The study of statically indeterminate reinforced concrete structures at the present stage is possible with the help of software systems capable of taking into account the nonlinear work of the material, which allows us to fully assess the stress-strain state for a different redistribution of emerging forces provoked by corrosion damage to reinforcement and concrete. Numerical studies of 14 models with corrosion damage in the upper section of a two-span beam in the Ansys software package have been performed. Load-deflection graphs are presented depending on the percentage of corrosion damage. The dependences of the redistribution of tensile forces in the beam reinforcement with different percentages of corrosion damage are shown. It is established that with damages up to 10%, there is a sharp increase in the tensile forces in the span reinforcement of the beams. It is determined that with corrosion damage to the beam up to 70%, the forces in the supporting reinforcement increase to 10%.

Keywords: reinforced concrete beam, redistribution of forces, plastic hinge, corrosion of reinforced concrete, numerical calculation, bearing capacity

Currently, the energy efficiency of buildings is one of the most pressing economic and environmental problems. Reducing energy costs not only minimizes building maintenance costs, but also reduces the negative impact on the environment. This article deals with the problem of increasing the energy efficiency of the enclosing structures of polyclinic buildings and proposes a method for measuring the economic efficiency of the proposed enclosing structures of municipal polyclinics in Moscow. The implementation of an energy-efficient project for the reconstruction of polyclinic buildings requires an integrated approach, which includes the selection of optimal materials and structures, a thorough analysis and calculation of energy efficiency by measuring the savings in heat loss after the reconstruction of buildings. The implementation of this approach will reduce heat loss and increase the comfort of staying inside the buildings.

Keywords: energy efficiency, heat losses, reconstruction, enclosing structures, medical and healthcare institutions

The value of the efficiency of domestic gas boilers of the brand Baxi ECO-4S 24 with various schemes of air supply and smoke removal is considered. The difference in the calculated efficiency values and the passport values is analyzed.

Keywords: efficiency, flue gas discharge, household gas boiler, thermal balance, energy efficiency

The article presents the results of a comparative analysis of practical calculations of driven and bored piles, which have similar geometric parameters and common geological conditions of construction sites. Taking into account the peculiarities of the use of these piles and the available experimental data, the paper analyzes the calculated values of their bearing capacity and gives an engineering assessment of the results of the calculation. The quantitative difference between the determined parameters of the bearing capacity of piles - friction along the lateral surface and frontal resistance, is clearly shown in the constructed diagrams. So, when using the standard values of the coefficients to determine the bearing capacity of piles, we have a significant excess of this parameter for driven piles. The need to use more gentle methods of driving piles to the design depth leads to the possibility of using the technology of arranging bored piles, which have a lower bearing capacity with the same parameters as driven piles. This feature should be taken into account in engineering calculations when selecting the optimal dimensions of bored piles.

Keywords: driven piles, bored piles, geological conditions, engineering calculations, bearing capacity

The subject of the study is the search for relevant solutions for the adaptation of cultural heritage sites. The object of the study is the bell towers of St. Petersburg. The purpose of the study is to systematize the bell towers of St. Petersburg by types and develop a proposal for their adaptation using the example of one of the identified types. The bell towers of cultural heritage objects, as a rule, are urban planning dominants, as well as valuable historical monuments. In this paper, the uniqueness of the bell towers is considered and a variant of their modern use is proposed in order to popularize objects, as well as to form the tourist attractiveness of St. Petersburg. For these purposes, the authors of the article consider it expedient to use the sites of belfries for observation platforms, revealing an overview of the views of the city. The practical value of the study is aimed at involving this type of cultural heritage object in the modern realities of the existence of the city and the church.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

The paper presents the results of a study of the effect of cerium oxide on the sintering process and the basic physico-chemical properties of ceramics based on low-plastic clay with the addition of boric acid. The developed ceramics were obtained by semi-dry pressing at a maximum firing temperature of 1050 ° C. The combined introduction of cerium oxide with boric acid promotes liquid-phase sintering, self-glazing of the ceramic surface and effective filling of pores and voids in it with the vitreous phase. At the same time, cerium oxide increases the refractoriness and chemical resistance of the vitreous phase and equalizes the coefficients of thermal expansion between the crystalline and amorphous phases in the composition of ceramics. The amount of cerium oxide has been determined, which makes it possible to optimally increase the heat resistance, chemical resistance and strength of ceramics. The practical application of the developed composition of the charge makes it possible to use raw materials of low plasticity in the production of high-quality ceramics for lining apparatuses and equipment, lining of industrial buildings and structures, etc. products experiencing mechanical stress with repeated and abrupt temperature changes, as well as in contact with aggressive media.

