The purpose of this article is to conduct a comparative analysis of methods for assessing the technical condition of buildings and structures. The article considers various approaches to assessing the technical condition of buildings and structures, reviews and compares methods, identifies key differences between the foreign approach and the domestic one. The review of methods for assessing the technical condition presented in the article allows us to conclude that a variety of methods can create certain difficulties when choosing and using them. The analysis of domestic and foreign experience has shown that the most popular today are systems for monitoring the technical condition of buildings and structures, involving a set of measures using modern assessment, modeling and forecasting technologies that allow obtaining operational information about the technical condition of buildings.

Keywords: physical wear, operation, technical condition assessment, monitoring, operational qualities, instrumental examination, expert-normative method, cost compensation method

The article discusses the organizational aspects of the inspection of building envelopes and structures within the framework of construction and technical expertise using an instrumental measuring method. The implementation of a comprehensive field survey in identifying certain structural defects is necessary, however, the methods used by experts have significant differences in the accuracy of the results provided and the simplicity and ease of implementation, which affects the progress of the work.

Keywords: construction and technical expertise, building structures, quality of construction works, non-destructive testing, destructive testing, inspection methods

An urgent task in the context of digitalization of all spheres of society is to create a system of protection against the negative impact of digital images on the person. The solution to this problem is impossible without assessing the subliminal impact of audio-visual information. The study presents a solution to the problem of systematization of subliminal factors of audio-visual information and optimization of methods to deal with them. Risk factors and limitations as the basis for the design of the protection system at the level of technical.

Keywords: information security, modeling, risk factors, subliminal impact, digital image

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 presents a study aimed at developing methods and algorithms for analyzing spatial data for diagnosing the state of geosystems. It is shown that the combination of machine learning models into an ensemble makes it possible to increase the stability of the analyzing system: the accuracy of decisions made by the ensemble tends to tend to the accuracy of the most efficient monoclassifier of the system. The calculation and consolidation of territorial descriptors at the same time make it possible to reduce the dimensionality of the analyzed data, facilitate the allowable capacity of the machine learning model, increase its resistance to overfitting, and prevent a significant decrease in the classification accuracy within the framework of a specific problem being solved.

Keywords: metageosystems, spatial data, test sites, territorial descriptors, ensembles

The article presents a methodology for multivariate analysis of intercomponent relationships in geosystems, implemented on the basis of two strategies: the use of numerical, including statistical, methods to assess the degree of influence of various parameters on the state of the geosystem model and the use of simulation to assess the dynamic properties of geosystems and solve the problem of spatial forecasting . The algorithm for assessing the importance of geosystemic parameters makes it possible to evaluate the impact of various parameters on the target indicator in the framework of solving design problems. The concept of building simulation systems for solving the problem of assessing the dynamics and forecasting the development of metageosystems is characterized.

Keywords: metageosystems, spatial data, modeling, intercomponent connections

The used mechanisms of management of the construction complex do not provide the desired result in the field of technical equipment of construction. Management of this line of activity is carried out without effective analysis and further planning. Therefore, the creation of integrated organizational structures, with specific tasks facing them, can provide, in the opinion of the authors, a solution to the existing problems identified in the article. It is proposed to create organizational structures of ""Centers of technical equipment of construction"" of two types, the main purpose of which is to increase the level of security of construction with the necessary machines and mechanisms. The used mechanisms of management of the construction complex do not provide the desired result in the field of technical equipment of construction. Management of this line of activity is carried out without effective analysis and further planning. Therefore, the creation of integrated organizational structures, with specific tasks facing them, can provide, in the opinion of the authors, a solution to the existing problems identified in the article. It is proposed to create organizational structures of ""Centers of technical equipment of construction"" of two types, the main purpose of which is to increase the level of security of construction with the necessary machines and mechanisms.

Keywords: centers of technical equipment of construction, machines and mechanisms, a fleet of construction equipment.

The use of information modeling at all stages of the life cycle of a construction object requires a revision of existing approaches to organizing the work of specialists, a more thorough study of the processes of information exchange, the search for new more effective ways of managing information and organizing the use of models. By the period of operation of the constructed object, a significant amount of various data and documents is generated, and during the operation of the building or structure there is a need to collect and analyze significant amounts of information. Damage detection and prediction of structural behavior, search for the current location of a building element can take a lot of time, and a systematic approach to information flow management will ensure an increase in the efficiency of operation services by reducing costs during unscheduled repairs and increasing the life of buildings. This article discusses a model of the integration process of data received or transmitted by Radio Frequency Identification technology tags and data stored and used in an information model. Tags can be placed on critical structures, in complex nodes or on cracks to monitor their disclosure. The approaches to managing information flows depending on the tasks solved at the operational stage, taking into account the preventive maintenance of building elements, are given.

