Arched constructions of the roofs of span-type buildings are very cost-effective in comparison with beam and frame systems. In many cases, the high architectural qualities of arch structures allow one to obtain expressive interiors of large halls. At the same time, the construction of long span buildings is always associated with high risks, high security requirements for such buildings, and, consequently, increased requirements for reliability to load-bearing structures, including possible local destructions. Actual becomes the issue of ensuring the survivability of building structures in general, and the construction of roofs for long span buildings in particular. To analyze the survivability properties of shallow arched coverings, a number of constructive solutions of arched constructions of various types are considered. The work of arch structures of various types with possible local caving of a number of elements is considered. Five design schemes of arched constructions are presented, and work of each of them is considered at exclusion of the most loaded elements. In particular, the work of the arch structure with fan-shaped tie system with a split upper belt is considered. A comparative analysis of the survivability properties of the constructive solutions under consideration is presented.

Keywords: arched covers, arch structure with fan-shaped tie system, survivability, local destruction, constructive solutions, long span roofs, progressive collapse

The article is devoted to the importance and relevance of the development of underground space, today in large cities there is an acute shortage of areas free from development, as well as the high traffic congestion with personal cars, these and many other problems can be solved through the integrated development of underground space. The classification of underground structures is given. The organizational and technical problems of construction below the zero cycle are indicated. Examples of competent use of underground space in the world are considered. Benefits of construction below zero cycle are also noted. The objects, the construction of which is promising underground, are described. Attention is drawn to the climatic and anthropogenic factors taken into account during construction. In conclusion, the measures that need to be taken for the development of the underground space of our cities are considered.

Keywords: development of underground space urban studies, organization of construction of underground structures, urban space, cramped urban development, organizational and technical problems

This article discusses a hardware and software complex for the study of aerodynamics and electromechanical characteristics of wind turbines (WPP) with a vertical axis of rotation. The created laboratory stand makes it possible to carry out experimental studies of the developed wind power plants, to obtain the dependences of the angular speed of rotation of the rotor and the consumed electric power on the wind speed. To demonstrate the efficiency of the considered vortex-type wind turbine, the corresponding prototypes of wind turbines with a power of 0.2 kW and 1.2 kW were designed and assembled, and their full-scale tests were carried out. The developed software makes it possible to carry out numerical simulation of the motion of a wind turbine with an unsteady undisturbed wind flow, taking into account the mass-inertial characteristics of the installation and the nature of the moment of resistance to the rotation of its rotor. Experimental and numerical results obtained using the developed hardware-software complex are presented and compared. These results indicate the possibility of using such a complex as an effective tool for the development of wind turbines with a vertical axis of rotation.

Keywords: wind power plant, experimental research, software and hardware complex, numerical modeling, numerical methods of dynamics of continuous media

The problem of digitalization of the data accounting system and the problem of managing the technical condition of equipment at thermal power plants are considered. The performance of the entire thermal power plant depends on the operation of the boiler units. If the equipment fails and the necessary measures to resolve the emergency are not taken in time, then the probability of a decrease in the plant's performance up to the suspension of work increases. Thus, the issue of monitoring the technical condition of all operating equipment is relevant. The developed software for automation of the data recording system and visualization of technical parameters of the reliability of boiler and turbine equipment is described. The software has a methodology for determining the technical condition index of equipment. The software was developed using the JavaScript programming language, the React.js library. Digital technologies have been introduced into the process of recording data on the technical condition of equipment, where for the first time the software includes a method for automatic calculation of the technical condition index of boiler units. The software ensures that equipment downtime is reduced, as well as the likelihood of failure or critical breakdown of boilers. Thus, the operation of the software makes it possible to reduce the likelihood of an emergency state of the main equipment of power plants.