Keywords: ceramics, heat resistance, chemical resistance, self-glazing, low-plastic clay, cerium oxide, boric acid

The poor performance of the construction of buildings has been the subject of discussion over the past century, and hence, substantial initiatives have been taken to address the poor management. The article aims to evaluate the reality of execution quality in engineering projects in Iraq in the public and private sectors. For this purpose, a questionnaire was designed commensurate with this purpose , and the questionnaire was distributed to engineers and technicians in the public and private sectors. For the data analysis and computation of percentages, mean, and standard deviation for each response, statistical software (SPSS-V28) was utilized. As a consequence of the answer analysis, the results determined that there is a deficiency in the execution quality, project management's obligations to assure and regulate quality, and non-compliance. Also results shown there is a need to use modern and advanced Building Information Modeling programs to ensure and control quality that is characterized by accuracy and clarity, as well as to provide an integrated system to which project parties can return when needed .The current software is used to control execution quality.

Keywords: construction project , Building Information Modeling , quality, quality control, quality assurance.

A research of fibrous gypsum modified with a complex additive has been undertaken. The objective of the research was to identify influence and dosage of complex additive components upon fibrous gypsum water absorption. To fulfil the work there were used gypsum plaster and a modifying complex additive which consisted of the following components: polypropylene fibre, fine-dispersed inert aggregate, super-plasticizer and redispersing polymerous powder. To undertake the research designing an experiment took place and the central composition plan was implemented. The obtained research result made it possible to calculate and analyze descriptive statistics. Positive influence of the researched factors on water absorption decrease was revealed. It was established, that consumption of fine-dispersed inert aggregate and, super-plasticizer promote decrease of fibrous gypsum water absorption. Analysis and processing of the research data allowed obtain a mathematical model of influence of complex additive components consumption on fibrous gypsum water absorption and reveal a fibrous gypsum composition with the minimal water absorption. The obtained model allowed forecast a composition with the minimal water absorption.

Keywords: fibrous gypsum, water absorption, complex additive, modified, central composition plan, model, additive efficiency.

The article presents the results of the development of research in the field of automated teaching of foreign languages (on the example of English) on a mobile device with the IOS operating system. A feature of the developed simulator-training system (TOS) is the possibility of forming an individual approach to teaching students to improve the quality of education, using theoretical and practical material, based on the performance of the student. The introduction of TOS contributes to improving the quality of education due to the ease of mastering the material, as well as a clear control of the topics studied. The relevance of the developed application is determined by the popularity and availability of mobile devices, as well as the high prospects for the implementation of applications (in particular, in the field of education and self-education) for this platform.

Keywords: training systems, mobile devices, foreign languages, training, mobile application, IOS, Apple, information technology

At present time, there are attempts to design and produce forest machines of highly-demanded classes in Russia. The paper evaluates the efficiency of forest machines under identical operating conditions. The analysis showed the possibility of using harvesters and forwarders of joint Belarusian and domestic production for logging works as an alternative to foreign forest machines. Evaluation of proposals revealed advanced Russian and Chinese models of forest machines. The research showed that in our country there are prerequisites for the development of forestry machine-building, while the main problem is the lack of production technologies for the manufacture of modern technological equipment and components. Under these conditions, the evolution of production on the national territory of forest machines and technological equipment without involving domestic or foreign capital and innovative technologies is a difficult task.

