### UDC:

624.071

### DOI:

10.23968/1999-5571-2021-18-6-42-50

### Pages:

42-50

### Annotation:

As a result of calculations in the probabilistic formulation, it is shown that the security of the results of calculating the load-bearing capacity of reinforced concrete elements with symmetric reinforcement under eccentrical compression depends on the eccentricity of the longitudinal force and the quantity of longitudinal reinforcement. To increase the security of the results of calculating the load-bearing capacity of a eccentrically compressed reinforced concrete element with a normal cross-section in the area of small eccentricities, it is proposed to reduce the calculated value of the maximum deformation of concrete under compression. The analysis of the influence of the calculated value of the maximum deformations of concrete under compression on the results of calculating the strength of an eccentrally compressed reinforced concrete element with a normal cross-section has shown that reducing the calculated value of the maximum deformations of concrete under compression by 15% from 2.00% to 1.7% increases the security of the results of calculating the load-bearing capacity in the area of small eccentricities. At the same time, the security of the results of the calculation of the load-bearing capacity at large eccentricities practically does not change. To make a decision on the optimal design value of the maximum concrete deformations under compression, it is necessary to carry out a large amount of experimental studies to specify the characteristics of their statistical distribution.

Keywords:

- нелинейная деформационная модель
- деформационные характеристики бетона
- надёжность железобетонных конструкций
- внецентренно сжатый железобетонный элемент
- коэффициент вариации
- изменчивость характеристик
- обеспеченность несущей способности
- nonlinear deformation model
- deformation characteristics of concrete
- reliability of reinforced concrete structures
- eccentrically compressed reinforced concrete element
- coefficient of variation
- variability of characteristics
- bearing capacity provision