Abstract
To substantiate plasticity theory application to the strength problems solution of structural concrete, concrete plates under different load schemes, truncated wedges over a dangerous inclined crack, as well as Gvozdev samples as a basis for defining shear resistance, have been studied. The virtual velocities principle has been applied. Concrete is regarded as a rigid-plastic body. Plastic strain is considered to be localized in thin layers on the elements failure surface. The function of the virtual velocities principle is dealt at stationary state. The failure kinematic schemes and the calculated dependencies for the specified samples strength evaluation have been given. The ultimate estimation of the upper load is used. The stresses are defined at the characteristic points of the concrete strength condition, which is considered as plastic potential. The stress levels at the boundary of the shear and breaking-off failure forms have been obtained. The concrete plasticity measure is established as the ratio of the compressed zone height in the normal section in the failure stage to its height in the initial stage. Taking into account the plasticity measure, the stresses on the failure surface compressed area have been determined. The interval of the stress states in the tension-compression area is narrowed compared to the interval for plastic materials. The established boundary between the shear and the breaking off is confirmed experimentally. The plasticity theory application area for the strength problems solution is specified.
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Dovzhenko, O.O., Pohribnyi, V.V., Pents, V.F., Pents, M.V. (2020). On Clarification of the Application Area of the Concrete Plasticity Theory to the Strength Problems Solutions. In: Onyshchenko, V., Mammadova, G., Sivitska, S., Gasimov, A. (eds) Proceedings of the 2nd International Conference on Building Innovations. ICBI 2019. Lecture Notes in Civil Engineering, vol 73. Springer, Cham. https://doi.org/10.1007/978-3-030-42939-3_3
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