Keywords: domestic forest machine building, development prospects, forest machines, production

The article outlines the features of the developed algorithm for controlling autonomous industrial forest management facilities under real operating conditions under the forest canopy. A significant challenge faced by the developers in the presented algorithm was the practical absence of global navigation in the areas of use of potential autonomous industrial forest management objects. Thus the only alternative was local positioning algorithms, which of the existing ones were also unserviceable under real forest canopy conditions. The problem was exacerbated by the high requirements for positioning accuracy not so much for autonomous objects as for positioning accuracy relative to the object of work of the contact elements of technological equipment directly implementing the operations of the industrial timber harvesting process. The developed concept of local positioning has no analogues in the world, belongs to the algorithms of the latest generation, created by the authors on the basis of mathematical modelling of the operations of industrial forestry process and implemented in registered software complexes to manage the information flows that ensure the sustainable functioning of autonomous objects of industrial forestry in real operating conditions.

Keywords: algorithm, method, synthesis, positioning technology, control method, digital model, automation, digitalisation, modelling

The article discusses the features of the use and applicability of identification of parameters of the equivalent circuit of an submersible electric motors. The possibilities of technical implementation with a given accuracy are evaluated for definition the parameters of submersible electric motors substitution circuits under various external influences, as well as when designing submersible electric motors as an integral part of the electro-technical complex of electrical submersible pump units.

Keywords: submersible electric motor, electrical submersible pump unit, identification of parameters of the equivalent circuit of an asynchronous electric machine, mathematic simulation, crude oil production

The stability of three-phase foams stabilized by particles and surfactants (surfactants) of various nature has been studied. The varying degree of hydrophobization of particles by short-chain surfactant hexylamine may be accompanied by a change in the properties of the dispersed system from high-strength and low-stability foams to structured low multiplicity. A decrease in the stability of foams stabilized by hydrophobized titanium oxide particles at a concentration of long-chain surfactant - cetylammonium bromide Cпав≥Сккм may be due to a decrease in the edge angle of wetting of solid particles.

Keywords: foams, solid particles, surfactants, stability

Today, the Russian Federation is among the three leaders in oil production among all countries of the world. This mineral makes up the bulk of our country's exports. The main part of the reserves of "black gold" in our country is concentrated in regions with special climatic and geological conditions (areas of permafrost and seismic activity). This article discusses measures to protect structures from seismic impacts.

Keywords: earthquakes, construction, seismic activity, oil, seismic protection, petroleum products, structures, mining, vertical steel tank

Abstract: This article discusses the prospects and problems of the development of digital technologies in the construction industry of the Russian Federation. The work presents the main legislative acts and federal projects aimed at the digitalization of construction in the country, the features of the introduction of digital technologies at all stages of the life cycle of capital construction projects, including: building information modeling (BIM), their digital twins (Digital Twin), the Internet of things ( IoT), with the help of which a single information space is created that allows collecting, systematizing all the received data, on the basis of which management is carried out at various stages of the life cycle.

Keywords: digital transformation, construction, building life cycle, BIM technologies, Digital Twin

The definition of the possibility of replacing frame filter presses with multi-patron filters with in-house-made cartridges of different porosity is considered. The purpose of the work is to determine the possibility of complete replacement of frame filter presses with multi-patron filters with cartridges of own production. Tasks: - selection of cartridge filter elements; - equipment adjustment. The most effective in operation are the filter elements SL 1016-30 (with pore diameters of 15 and 17 microns). They provide the lowest Kf-value (0.10 ÷ 0.11) and the highest capacity (up to 900 l/h).

Keywords: polymer solution, filter, filter press, filter material, filter capacity, multi-pattern filter, pore diameter

As a result of the work done, the structural features of piezoceramic composites of connectivity 1-3 are determined. Of the various possible methods and materials for piezo-composite electrodes, the only one that is optimally suitable for use in directional ultrasound devices has been selected.

Keywords: piezoceramics, piezocomposite, composite 1-3, piezoelectricity, ultrasound

Based on the review of methods for constructing distribution systems for microwave power amplifiers, a design of a spatial division-summation of power system in the Q-band and a power amplifier based on it is proposed.

Keywords: distribution system, microwave power amplifier, system of spatial division-summation of power