The loads on the power floors and column foundations of modern logistics centers can reach 6-9 t/m2 and 1000 t, respectively. At the same time, the step of the grid of exploration wells in the mined areas does not allow reflecting on the geological sections the exact geometry of the occurrence of weak, untreated soils of backfilling pits. The use of a method for strengthening man-made soils by pressing in prefabricated prismatic piles made it possible to compensate for the missing information from engineering and geological surveys by controlling the forces of indentation and thus determining the occurrence marks of more durable foundation soils.

Keywords: engineering and geological surveys, the territory being worked on, man-made soils, soil reinforcement with piles, geological section

The article analyzes the heat-shielding properties of typical curtain-type ventilated façade (hereinafter referred to as CVF) systems used on multi-storey residential buildings in Moscow. We conducted analytical and visual studies, evaluated the technical condition by external features, including photographing the detected defects, thermographic scanning of facades, and took selective measurements of external geometric parameters, distortions, and structural properties for 18 objects in the city of Moscow. The level of defects in the thermal insulation layer at Moscow facilities was at least 50%. A gap of 10 mm at the joint of insulation slabs reduces the heat-shielding properties of the CVF fragment of the outer wall by 14.5–15%. The conclusions were drawn on the basis of the results of calculations of the reduced heat transfer resistance of a total of 18 CVF options from two manufacturers of the Kaptekhnostroy (aluminum CVFS subsystem) and Alfa-Prof (galvanized CVF subsystem) systems. When comparing these solutions, it is obvious that they are all inferior in value reduced resistance to heat transfer of the composite facade thermal insulation system. If the foundation is made of monolithic reinforced concrete or brickwork, the choice of finishing material does not matter. Moreover, the indicators of the reduced heat transfer resistance do not differ significantly. In the case of a base made of expanded clay concrete blocks, the galvanized steel subsystem is 2.9% (ceramic granite), 4.3% (fiber cement) and 4.6% (composite) more efficient.

Keywords: curtain-type facade system, ventilated, facing slabs, fasteners, defects, inspection, heat transfer resistance

The results of the coefficients of iciness for the northern and southern walls, in the attachment points of the frame of the ventilated facade for wall fences made of three-layer reinforced concrete panels with an internal thermal insulation layer are presented. The durability of the anchor attachment of the hinged ventilated facade is determined, depending on the frost resistance of the outer layer of the three-layer wall panel and the orientation of the wall to the north or south.

Keywords: hinged ventilated facade, reinforced concrete three-layer panel, attachment point of the hinged facade, ice coefficients, durability

Ultra high-performance or ultra high-strength concrete is a new class of cement-based materials with increased strength and durability. The widespread use of this concrete in construction practice requires theoretical and experimental studies of the stress-strain state of structures made from them. The article presents and analyzes the shear strength of I-shaped beams made of ultra-high-performance concrete tested by the authors. In the experiments, we varied the fiber content, the shear span, the shear reinforcement ratio, and the width of the compressed flange.

Keywords: shear strength, shear force, ultra high-performance steel fiber-reinforced concrete, I-shaped beams

Modern domestic calculation methods and developed countries for determining the bearing capacity of monolithic reinforced concrete slabs for punching do not fully take into account all factors of design solutions and operating conditions. The available design provisions are made for the static operation of structures and there are no recommendations for taking into account the features of the dynamic impact on the overlap and the nature of the work of the node interfaces. The accepted empirical assumptions of the calculation, based on numerous experimental data, do not take into account the features of the stress-strain state of the coupling of the overlap with the column during destruction according to the punching scheme. This is due to the lack of computational models in which all the acting internal forces ensuring the resistance of the interface to penetration would be considered comprehensively. The complexity of the problem is due to the fact that the sections of the nodal interface are in an inhomogeneous stressed state. The stress-strain state of plates for punching under dynamic load is currently little studied. This article proposes a method for determining the bearing capacity of a symmetrical nodal coupling of a column with an overlap for punching under static and short-term dynamic loading. The proposed design model of the punching strength is based on the following prerequisites: the resistance to punching of a monolithic reinforced floor consists of the shear resistance along the surface of the reduced punching pyramid formed by the height of the compressed concrete zone; the strength of the concrete shear resistance increases due to volumetric compressive forces on the surface of the reduced punching pyramid; the angle of inclination of the faces of the punching pyramid depends on the loading speed. The obtained theoretical dependences are applicable under static and dynamic loading and are in satisfactory agreement with experimental data.problems in the field of video analytics. Numerous studies have shown that, despite the dynamism of processes in the field of information technology and the introduction of various tools and methods, the task of object maintenance still remains relevant and requires further improvement of previously developed algorithms in order to eliminate some inherent disadvantages of these algorithms, systematization of techniques and methods and the development of new systems and approaches. The presented article describes the process of step-by-step development of an algorithm for tracking human movements in a video stream based on the analysis of color groups. The key stages of this algorithm are: the selection of certain frames when dividing the video stream, the selection of the object under study, which is further subjected to a digital processing procedure, the basis of which is to obtain information about color groups, their average values and percentages of their occupancy relative to the object under study. This information is used for the procedure of searching, detecting and recognizing the selected object with an additional function of predicting the direction of movement on video frames, the result of which is the formation of the entire picture of the movement of the person under study. The materials presented in this paper may be of interest to specialists whose research focuses on issues related to the automated acquisition of certain data in the analysis of various images and videos.