Keywords: thermal power plant, boiler and turbine equipment, software, technical condition, reliability, repairn

The water recreation industry is actively developing. An individual pool at home is also not uncommon for a long time, because everyone wants to live in comfortable conditions. Modern country houses place the pool on the ground floor of the premises on the plot next to the house. Despite the financial costs and time for maintenance, the health benefits of the pool, as well as the variety of leisure activities through taking water procedures or playing with children, are a very powerful argument in order to arrange a pool at home.The number of pools is increasing and the number of pools built with defects is also increasing. it may be because use low-quality construction materials and reduce their volumes, perform work by unskilled employees, violate the requirements of construction documents of the project. therefore it is necessary to carry out construction and technical examination.

Keywords: construction, swimming pool, construction and technical expertise, regulatory documentation, defects

Urbanization and increased production have led to the fact that every year the world generates a large amount of plastic waste, which pollutes the environment. Using them in the construction industry will help solve this problem, as well as get profitable solutions in the production of building materials and mixtures.

Keywords: plastic waste, environment, construction, construction materials

Currently, in the design and manufacture of steel products operating in conditions of heavy impact-abrasive wear, not only material is given, but also the structure of the product itself. One such detail is the friction wedge of a freight wagon trolley. In the presented work, a new design of the friction wedge of the vibration damping unit is presented; technical calculations are carried out on the strength of the presented design. The safety factors of spring suspension are calculated. All calculations were performed according to the standards for the calculation and design of new and modernized railroad cars of the Ministry of Railways 1520 mm gauge. The performed calculations indicate the high performance of the developed design, the obtained values ​​fully satisfy the requirements for such products. The result of the work on creating a new design of the friction wedge of the vibration damping unit is to obtain a patent for utility model No. 194823, a drawing has also been developed (KI-000.00.00.001) and terms of reference for experimental design work (KI-000.00.00.001 TK).

Keywords: friction wedge, vibration damping unit, freight car truck, strength, reliability, durability, calculation of spring suspension, static deflection of spring suspension, coefficient of structural margin of deflection, coefficient of relative friction

hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration.

Keywords: hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration

The effective use of high-strength reinforcement in reinforced concrete structures is an important task today. In order to reduce the consumption of materials, especially steel, it is necessary to use high-strength materials more widely in the production of reinforced concrete structures. In recent years, researchers have significantly increased interest in reinforced concrete structures with mixed reinforcement. To determine the effect of the concrete class on the bearing capacity of reinforced concrete columns, a numerical experiment was performed. According to the results of the experiment, it was found that the maximum increase in bearing capacity with all variants of relative eccentricity is observed in racks with previously stretched and non-tensile reinforcement. Thus, the studies showed that the use of columns with mixed reinforcement is advisable. The use of mixed reinforcement in reinforced concrete racks in all cases is more effective than racks with non-tensile reinforcement.

Keywords: concrete, reinforcement, reinforced concrete, prestressing, the relative eccentricity, mixed reinforcement, column, bearing capacity

In the view of most people, the criterion "high-rise buildings" is very blurred. Five or seven storey buildings were considered one or two centuries ago to be tall, but now you will not surprise anyone with a number of storeys over fifty. Russian law sets the maximum possible 75-meter height for residential buildings and 50-meter - for public buildings. The construction of higher facilities is subject to special requirements. The article discusses the development of high-rise buildings of a megalopolis using the example of the city of Rostov-on-Don, presenting famous high-rise buildings in Rostov at present. Along with increasing the number of storeys of buildings, their design features are also changing. The types of structural schemes of high-rise buildings, the materials of the supporting structures of high-rise buildings, their advantages and applications are described. The problems that arise in high-rise construction are described.

