The main provisions of the methodology for modeling organizational risks inherent in domestic companies are considered, while taking into account such important factors as the likelihood of an accident and the severity of possible consequences. It is advisable to identify organizational risks of companies and assess them before the onset of consequences; for this, indicators are presented that help prevent the occurrence of adverse events. The onset of adverse events leads the company to deviations in the main indicators characterizing the activity. The scientific problem that requires scientists to solve is the emergence of organizational risks at the strategic and tactical levels of companies, due to fatal mistakes of management. The scientific novelty of the presented research: the main provisions of the methodology for modeling the company's organizational risks are formulated; indicators are shown that contribute to the prevention of adverse events. Further research is related to the development of methods for assessing organizational risks by domestic companies, taking into account the specific, geographical features of doing business.

Keywords: organizational risks, indicators, factors, company, modeling, probability, assessment, methodology, results, events, consequences, indicators, business

When designing engineering structures, the efficiency of the engineer’s work is important. The cooperation between individual programs in BIM technology is very important in this aspect, because it significantly speeds up the work and, as a result, the design process is less time-consuming. In the process of designing steel structures, the first stage is the selection of an appropriate structural solution, then numerical calculations of the model together with all assigned load cases and dimensioning of individual elements of the structure in terms of the ultimate and serviceability limit state. After selecting the appropriate sections, you can start working on the detailed drawings of a given structure. When performing numerical calculations and drawings, at least two programs should be used. The article presents the cooperation between the Dlubal RFEM numerical calculation program and the Tekla Structures building structure modeling program on the example of a steel structure floor design.

Keywords: BIM, Dlubal RFEM, Tekla Structures, steel structures, direct import, engineering structures

When building complex technical systems, as a rule, the resources of an existing system are used as a basis, which may be redundant due to the lack of a clear definition of what the system is needed for. This necessitates the determination of the system intended purpose, the selection of elements for its construction and management in the process of its operation, aimed at achieving the intended purpose and optimizing the resource support used to build the system. The paper proposes an approach to building a system based on the development of its functioning profile, which characterizes the achievement of its intended purpose, modeling the process of a complex technical system functioning and evaluating the effectiveness of the profile. The use of the proposed methodology will allow, at the stage of building a complex system, to improve the quality and efficiency of designing a complex technical system by taking into account the functional needs of the system, as well as determining the amount of resources required to fulfill them.

Keywords: profile, complex technical system, criticality, system design, system construction, control process automation, functions, tasks, resource

The article considers the work of a reinforced concrete beam lying on an elastic half-plane. The strength of concrete is considered as a random variable, while the initial modulus of elasticity of concrete and, accordingly, the initial stiffness of the beam are taken as functions of the random cubic strength of concrete. The base of the beam is considered as an elastic stochastically inhomogeneous half-plane. Using the method of canonical expansions of random functions, the probabilistic parameters of the probability distribution densities of beam deflections, as well as bending moments and transverse forces in a reinforced concrete beam, which are non-stationary random functions, are obtained. This makes it possible to further determine the probability of occurrence of limit states in a reinforced concrete beam.

Keywords: reinforced concrete beam, initial stiffness, cubic strength, inhomogeneous half-plane, distribution density, beam deflection, random function

The article discusses modern methods for protecting load-bearing structures from progressive collapse, as well as methods for their calculation in extreme conditions, in order to ensure the safety of buildings and structures, reduce material damage and minimize human casualties as a result of emergency situations. The main purpose of the work is to identify the imperfections of existing methods for calculating building structures against progressive collapse, regarding multi-storey residential complexes, which are characterized by girderless frames, which have significant architectural advantages, as well as revealing the inaccuracies of empirical formulas used in practice for determining the coefficients of dynamic strengthening in tension and compression, which entails a calculation that does not correspond to the actual work of structures.

Keywords: beamless frame, progressive collapse, protection measures, calculations, dynamic coefficient, dynamic strengthening coefficient

This article discusses the possibilities of BIM technologies for predicting, responding to and eliminating the consequences of natural and man-made emergencies. BIM systems make it possible to simulate various scenarios in the event of an emergency and choose the most effective and safe solutions to minimize human and material losses, and improve the level of managerial decision-making during evacuation. Modern technical means used in conjunction with BIM technologies make it possible to acquire knowledge and practical skills as part of the training of rescuers and other specialized services.

