In recent years, thin-walled, cold-formed steel (CFS) structural members have gained expanding use in building construction and various sorts of structural systems [1,2,3].The utilization Cold-Formed Steel (CFS) structures has become progressively popular in different fields of building technology. The reasons behind the developing popularity of these products include their ease of fabrication, high strength/weight ratio and suitability for a wide range of applications. These advantages can result in more economic designs, as compared with hot-rolled steel, especially in short-span applications. In this project work attempt has been made to use Cold formed steel section as replacement to conventional steel reinforcement bar.

-The paper presents practical aspects of experimental research and numerical modeling of stress-strain parameters of the proposed construction element -plastic tube concrete (PTC). The obtained experimental data indicating the loss of load-bearing capacity enabled one to perform finite element analysis and to examine equivalent stresses in the middle sections of the simulated specimens through Mohr theory. The resulting numerical dependences are well conformed with the experimental data and make it possible to give a calculated justification for the experimentally proven increase in the loadbearing capacity of a PTC structure with respect to a nonencased concrete structure. The established load-bearing capacity coupled with the low cost and availability of plastic tubes makes it possible to consider PTC as an effective construction approach for some elements of building framing erected in record-breaking time, in restricted construction areas and along with other obstacles complicating traditional concretebased building technology.

The article describes architectural solutions of pergolas adapted for the reproduction of synthesized acoustic space. The solution is represented by means of computer modelling and visualizes both processes and ob-jects on the example of construction and calculations. The project design of architectural models is an integral part in the practical reconstruction of the geospatial space studied by the architectural geography.

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precast and monolithic reinforced concrete structures with and without prestressing armature voltages are used as newly designed independent ones, and are the result of work to strengthen existing structures by increasing the cross section. In both cases, the cross-section of such elements is considered as a two-layer, and the resulting composite element operates under load in conditions distributed between the layers of internal forces, the mechanism and the actual value of the distribution of which depends on the physical and mechanical characteristics, the design scheme and the parameters of the contact interaction of the layers. When calculating and designing prestressed reinforced concrete precast and monolithic elements, the shear seam compliance is usually not taken into account, which complicates the analysis of the actual stress-strain state of the structure and contains a certain undisclosed potential for its rational design. One of the possible directions in solving the problem, taking into account the shift of the contact seam, is the use of variational principles of structural mechanics in the calculation of structures such as composite cross-section rods. In the framework of this work, the questions of practical applicability in the structural analysis of composite reinforced concrete precast-monolithic rod of variation principles of structural mechanics based on the method of V.Z. Vlasov – I.E. Mileykovsky in the form of displacements in combination with the stepwise-iterative method of calculation are considered. The results of numerical calculations by the proposed method are presented, which allows to take into account the specifics of the shear bonds of the precast and monolithic layer, to carry out practical accounting of the seam compliance, as well as to take into account the physical nonlinearity of the characteristics of materials, which allows the rational design of precast monolithic structures.