Keywords: coupling of a monolithic floor with a column, static and dynamic load, punching pyramid, tangential stresses, concrete shear strength, punching strength

This article analyzes the main climatic indicators and considers domestic and foreign experience in the research and design of low-rise solar civil buildings in the conditions of the Republic of Tajikistan. Also, based on data from a number of scientists and preliminary studies, the basic principles of designing low-rise civil buildings, taking into account the location in the construction zone, were considered.

Keywords: climate, temperature, humidity, building, solar radiation, design, comfort, construction, insolation

During the reconstruction of historical buildings, it is necessary to carry out work on strengthening and strengthening structures. Reconstruction with preservation of the facade walls, which are an object of cultural heritage and form the street facade, deserves special attention. This type of reconstruction includes a complex of works to maintain the preserved structures. The work performed is temporary, but it significantly affects the duration and cost indicators of the entire reconstruction cycle. It is necessary to minimize this type of work in terms of economic and time costs. The purpose of this article is to analyze the existing systems of free-standing retaining walls used in the reconstruction of buildings, to determine the main technological parameters that affect the choice of the system as a whole.

Keywords: reconstruction, facade, facade retention, enclosing structure, construction, foundation, wall, assortment, expert assessment, installation, dismantling, fastening

This article investigates the moment redistribution behavior in corroded reinforced concrete (RC) beams. previous studies by different authors are reviewed, which shed light on the behavior of corroded statically indeterminate RC elements. The corrosion effects on the ultimate strength, deflection, and moment redistribution ratios are examined. The application of axial loads and location and severity of corrosion allowed for a comprehensive discussion of the moment redistribution behavior. The results showed that continuous RC beams with corroded reinforcement behave differently than simply supported RC beams. The corrosion process also affected the moment redistribution, providing additional safety to the RC structures. Existing research in this area is limited, and further investigations are required to address this knowledge gap and improve the understanding of the mechanism of moment redistribution in continuous corroded RC beams.

Keywords: corroded RC beams, statically indeterminate RC beams, moment redistribution, corrosion, accelerated corrosion method, ultimate strength, deflection, structures durability

The article presents an analysis of the phenomenon in which areas with elevated temperatures form in cities, and considers methods to combat this phenomenon. The article examines the causes of urban heat islands, including dense housing and the use of heat-trapping materials. Solutions are proposed such as increasing green spaces, using sustainable materials and proper urban planning. The article emphasizes the importance of creating comfortable areas for residents and sustainable development of the city in the face of climate change.

Keywords: heat island, surface temperature, hot areas, heat balance, city, suburb, planning

The article is devoted to the study of flange beam to column connections to analyze their nonlinear behavior. In the course of the study, a simplified analytical model was created using the method of variable elasticity parameters to determine the stress-strain state of these connections. The proposed mechanical model makes it possible to predict the strength, stiffness, ductility of joints, as well as possible types of fracture and deformation mechanisms of the bent elements of flange joints. This model can be useful for engineers and specialists in the field of design and analysis of civil structures. The proposed refined component model is an analogue of the Eurocode 3 model. The paper presents a numerical experiment on modeling the junction of a beam with a column by the finite element method. A comparative analysis of the results obtained with the results of tests of flange connections of steel building structures performed by the University of Sydney (USYD) is presented.