Keywords: BIM technologies, BIM model, emergency, flood, fire, 3D laser scanning, restoration work

Co-branding contributes to the creation of more successful products. Purposeful formation of the image of an architectural object, that is, its brand, consists of three parts. Its creation involves the brand of the organization or organizations located in the building, the brand of the author or authors of the project, and the brand of the place. These three components can manifest themselves in different ways in an architectural object. Studying the issues of joint branding of architectural objects and understanding this process is important not only for architects and developers, but also for other professionals. The realization of the possibilities hidden in this area contributes to the creation of a holistic image of an architectural object.

Keywords: building image, place brand, building brand, architecture, co-branding, logo, trademark

This article is devoted to some features of the performance of engineering and technical inspection of chimneys made of brickwork. The relevance of this research topic is due to the presence in our country of a large number of functioning chimneys made of brickwork, whose age exceeds 50 years, while a clear algorithm for performing surveys, taking into account all possible types of defects and features of performing verification calculations of these structures has not yet been developed. The author of the article substantiates the relevance of this research topic, presents the types of defects characteristic of brick chimneys, and also briefly describes the features of performing verification calculations of these structures when performing their engineering and technical surveys.

Keywords: inspection of building structures, exhaust shafts from brickwork, chimneys, brickwork, flaw detection of chimneys, flaw detection of building structures

The application of the gas-dynamic method with the use of nonlinear dynamics to the calculation of an underground structure built into the lower floor on the impact of an air shock wave is considered, taking into account the collapse of the above-ground part of the building. It is known that one of the impacts on built-in underground structures designed to protect the population and territory from natural and man-made emergencies is the impact of a possible collapse or blockage from a higher building when exposed to an air shock wave. This task is relevant because the current methods are based on linear static calculation methods and involve certain assumptions, including when calculating for collapse, and all this can lead to difficult to estimate errors in the calculation results. Therefore, when solving these problems, which are highly non-linear and the processes under consideration themselves are fast, it is necessary to consider the use of more adequate and accurate methods based on more rigorous formulations, which is the gas-dynamic method using nonlinear dynamics.

Keywords: emergency explosive effects, air shock wave, impulse effects, non-linear gas dynamics, compression phase, rarefaction phase, underground structures, “Ambient” elements, Eulerian grids, progressive collapse, collapse of structures, destruction of structure

The design of new buildings and structures is currently a complex and multifunctional process divided into several main stages. A large number of design organizations engaged in the development of large investment and construction projects are constantly improving their activities in order to optimize production costs and increase the efficiency of design solutions. The development of new approaches that are beginning to be applied in design is very slow, which is explained by several reasons. These include a narrow range of software, the lack of a methodology that combines digital technologies and the principles of "lean" construction, which provides savings in consumed materials and resources, as well as shortening the design and construction of the facility. In this regard, consideration of issues related to the development of a new concept combining the principles of digital design and "lean" construction is currently very relevant.

Keywords: lean construction, digitalization, project, building, design

Currently, the processes of designing buildings and structures are becoming more costly, as they require the involvement of more specialists, material and technical resources and a reduction in the calendar time of work. At the same time, the customer of the project requires optimization of design solutions in order to preserve the quality of the work carried out. In this regard, there is a need to develop a special design methodology, based on which it is recommended to use the principles of "lean construction", which can reduce the Customer's losses during project development.

Keywords: project, building, construction and installation works, losses, work schedule

Experimental studies of the effect of the intensity of mixing of mineral coagulants with water on the efficiency of water treatment in different periods of the year have been carried out. The studies were conducted in June-August - low-turbidity water with relatively low color and high temperature; November-December - low-turbidity and low-color water with low temperature; flood in April-May - increased turbidity and color of water with low temperature and alkalinity. The results obtained allow us to evaluate the effectiveness of the use of concentrated coagulation, high-gradient mixing in water purification with mineral coagulants. The possibility of separate and joint use of mineral coagulants in different periods of the year was assessed.

