For the statically indeterminate systems under consideration, there is an optimal ratio between the load-bearing capacity of stretched and out-of-center compressed elements, in which the required reliability will be provided at the lowest value of the mathematical expectation of an external destructive load. It should also be noted that for statically indeterminate systems, the beginning of rebar fluidity is not a sign of destruction, but only indicates the beginning of an intensive redistribution of forces in it. Therefore, the values of C, do not refer to the beginning of the rebar flow, but to the complete exhaustion of the load-bearing capacity. The reliability of statically undetectable systems, including prestressed trusses, is always higher, all other things being equal, than that of statically definable systems.

Keywords: reinforced concrete, reinforced concrete structures, statically indeterminate systems, reliability

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

A method for determining the optimal value of the heat transfer resistance of a three-layer exterior wall of a country cottage building is presented. As an optimization criterion, the specific consumption of thermal energy for the weekly cycle of operation of the building is selected. As a result of the study of the function describing the total specific energy consumption for heat loss compensation and heating of 1 m2 of the outer wall, an analytical expression was obtained to determine the optimal value of the heat transfer resistance. Based on the obtained solution, the thickness of the monolithic expanded clay concrete used as a structural and thermal insulation material in the outer wall is optimized. An analytical relationship is obtained to evaluate the energy-saving effect due to additional insulation of the outer wall of a country cottage.

Keywords: intermittent heating, heat transfer resistance, enclosing structure, energy consumption, heat protection characteristics

The object of the research, the result of which is the presented work, is a comprehensive system of spatial data of the railway infrastructure, within which a high-precision system of coordinates of the Russian Railways has been created, and methods definition of normal heights in the Baltic Heights System 1977. The strategy and prospects for the development of high-speed transport highways (VSM) have been described. Methods for determining normal heights at research sites are given.

Keywords: monitoring, buildings, facilities, engineering and geodesic research, laser scanning, GNSS receivers, design, construction, observations, geodesic measurements

The paper presents studies of the state of biologically active filtering material - vermicompost in the working area of ​​the aeration station at closed sewage treatment plants with an increased concentration of sulfur dioxide. The assessment of the filtering sorption properties was carried out using bioindication methods, namely, germination of test seeds under conditions of an increased content of sulfur dioxide. The bioindication method is considered fast and accurate, it allows to obtain reproducible results.Oat seeds, wheat seeds - representatives of monocotyledonous plants, as well as radish seeds - a dicotyledonous plant, were used as test seeds, as they are highly sensitive to harmful effects. The experiment took place in four stages with different time intervals. The indicator is the average length of development of the root system in the tested water compared to the control. The results showed that 60% of normal germination was recorded in monocotyledonous seeds, and 90% of normally germinated seeds were recorded in dicotyledons. According to the well-known method, the non-toxic properties of vermicompost was assessed based on the lengths of shoots and seed roots, which can be used as a load in installations for the biochemical purification of gases emitted into the air of the working area from closed wastewater treatment facilities. Such an installation can be a biofilter. Thus, the thickness of the load, the height of each of its constituent layers, affects the degree of its efficiency.

Keywords: sulfur dioxide, bioindication, closed treatment facilities, waste water, test seeds, germination of seeds, vermicompost

The possibilities of using volcanic tuff as an additive in pressed cement-mineral composites intended for road construction are studied. The influence of low-modulus mineral additives of trepel, granulated blast furnace slag and volcanic tuff on the physical and mechanical properties of hardened composites is studied. The rational compositions of the molding masses of the optimal structure of cement-mineral composites providing the improvement of physical and mechanical properties are determined.

Keywords: small-piece pressed products, hard pressing, cement-mineral composites, paving slabs, screenings, volcanic tuff, trepel, granulated blast furnace slag, structure-forming additive, decaying strength

The design documentation was developed, the layout was made, and an experimental study of the direction-finding receiver was conducted. A functional diagram and a description of the design are given. The method of the experiment is given. Shows the achievement of the following parameters: operating frequency range: centimeter; the dynamic range of the signals at the entrance 48 dB; the duration of the received pulses is not less than 0.1 µs; the irregularity of amplitude-frequency characteristics of not more than 5 dB.

Keywords: direction finding receiver, logarithmic receiver, amplitude-frequency response, amplitude response, dynamic range

A model of passenger traffic movement is proposed that is suitable for identifying hidden patterns in the processes of passenger flow creation. The passenger flow is divided into four components, for which separate passenger flow submodels are developed: quasi-deterministic passenger flow from leaving stops to points of mass attraction of passengers; stochastic hourly passenger flow from each arrival stop to different districts of the city; stochastic flow that models the distribution of passengers between final stops in accordance with the degree of popularity of stops; chaotic distribution of passenger traffic between stops with a small number of daily visits. The results of calculations of the quasi-deterministic passenger traffic submodel from leaving stops to points of mass passenger attraction are estimated.

