The aim of this paper is to present the influence of the subgrade reaction coefficient modelling on the simple 3D frame. For simplicity, it was assumed that the construction was made on the square foundations on granular soil. The soil reaction coefficient is modelled by different expressions drawn by different authors. For this reason different values of the coefficient were obtained. In order to observe the behaviour of these coefficients for each author curve families are created. They give us the relationship between the dimension of the square foundations and the value of the reaction coefficient. The paper then follows the response of the characteristic structural framework to these impacts.

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The paper presents the structural design of a toll station building on the highway. The subject building consists of two different types of structures, a reinforced concrete skeleton structure of ground floor with a flat roof and a steel structure of the canopy. Two reinforced concrete columns that support the canopy rise above the flat ground floor building. This is also the connection between the concrete and steel structure. All structural elements are calculated according to the current Eurocode regulations and National Annexes.

When analyzing structures, there are several different methods that are used. The method most often used in analysis is the finite element method. The finite element method was also used in the elaboration of the problem herein, and it is related to displacement in plate structures. Numerical models will be approximated by finite triangular elements in the CYPE program and by finite square elements in the TOWER 3D Model Builder program. In the end, a comparison will be made of the results and of the influence of the type and density of the finite element mesh as well as the quality of the concrete on the result of the analysis.

This paper is a continuation of the research on the influence of different modeling of the subgrade reaction coefficient on the selected static system. This paper analyzes the behavior of a two-story reinforced concrete frame for different foundation dimensions and different values of the subgrade reaction coefficient. It presents an overview of values of these coefficients, which represent the stiffness of Winkler springs with respect to the specific geometry of shallow foundations. The values are different depending on the author, and the average value was used as relevant for comparison. Results of the numerical analysis for an individual reinforced concrete two-story frame were obtained using the SE_Calc and Tower 8 programs. After obtaining the results for each individual frame, they were combined and analyzed.