Keywords: natural water, coagulant, concentrated coagulation, high gradient mixing, mixed coagulant, velocity gradient

The article describes four developed designs of samples of joints of solid wood elements on aluminum linings. They made it possible to simulate the operation of real connections of the main and secondary beams, as well as crossbars and columns. Tests of connection samples were carried out, one of the four developed variants of sample designs was selected that most fully reflects the actual work of real joints of wooden elements. The strength and deformation characteristics of the joint, the upper boundary of the elastic work area (VGOUR) of the joint are determined. Based on the conducted research, the peculiarities of the work of the studied compounds were determined, a sample of the connection of a wooden element with a metal overlay was developed, which allowed the development of measures aimed at increasing the bearing capacity and reducing the deformability of the studied compounds without significant material costs associated with the purchase of expensive SHERPA linings.

Keywords: solid wood, metal slips, testing of joint specimens, joint bearing capacity, joint deformability, upper limit of the elastic work region, full deformation, permanent deformation, elastic deformation, safety factor

The article presents the results of the calculation of a steel truss with parallel belts with a span of 36 m for the second group of limit states, taking into account the selected share of the temporary snow load duration. The comparison of the results of determining the vertical displacements of the steel truss structure nodes under the action of permanent and temporary snow loads is carried out.

Keywords: truss, calculated combination of loads, modulus of elasticity, stiffness, fraction of duration, deflection, CAD

The article considers the method of applying dynamic effects on cylindrical mesh roofs. The necessity of taking into account oscillatory processes from operating devices and in case of mechanical failure of the attached equipment is justified. The features of the construction of structures and the location of static loads are taken into account. A specific numerical example is given in the framework of application software application. A rational grid shape with a diagonal element in the middle is adopted and acceptable ratios of geometric parameters are obtained. The defining mathematical dependencies are indicated and the dynamic load modeling process is shown. Direct integration of the equations of motion is carried out. The regularities of the influence of oscillatory processes on the operation of the roof are revealed and a visual visualization of the results is obtained. Extreme values of force factors and parameters of deformation of the structure at a given time interval are recorded.

Keywords: cylindrical mesh roof, direct integration of equations of motion, dynamic impact, force factor, deformation parameter

The overlapping time of the layers during the layer-by-layer laying of the concrete mixture during the construction of massive monolithic reinforced concrete structures is an important technological parameter of concreting, linking the rate of concreting, the thickness of the laid layers and the design parameters. For traditional concrete mixtures compacted by vibration, this parameter is determined by the persistence of the concrete mixture, taking into account its temperature. When using self-compacting concrete mixtures, the time of overlapping layers, in addition to traditional factors, significantly depends on the period of formation of the "elephant skin". The influence of the overlapping time of the layers on the strength of their adhesion, depending on the properties of the concrete mixture and the method of its laying, was studied. The ultimate tensile strength in bending was used as a criterion for adhesion strength. It has been confirmed that when using a traditional concrete mix compacted by vibration without superplasticizing additives based on polycarboxylate esters, the overlapping time of the layers of 2 hours provides a seam of equal strength with the main body. For self-compacting concrete mixes using vibration when laying subsequent layers after the first, the overlapping time corresponds to the storage index and increases to 6 hours, and when layered without vibration, the adhesion strength decreases by about 20%, 70% and more than 90% with an overlapping time of 2.4 and 6 hours, respectively.

Keywords: self-compacting concrete mixes, massive reinforced concrete structures, overcoating time, "elephant skin"

The work of new Russian regulators RED is being considered. The results of a study of the compliance of regulators with the declared class of locking pressure using the "PLEXOR" installation are presented. The conducted tests show that Russian gas pressure regulators in the conditions of import substitution are not inferior to foreign analogues in their technical and functional characteristics.

