Operational Program financed by the European Union and