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

A review of publications by Russian and foreign researchers on the issues of modeling the process of assessing the degree of security of individual components of an informatization object (automated system) is presented. The main factors influencing the level of security are analyzed. The types of objects of unauthorized influence are given. The choice of the “information carrier” as the main generalized object and the list of actual threats to it are substantiated, their brief analysis is given. As the output (dependent) variable of the developed regression model, the level of information carrier security is determined. The input (independent) variables are the degree of danger of threats: illegal access to protected information; unauthorized copying of protected information; overcoming physical protection; loss of carriers of information. The developed model has the form of a regression equation and can be used to predict the level of security of information carriers.

Keywords: information security, informatization object, automated system, information carriers, information security threats, security level, regression model, expert information, adequacy criteria

This article presents the main achievements of the foreign engineering school in the field of research and application of composite materials to reinforce wooden structures. Some options for reinforcing glued and solid wooden elements are considered. The results of tests of reinforced wooden structures are analyzed. Errors made during the manufacture of samples and the course of testing are noted. Conclusions are drawn on the basis of the conducted research.

Keywords: wooden structure, prestressing, composite beam, tensile zone, carbon nanotubes, load-bearing capacity, epoxy matrix, carbon fiber, lamella, rebar, wood collapse

The paper is focused on the building heightening technologies employing modular structures, and in particular, three-dimensional units. It lists the global leaders in the field of manufacturing of three-dimensional/modular units and examines the work stages based on the analysis of scientific publications and patent searches. It is noted that the process arrangement upgraded to the current state of the art and the improved energy efficiency performance of a superstructure are mainly achieved through the use of modular units with greater dimensions but with a lighter weight.

Keywords: reconstruction, technology, energy efficiency, superstructure, modular constructions, volume blocks, organizational and technological solutions

This paper is a follow-up on the first part, which also reviews the process arrangement solutions for building reconstruction based on building heightening using modular structures. It highlights the importance of the use of transformer (stacked) modules, which allows improving the work process flexibility at the installation and transportation stages. It is further specified that, if reconstruction is carried out in congested urban environments, three-dimensional/modular units should be prefabricated, as prefabrication helps to significantly reduce a gap between the actual and standardized work timelines, even in case of force majeure.

Keywords: superstructure, organizational and technological solutions, transforming three-dimensional blocks, assembly and transport manufacturability

The article considers the concentration dependence of dust particles PM2.5 and PM10 on a curb stone on a number of influencing parameters. According to the data of field measurements, a quadratic regression equation was compiled, according to which the factors that have the greatest influence on the spread of fine dust near the roadway were determined. The results of mathematical processing of experimental data are presented in the form of a graph of the confidence area of the observed and predicted values constructed using the STATISTICA software product.

Keywords: PM10, PM2.5, fine dust, roadway, linear city, concentration dependence

This paper presents the results of a study of the interaction of the wheel tire with the support surface of the support-running module during the movement of the wheeled vehicle. The creation of a mathematical model of the movement of the wheel on the support base of the support-running module is given. For this, a design scheme for the movement of the wheel along the supporting surface of the support-running module was presented, and the following equations were given: the dynamics of the drive wheel; normal reaction and reaction vector of the interaction of the wheel tire with the support base; partial slip friction coefficient for cohesive soils and slip coefficient. Simulation modeling was carried out using the MATLAB Simulink environment, which allows, on the basis of a given mathematical model, to study the system being developed. When using this system, there is a reduction in the cost of expensive physical prototypes and an increase in the quality of products, as a result of an increase in the accuracy of calculations.

Keywords: wheel tyre, suspension module, wheeled vehicle, MATLAB Simulink, mathematical model, modeling

The forecast of fine dust pollution, the organization of monitoring and quality control of the air environment are relevant for cities with a developed transport infrastructure. The article checks the application of the distribution law for the concentration of fine dust PM2.5 and PM10 for highways of urban, district and local significance, the sample size was 50 values.

Keywords: linear city, distribution law, fine dust, roads, mixed gaussian distribution