Published since 1923
DOI: 10.33622/0869-7019
Russian Science Citation Index (RSCI) на платформе Web of Science

  • Taking into Account the Decrease in Strength of External Layers of Concrete when Calculating Reinforced Concrete Columns by Normal Cross-Sections
  • UDC 624.
    Dmitry V. KUZEVANOV, e-mail:
    JSC Research of Construction, NIIZHB named after A. A. Gvozdev, 2-ya Institutskaya ul., 6, Moscow 109428, Russian Federation
    Abstract. The problem of calculation of reinforced concrete columns with non-uniform concrete strength over the cross-section is considered. Cases and conditions when such heterogeneity arises are shown. An approach to the account of this phenomenon, when controlling the strength of high-strength concrete by introducing a correction factor for the transition from surface strength to strength in the depth of the structure, is presented. The necessity of taking into account such heterogeneity not only when controlling the strength of concrete but when calculating is substantiated. An assessment of correctness of calculations of bearing capacity of compressed elements, when ignoring the fact of the low strength of external concrete layers, is made. The most "cautious" values of permissible limits of changes in the strength of outer and inner layers of concrete in structures, when there are no significant differences in assessing the bearing capacity of elements, are determined. It is shown that the admissible values of the correction factor can vary depending on the sizes of cross-sections of elements controlled. Ways of adapting the existing calculation methods according to normal cross-sections to account the inhomogeneous strength of concrete in section are proposed. Proposals that account non-uniform concrete strength over the cross-section depending on the value of revealed change in the strength of concrete on the surface and in the depth are formulated for practical application.
    Key words: high-strength concrete, deformation model, strength control, strength heterogeneity, reinforced concrete columns, calculation by normal cross-sections.
    1. Korevitskaya M. G, Ivanov S. I., Tukhtaev B. Kh. Features of nondestructive testing of concrete strength with the addition of silica fume. Promyshlennoe i grazhdanskoe stroitel'stvo, 2017, no. 1, pp. 88-91. (In Russian).
    2. Antsibor A. V., Brusser M. I. Determination of heterogeneity of concrete properties over the cross section of concrete and reinforced concrete structures. Stroitel'nye materialy, 2013, no. 12, pp. 24-25 (In Russian).
    3. Veretennikov V. I. To address the heterogeneity of properties of concrete in terms of large-scale vertical rod elements. Sovremennoe promyshlennoe i grazhdanskoe stroitel'stvo, 2011, no. 1, vol. 7, pp. 19-29. (In Russian).
    4. Baiburin A. K., Pogorelov S. N. Study of concrete strength heterogeneity in monolithic structures. Inzhenerno-stroitel'nyy zhurnal, 2012, no. 3, pp. 12-18 (In Russian).
    5. Gorokhov E. V., Yugov A. M., Veretennikov V. I., et al. Accounting effects of systematic heterogeneity of heavy concrete properties for the volume elements in the selection of safe structural systems of buildings, type and form of bearing and protecting designs, the parameters of their manufacture and operation. Bezopasnost' ekspluatiruemykh zdaniy i sooruzheniy, Moscow, 2011. Pp. 146-167. (In Russian).
    6. Bulavitskiy M.S. Equations for concrete strength distribution in the monolithic structure using point calculus mathematical method. Naukoviy v_snik bud-va, 2009, no. 52, pp. 272-278. (In Russian).
    7. Yuasa N., Kasai Y., Matsui I. Inhomogeneous distribution of compressive strength from surface layer to interior of concrete in structures. Special Publication, 2002, vol. 192, pp. 269-282.
    8. Zalesov A. S., Chistyakov E. A., Laricheva I. Yu. New methods of normal sections calculations for reinforced concrete structures on the basis of deformation model method. Beton i zhelezobeton, 1997, no. 5, pp. 31-34. (In Russian).
    9. Zvezdov A. I., Zalesov A. S., Chistyakov E. A., Mukhamediev T. A. Strength calculation for reinforced concrete structures loaded with axial force and bending by new standards. Beton i zhelezobeton, 2002, no. 2, pp. 21-26. (In Russian).
    10. Simbirkin V. N., Matkovskiy V. V. The calculation of stress-strain state and strength of reinforced concrete structures for the normal section. Stroitel'naya mekhanika i raschet sooruzheniy, 2010, no. 4, pp. 20-26. (In Russian).
    11. Mordovskiy S. S. Calculation of reinforced concrete eccentrically loaded elements using the deformation diagrams. Beton i zhelezobeton, 2012, no. 2, pp. 11-15. (In Russian).
    12. Mukhamediev T. A., Kuzevanov D. V. To the problem of calculating reinforced concrete elements loaded with eccentricity by SNiP 52-01. Beton i zhelezobeton, 2012, no. 2, pp. 21-23. (In Russian).
  • For citation: Kuzevanov D. V. Taking into Account the Decrease in Strength of External Layers of Concrete When Calculating Reinforced Concrete Columns by Normal Cross-Sections. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering], 2018, no. 2, pp. 23-27.