Keywords: Rostov-on-Don city, high-rise construction, number of storeys, development, urban planning, zoning, architecture, design, high-strength concrete, high-strength reinforcement

In the work it is proposed to use the principle of zonal placement of materials in prefabricated-monolithic bending structures with the use of light concrete, as well as combined reinforcement. The upper (monolithic) layer is preferably made of light concrete of low strength, and the lower (prefabricated elements) - of steel fibre concrete based on light concrete of higher strength. Rod and fibre reinforcement are located in prefabricated elements, which under operating loads will be in stretched zone of bent elements.The results of experimental studies of crack resistance and deformation of steel-fibre-fluorophobetone (SFTB) prefabricated monolithic bending elements on the basis of shoe filler of Kamenskoe deposit of Kabardino-Balkan Republic are presented in the work. Based on analysis of obtained data correlation dependence is derived and character and degree of influence of various factors on crack resistance and deformability of assembled monolithic combined reinforced bending elements is revealed. The following conclusions have been drawn: reinforcement of prefabricated elements of flexable monolithic structures made of tuphobetone with rods and fibres allows to significantly increase their crack resistance; Parameters of combined reinforcement of prefabricated elements, assignment of their geometrical dimensions, as well as dimensions of sections of bent prefabricated-monolithic structures from tuphobetone as a whole can be assigned taking into account correlation dependencies for evaluation of crack resistance obtained from the results of these studies.

Keywords: Stalefibrotaphobetone, monolithic assembly, zonal arrangement, combined reinforcement, reduced reinforcement, strength of monolithic concrete, correlation dependence, crack resistance, deformability, factors, parameters of combined reinforcement

issues of optimization of the structure of the container pneumatic transport system are considered. The expediency of combining the functions of the equipment included in the transport system is shown. A functional diagram of a universal module that performs the functions of all blocks of a pneumatic transport system is presented. A block diagram of a microprocessor control system that provides the functioning of the mechanisms of a universal module is proposed.

Keywords: microprocessor system, pneumatic transport system, transport container, stations of the transport system, control algorithm, structure of the transport system, transport pipeline

An idea is introduced of the directing structures of the director and reflex types that contribute to the formation of air flows, which in a given way contribute to an increase in mechanical power on the shaft of its rotor. These structures can be used to amplify the moment on the rotor shaft by increasing its useful interference with the stator. Qualitative considerations about the influence of the introduced guide structures are confirmed by the introduction and numerical aerodynamic calculations of two modernized designs of a promising vortex wind power installation, considered in the previous works of the authors. The most optimal variant of rotor modernization was selected, which made it possible to increase the power on its shaft by an average of 45% relative to the corresponding power for the design of a wind turbine with an initial rotor shape in the operating range of wind speeds from 1 to 12 m / s. The materials of this article can be used to design the optimum aerodynamic power criterion for the rotor of wind power plants, their stations, as well as integrated power power plants, including a wind power plant as one of the renewable sources of energy.

Keywords: wind power installation, airflow structuring, director-type guide structure, reflex-type guide structure, vortex structure, rotor aerodynamic torque, aerodynamic optimization by the criterion of maximum power, numerical aerodynamic calculation, sliding gr

This article discusses such technology as the Internet of Things and the network control system for remote identification of RFID tags. In the course of the work, the most popular microcontrollers to date were considered, a comparative characteristic was carried out, and the efficiency of use was evaluated, during which the most optimal option for further work was selected. As a result, a system for remote identification of RFID tags was developed, namely, the design of the system and application software, with the ability to obtain information on RFID tags from both PC and smartphones, and the results of use on different operating systems are presented.

Keywords: Internet of Things, microcontroller, NFC module, Arduino, protocol, MQTT, RFID tag, software, data transmission, identification

This article reviews the process of glider motion control system development based on position-trajectorial controller, developed by V.Pshikhopov. A mathematical model of an underwater glider is reviewed briefly, this model uses variable buoyancy for movement. Control system uses position-trajectorial controller which uses two controll variables for straight gliding and turning. The article contains results of modelling the motion control system in various modes such as straight gliding, gliding with turning and following a set of points. A brief description of practical usage of the control system is given.

Keywords: glider, control system, position-trajectorial controller, motion control, mathematical modelling