Keywords: gas reduction point, pressure regulator, locking pressure class, diagnostics, setting limits

Carrying out work on the inspection of buildings and structures is a set of measures aimed at identifying the actual condition of the object. Since the work on the inspection of buildings includes the work of various specialists, various problems arise related to the incorrect organization of the work. This article is devoted to the identification of the main elements of deadlines, with a reserve for the further development of a tool to reduce the impact on the timing of work.

Keywords: inspection of buildings, interaction of specialists, organization of work, non-destructive methods for determining the strength of concrete, project management

The issues of seasonal unevenness of gas consumption for the needs of heating, ventilation and hot water supply of the shopping and leisure complex are considered. Calculations of volumetric and power indicators of uneven gas consumption for 2020-2022 are given according to the data of the archive of gas consumption meters.

Keywords: gas consumption, uneven gas consumption, volume, capacity indicators, shopping center

The variety of options for construction of inverted roofs with exploited roof coverings necessitates an analysis of structural and technological solutions at the stage of variant design of exploited roofs. At present, there is no comprehensive assessment and analysis according to a system of criteria that sufficiently fully characterizes the design of the roof on a structural and technological basis. The study evaluates three basic grouped and systematized options for inverted roof construction (with supports, without supports and rooftop parking) by a system of criteria for an exact evaluation of the efficiency of a roof in construction projects using expert analysis. The proposed system of evaluation criteria makes it possible to determine the optimal solutions for inverted roofing in a practice of building construction in case of variant design.

Keywords: inverted roof, exploited roof, exploited coating, variant design, system of criteria, systematization, structural and technological solution, evaluation of options, expert analysis, mathematical modeling, optimality, efficiency

The article is devoted to the assessment of the organizational and technological documentation of construction, the possible four groups of indicators that are necessary to obtain a qualitative assessment developed by the CTD are considered. A possible technique for determining the quality of CTD is given. A method of expert assessments is proposed to obtain the weight characteristics of the identified indicator. The description of the term "system" as a fundamental element of construction is given.

Keywords: design, quality indicator, system, systematic approach, groups, organizational and technological solutions, indicators, organizational and technological documentation

Cities are born, grow, develop and, of course, age. The older the city, the more often it faces the problem of dilapidated housing stock. The desire to improve the urban environment requires a solution to this problem. Currently, two main directions are used: reconstruction (by which we mean improvement, modernization, but preserving the structures and the existing planning concept) and renovation (demolition and new development). An analysis of urban planning practice in the regions of the Russian Federation made it possible to establish that in 98.7% renovation is used to solve the problem of obsolete housing stock. In the course of visual observation, field study of the renovations carried out, approaches to obsolete buildings, urban planning and, in correlation with them, social problems that cause a deterioration in the level of comfort of the urban environment were identified.

Keywords: reconstruction, renovation, urban planning, dilapidated housing, sustainable development of the city, old housing stock, urban environment

The construction complex should become one of the main drivers of the Russian economy's recovery from the crisis. In order for the industry to achieve maximum returns, it is also necessary to reduce administrative barriers as much as possible. The reform of control and supervisory activities in the Russian Federation is aimed at accident-free, both construction and operation of facilities under construction. An example of the correctness of the appointment and compliance with the requirements of technical regulations, the results of engineering surveys at a site with complex engineering and geological conditions is considered: seismicity, subsidence for compliance of engineering surveys with the requirements of legislation, technical regulations, design and regulatory documentation.

Keywords: control and supervision activities, requirements of technical regulations, complex engineering and geological conditions, engineering surveys

The method of determining crack-forming forces based on the normative approach is considered. Experimental and theoretical studies of reinforced concrete beams made of ordinary heavy concrete, self-compacting concrete with a modifier and concrete of a frame structure have been carried out. Formulas for determining the tensile strength and flexural strength depending on the compressive strength for each of the considered types of concrete are given. The calculated values of the ultimate extensibility of various concretes determined by various methods are given. Coefficients to the formula linking the reduced and initial elastic modulus of various types of concrete are obtained. The influence of the accuracy of the experimental determination of the moment of cracking on the change in the calculated dependencies is analyzed.

Keywords: cracking moment, flexural and tensile strength, frame structure concrete, self-compacting modified concrete