Keywords: radio frequency identification, building information modelling, building maintenance, digitalization, internet of things, industry foundation classes, maintenance and repair, building condition analysis

Тhe article provides a detailed analysis of the work under load structures of clamp scaffolding and systematizes the features of taking into account loads and impacts when performing strength calculations. The article analyzes the stress-strain state of free-standing forests. An algorithm for calculating free-standing forests is proposed, taking into account the features of structural schemes of blocks that are not specified in the normative literature. Based on the results of the analysis of data from a series of numerical experiments, constructive measures are proposed to ensure the load-bearing capacity, rigidity and stability against overturning of spatial blocks of free-standing forests, which will allow installing blocks with a height-to-size ratio exceeding 3,5:1 in open areas (outside buildings and structures) without attachment to existing structures.

Keywords: steel scaffolding, yoke scaffolding, stress-strain state, structural solutions, stability, load-bearing capacity, nonlinear calculation, spatial free-standing block, dismounting, off-center coupling of elements

The work of reinforced concrete racks made of concrete frame structure is analyzed. The conclusion is made about the expediency of using concrete frame structure in reinforced concrete columns.

Keywords: concrete frame structure

The Sustainable Development Goals are becoming increasingly important indicators of the success of investment and construction projects. This is the result of the implementation of various planning and regulatory standards, especially in relation to sustainable development issues, which are currently used to control and monitor the construction process. Moreover, due to the need, construction participants also require its adoption as the main goal of investment and construction projects. In this regard, this article explains value management as a tool to ensure the sustainability of construction in the development and implementation of urban development projects. Various factors that need to be considered before starting a sustainable value management study are discussed.

Keywords: sustainable construction, sustainable development, sustainable cost management, environmental safety, urban development, construction management

TThe modeling of the process of distribution of profile oil pipes in a well by means of a cone punch is considered and the determination of the force necessary for its pushing is carried out on this basis. The normal force for one protrusion of the pipe profile was found. The change in the deformation resistance and profile geometry during distribution is taken into account. The optimal taper angle is determined and the geometric parameters of the punch are selected, including the largest and smallest diameters and its length. A numerical example of calculation based on the obtained formulas is given, which shows the technical feasibility of the process.

Keywords: distribution, oil profile pipes, protrusion force, equilibrium equation, deformation resistance, tool geometry, numerical example

A step-by-step finite element method calculation algorithm of concrete filled steel tubes is provided with an example. A comparison of the finite element calculation results with experimental data, calculations according to Russian (SP266.13 25800.2016) and European standards (Eurocode 4) and the “inverse” numerical-analytical method, which takes into account the actual rigidity of sections, is given as well. The study shows an accuracy of the proposed finite element model using Drucker-Prager model for concrete and the “inverse” numerical-analytical method in comparison with standard calculation methods.

Keywords: finite element method, concrete filled steel tubes, Drucker-Prager model, “inverse” numerical-analytical method, eccentric load

The article presents the results of experimental studies of the operation of mobile wood and metal-wood road pavement and work sites. The results allow to predict with sufficient confidence the stress-strain state of mobile road pavements in real conditions of operation ground as temporary roads, helicopter pads and drilling rig sites.

Keywords: mobile road pavement, demountable plate, temporary roads, static load testing

The process of optimizing the applied sections in steel frames with elements of variable stiffness, formed from rolled I-beams by their diagonal dissolution and subsequent welding, is considered. A table with groups of I-beams according to GOST R 57837-2017 is proposed, which are advisable to be used together to form a monosymmetrical I-beam of variable height. An algorithm for finding the optimal section is proposed, taking into account the discreteness of the assortment. The calculation of a typical building structure code 828KM according to the proposed algorithm is carried out and a comparative analysis of the applied sections with the found optimized sections is presented. The possibility of obtaining a more economical supporting structure, both in terms of metal consumption and in terms of the cost of rolled products, is noted.

Keywords: variable section, variable stiffness, diagonal opening, I-beam, steel frame