The new approach for numerical calculating of stress and strain state of underground structures is presented in this issue. The advantage of this method is using in design scheme a real diagram of concrete and reinforcement materials. Also, these calculations are allowed to trace the process of deformation of reinforced concrete in each of the sections of the structure. In the technique, static calculations of reinforced structural elements when changing their initial conditions or stress state after strengthening are carried out taking into account new data. A three-dimensional finite element calculation is also carried out while taking into account regulatory loads. Assessment of levels of tangential and tensile stresses in walls makes it possible to target reinforcement and parameters of monolithic stiffness belts. Numerical results for discussion are presented in this paper.
Modern requirements of engineering practice in tunnel construction are related to the problems of strength and the identification of reserves of bearing capacity of tunnel lining. The achieved success in creating rational reinforced concrete structures of tunnel linings is largely determined by the results obtained in the field of mathematical and mechanical modeling of deformation processes. Reinforced concrete large-sized building structures constitute the main structural elements of the Tashkent underground tunnels in Uzbekistan, as reinforced concrete under proper conditions gives a significant technical and economic effect, reducing the time and cost of construction. Experiments on the bending of reinforced concrete beams with a gradually increasing load indicate various stages of the stress condition. To achieve the most economical consumption of materials, it is proposed to calculate structures for the forces that act under breaking load. This paper presents a method for calculating the lining of reinforced concrete tunnels of the Tashkent underground based on the more accurate assessment of the fundamental properties of reinforced concrete that determine its behavior under external load.
In this paper, for the objective assessment of stress-strain state parameters of backfill arched road bridge, the research work is carried out, where the model of reinforced concrete, corrugated structure is exposed to modern land transport load.
In the course of numerical studies, stresses and deformations in sections of structure and the soil are determined. These studies allow revealing the mechanism of operation of corrugated reinforced concrete structures in the body of an embankment of highways when passing modern transport loads along with them.
In this paper is presented the results of calculations of reinforced concrete structure of metro station in the form of cupola located at the intersection of interstation tunnels. The constructive solution of station is economical, allows diversifying its architecture and using the internal space for placing objects of the national economy. One of the important design stages is the assessment of the stress-strain state of structure with different boundary conditions when it is exposed to external loads. It is assumed that deformable environment surrounding the tunnel station is elastic and is modeled by discrete bearing reaction located in contact with the station. The structure is modeled by finite shell elements. As the result of calculation the principal stresses and moments in its sections are determined. The obtained data can be made by designers in determining of structural solution, dimensions and initial sections selection of reinforcement elements.
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