Keywords: flange connections, flange plate, stress-strain state, method of variable elasticity parameters, component method, refined component model, finite element method, elastic-plastic state, plastic hinge, modified stiffness, bending model of flange plate

Methods of calculation and design of building structures are considered that make it possible to provide trouble-free operation on time during the service life, and hence the level of reliability. According to the reliability indicator, the following scheme for standardizing the reliability of designed building structures is linked to the assessment of quality indicators of constructed structures. Indicators of design quality that are not related to strength, guaranteed with a given probability of failure-free operation, are introduced: geometric dimensions, modular deformation and elasticity, taking into account the properties of variability and technology. The appropriate safety factors are determined, ensuring mandatory protection of failure-free operation. A scheme for calculating design structures with the required level of reliability during the design, construction and operation of structures is being developed.

Keywords: method of calculation of structures, reliability, safety factor, strength class, reliability index, improvement of calculation of structures

The main designs of dust settling chambers of metallurgical enterprises are considered, an analysis is given from the point of view of the type of metallurgical furnaces, their power, and schemes for removing gases from them to gas cleaning equipment. The movement of gas flow in chambers of various designs was studied using the SolidWorks software product with the FlowSimulation application, which made it possible to establish the behavior of the gas-air flow depending on the design of the dust settling chamber.

Keywords: dust settling chambers, steel melting furnace, solid particles, modeling, gas-air flow, bag filter, gas exhaust path

At the present stage of increasing competition, the increased level of threats to the economic condition of business entities in any sector of the economy requires special attention. Enterprises of this industry annually emit aerosols of various composition and origin into the atmosphere: iron, vanadium, aluminum oxides, manganese oxides and other heavy metals. One of the components of safety is environmental safety and ensuring safe working conditions. The chemical composition of the dust-gas-air mixture of metallurgy enterprises is considered in the article, and the dispersed composition of aerosol emissions is determined. The data of the results of microscopic analysis of the fractional composition of dust based on the data of integral dependences of the density of distribution by equivalent sizes (diameters) D for the ingredients accepted for the study allowed us to determine the average median values of equivalent dust diameters.

Keywords: metallurgy, aerosol, electric steelmaking shop, dust-gas-air mixture, dispersion analysis, average median diameter, dh 50

The modeling and calculation of the proposed reinforced concrete slab using modern software systems are described. The description of the proposed reinforcement design is given. The results of the experiment on full-scale samples and the results of the calculation of the 3D model are shown. A comparative analysis of the data obtained during the experiment with the data obtained during modeling is performed.

Keywords: reinforcement of building constructions, hollow core slab, Experiment, modeling and calculation, comparative data analysis

The article shows the possibility of reducing the water demand of clinker binders based on gypsum-free cement with a multicomponent additive of technical lignosulfonate and an aqueous solution of sodium silicate. The possibility of obtaining composites based on modified gypsum-free cement with improved properties for building structures has been demonstrated.

Keywords: composite, gypsum-free cement, composition, technical lignosulfonate, concrete, Portland cement, sodium silicate, strength

The article considers the information modeling of the building frame of a complex shape in the plan. The Dynamo program for Autodesk Revit is used to build the geometry. The main goal was to achieve uniform color pressure maps when blowing a building using simulation modeling in an Autodesk CFD PC. The research method is numerical (finite element method). The LIRA-CAD software package was used. The finite element method was used to select the shape of the building and adjust its design scheme to achieve reliability and efficiency. The analysis of the structural elements of the object on the effect of wind loads, taking into account the pulsation component of the wind load, is carried out in order to improve the design decisions made.

Keywords: information modeling, finite element method, building frame, node system, modal analysis, waveforms

The article discusses the existing methods for calculating the strength of a normal section in multilayer bending structures. The experience of Russian and foreign researchers was analyzed, the approaches described in domestic and foreign regulatory documents were compared, and key differences were identified. At the same time, special attention is paid to the mathematical description of the work of concrete as a material. It was concluded that further research is expedient to find the most optimal method for calculating multilayer structures.

