Abstract
The article is devoted to an urgent problem related to the reasonable consideration of changes in the stiffness characteristics of core elements in finite element models when calculating buildings and structures made of monolith reinforced concrete. The approach proposed in the article is aimed at meeting the requirements of SP 63.133330-2018 "Concrete and reinforced concrete structures" and SP 430.1325800.201 "Monolithic structural systems". The sequence and content of the stages of solving the problem of determining conditional coefficients of stiffness reduction are disclosed. The results of calculation of conditional coefficients of stiffness reduction and modulus of concrete deformation are presented on the example. The area of variation of the coefficients and modulus of deformation for a given level of loading of the structure and structure is shown. It is shown how the change in the stiffness of the finite elements affects the redistribution of bending moments in the beam structure in comparison with the calculated model with the initial stiffness of the same for all finite elements of the model.
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