## 4 Discussion  
The article is a scientific study aimed at obtaining new knowledge on the development of existing ideas about the operation of bar structures and, at the same time, has practical significance. This allows us to simplify a number of tasks of the building complex, as the end user of our scientific research.  
Researchers have conducted similar tasks in papers [27]. However, in their studies, they looked for somewhat different patterns. They assumed a rectangular cross-section of the rod element and varied the boundary conditions with the ratio of the bending moment and the transverse force.  
Additionally, an interesting study led to [28] studies being canceled. The authors of this study perceive the shear load on a full-scale cantilever and continuous beams with a span of up to 7 m. The section taken was only rectangular. The influence of the destruction of the longitudinal working reinforcement and the deformation of concrete on the bearing capacity was studied in detail.  
There are also studies of the operation of beams without transverse reinforcement, performed by numerical methods. For example, the authors of paper [29] used 3D finite elements to simulate the operation of these beams. The reinforcement was modeled with bar elements. In this case, patterns of cracking and reaching the limit state were obtained.  
The above studies did not investigate the effect of the cross-sectional shape on the bearing capacity from the shear load.  
It can be seen that the shear force is distributed between the longitudinal elements in a ratio that correlates with the ratio of their axial moments of inertia. It can also be seen that the change in the distribution of forces depends on the type of loading (on the edge or on the shelves). Our results agree with the works [18; 30].  
Small-scale experiments have proved the need to take into account the work of the shelves when the shear force is perceived by a complex composite section. The distribution took place in the ratio of 83% on the edge, and 17% on the shelves. These values show the convergence with the results of numerical simulation, in which the distribution was as follows: 86% on the edge, and 14% on the shelves. The discrepancy between numerical simulation and small-scale experiments is 3%.  
Thus, when calculating screw-reinforced concrete piles, it is necessary to take into account the total section of concrete, taking into account the thread section falling into the section plane. This fact allows more efficient use of resource-intensive elements such as concrete in building structures. Additionally, for piles, it is necessary to take into account the reactive thrust of the surrounding soil, since part of the transverse load will be perceived by it. Numerically, this effect can be taken into account by the elastic bed coefficient distributed along the length of the pile shaft. For this study, the most simplified model was used.  
The result obtained showed the correctness of the approach, which takes into account the shelves in the calculation of the shear force. It should be clarified to what extent the transverse reinforcement of the shelves complements the transverse reinforcement of the central rib. This question is relevant in view of the fact that the calculated length from C\({}_{\text{min}}\) to C\({}_{\text{max}}\) (see Figure 3) at the rib and shelves have different values.  
It is also worth noting the characteristic pattern of cracking for the tee section. On the side surface of the shelves, the crack propagates at a certain angle to the horizontal axis. When moving to a vertical edge, the crack propagation angle decreases. This effect can be explained by two factors:  
1. Influence of longitudinal reinforcement bars;
2. The critical fracture plane for the rib is farther away from the support than at the flanges. When the influence of shelves on cracking disappears, cracks try to make up for the untrodden path. This effect indicates a complex distribution of shear stresses in the body of the structure.