Keywords: passenger transport, passenger traffic models, passenger behavior patterns, modeling

The article discusses the work of foreign authors in the field of solving fuzzy distribution (transport) problems. To solve such problems in real conditions, it is rather difficult to formalize all parameters in the form of definite numbers, therefore, the field of solving fuzzy distribution (transport) problems attracts wide attention of scientists and experts, provoking numerous successful studies. To solve distribution (transport) problems, when considering the current state of foreign literature, the main approaches have been identified, consisting in the use of pentagonal, hexagonal, octagonal fuzzy numbers, ranking, intuitive fuzzy environment, as well as the Pythagorean approach. Now it is becoming more and more important to use inaccurate data in real transportation problems. The listed approaches to solving distribution (transport) problems give a certain effect in comparison with the existing ones, therefore it is necessary to investigate solutions of fuzzy distribution problems using modern approaches and methods.

Keywords: fuzzy transport routing problem, optimization, fuzzy methods, fuzzy numbers, heuristic algorithms, hybrid algorithms

The work was carried out due to the fact that the regulatory documents used in the design of structures operating at elevated and high temperatures do not take into account the peculiarities of the mineral composition and structure of concrete aggregates. This is a disadvantage of these documents, since the mineral composition and structure of aggregates can differ significantly even for materials of the same name, which can significantly affect the thermal changes in concrete. Due to the impossibility of experimentally investigating all the variety of concretes based on aggregates of various mineral composition and structure, a computational and analytical study was carried out in the work on the basis of existing methods for the analytical determination of thermal changes in concretes and their components. On the basis of these methods, the effect on the thermal expansion of concretes of the presence and amount in the aggregates of the most expanding minerals (aragonite, calcite, quartz, cristobalite, potassium feldspars, pyroxenes) and glass, as well as the average size of crystals composing mineral fillers, has been calculated and investigated. Considered are heavy Portland cement concretes on aggregates of limestone, dolomite, granite, syenite, diorite, basalt, diabase, broken clay brick, chamotte and slags. Based on the calculations, it has been established that the values of the thermal change in the volume of concrete, determined according to the normative document SP 27.13330.2017, coincide with the calculated values only for certain combinations of the mineral composition and structure of aggregates in terms of crystal sizes. In other cases, the actual thermal expansion of concrete may be less and more than the values obtained according to SP 27.13330.2017. The regularities of the influence on the thermal expansion of concrete of the content of various minerals and the average size of the crystals of minerals in the aggregates are established.

Keywords: thermal expansion, conventional and heat-resistant concretes, aggregates, minerals, glass, the effect of the mineral composition and structure of aggregates

The problem of increasing the coding and decoding speed of Reed-Solomon codes (RS-codes) is considered. The implementation of the Open JPEG encoding system library was chosen as a base implementation for comparison. This task is considered for an x86-64 environment. The paper proposes ways to improve performance both when using a standard set of instructions and when using vector instructions from the SSSE3 and AVX2 sets. A technique for comparing the speed of encoding / decoding RS-codes is described using the example of the developed library and the basic implementation in Open JPEG. An experimental study of the relationship between the parameters of RS-codes, the encoding / decoding rate, and the set of instructions used is carried out. It is shown that for any RS-code it is possible to significantly increase performance even on a standard set of instructions. A method is proposed for the dynamic selection of the encoding acceleration method depending on the instructions supported by the target computer and the parameters of the used RS-code.

Keywords: anti-noize coding, Reed-Solomon codes, speed, vector instructions

The article offers schemes and models that allow using formal parameters and procedures to expand the capabilities of cognitive modeling and increase the level of adequacy of decisions made based on the results of modeling. The paper presents various variants of modeling schemes, which allows the researcher to perform a more versatile analysis of the system, including the analysis of dynamic effects, as well as the selection of parameters of control actions that provide the desired level of system response.

Keywords: dynamic influence, control, simulation, formal cognitive model, formal neurocognitive network of f-euroconcept

The article deals with the laws of distribution of pollutants in a linear city. The highest values of carbon monoxide concentration were determined in the near-main territories of the Krasnoarmeysky district of Volgograd. Also in this paper, the question of the dependence of the level of gas pollution in the mainline areas on various factors, which include human activity and natural, natural factors, is raised. The influence of temperature inversions on the speed of pollution propagation and their limiting value in various points of the city is considered. For the experimental part, 18 points of technical measurements of CO concentration were taken, during which compliance with the MPC standards of the samples taken was revealed.

Keywords: linear city, district, law of distribution of carbon monoxide, transport of impurities, air pollution

Based on the results of engineering and geological survey of real construction sites in Rostov-on-Don and the Republic of Kalmykia, the dynamics of subsidence processes on laboratory samples of loess soil tested for compression according to the "one curve" scheme according to GOST 23161-2012 was studied.

Keywords: subsidence, compression compression, odometer, loess soil, subsidence pressure, surveys, geomechanics, soil mechanics

This article describes the methods used to improve the management of construction design; the difference between the traditional and modern method, the problems encountered by the design at the time of execution, their consequences but also the importance of modeling building information and automating design processes as an effective method of improving organizational and technological management processes of designing a residential building.

Keywords: construction design, collaboration, cooperation, coordination, design processes, design managers, improvement, productive, controlling, quality, asynchronous, synchronous