Keywords: concrete, reinforced concrete, multilayer structures, calculation method, bending element, normal section, stresses, high-strength concrete, stress diagram, description of concrete work, bending moment, neutral axis

The article is devoted to the development of a nodal joint for assessing the level of rigidity of a cylindrical mesh shell. Practical recommendations on the assembly of the tightening unit are proposed and the design of the screw coupling for the adjustable tension process is presented. The rational locations of the nodal joints on the lower belts of the support faces are determined. Numerical studies of possible schemes were carried out and the regularity of changes in the vertical movements of nodes from the end to the center was established. The positive contribution of reinforcing elements was revealed and the rigidity of the shell was determined. It is shown that the introduction of puffs with a developed node increases the level of resistance to operational loads and significantly reduces deformations in characteristic zones.

Keywords: nodal connection, cylindrical mesh shell, tightening, screw coupling, reinforcement, stiffness

The article discloses the content of geotechnical monitoring, which is an information base for the diagnosis of the condition of the object and the purpose, if necessary, methods for stabilizing the situation, as well as the need for its conduct at linear objects, That is, engineering defences. The analysis of data during the geodetic work on the object «Engineering anti-landslide protection of the northern slope of the Psehako ridge» with the description of the monitoring methodology, which consists of: reconnaissance of the area, development of a network of geodetic points, Taping of the tachemetric passages, taphemeter surveys and subsequent chamber data processing, which results in a report detailing all stages of work and directly concluding that there is or is not deformation. Based on the results of the field measurements, a list of tachemetric strokes, a list of coordinates of the zero cycle were compiled. The tachemetric moves are drawn in the *dwg format at a scale of 1:500.

Keywords: geodetic surveys, geodesy, geotechnical monitoring, desk work, field work, anti-landslide structures

This publication analyzes modern environmental technologies in the field of sustainable construction, discusses the features of the development of modern green construction, current Russian and international trends in the field of sustainable “green” construction, tools for stimulating and supporting projects recognized as meeting sustainability requirements. The importance of integrating environmental aspects into the process of building and managing campuses to create sustainable and healthy environments for the student community.

Keywords: construction, design, operation, ecology, ecological building, energy resource, energy efficiency, energy saving, building sustainability, building certification

A large number of pipelines are designed and constructed using steel pipes. The article analyzes statistical data on the corrosion damage of underground steel gas pipelines. The main failures occur in the areas where the insulation is damaged. During operation, the main focus is on controlling the condition of the pipelines' corrosion protection. In addition, it is important to inspect the pipeline route to analyze the condition of its surface. The analysis of underground gas pipeline damage revealed that the majority of corrosion malfunctions are found in pipelines that are 35–40 years old. Therefore, special attention should be paid to pipes that have been in operation for a long time when managing underground gas pipelines. Operational experience has shown that the majority of faults occur in gas networks with a pipe diameter of 100 mm. Moreover, the article presents an analysis of damage to underground gas pipelines, which found that the greatest amount of damage occurs on pipes laid at a depth of 1.5–1.8 meters. This is due to the increased soil moisture at the specified depth, which contributes to the occurrence of corrosion.

Keywords: operation of underground steel gas pipelines, corrosion damage, protection of underground gas pipelines from corrosion

As a result of artificial carbonization of slag, construction materials can be obtained. For this purpose, a technology has been developed for producing durable construction products as a result of accelerated carbonization of slag minerals with carbon dioxide (CO2) at elevated pressure (up to 2 MPa) and temperatures (20-60°C). The carbonates formed during the carbonization reaction act as a binder, sticking the slag particles together. Carbonized compacts after autoclave processing have technical properties equivalent to conventional concrete products made on the basis of Portland cement. The technology was developed in laboratory and production conditions by optimizing the parameters of the technological process (pressing force, temperature in the autoclave chamber, carbon dioxide pressure in the autoclave chamber and carbonization time) taking into account the increase in compressive strength and frost resistance of the samples.

Keywords: small-sized products, binder, preliminary preparation, steel slag, pressing, accelerated carbonization, minerals, carbon dioxide, strength, frost resistance

The article presents an analysis of modern environmental technologies used in the construction of student campuses. It explores innovative methods and approaches that enable higher education institutions to create sustainable and environmentally friendly campuses. The application of technologies such as energy-efficient buildings, the use of renewable energy sources, waste management systems, green spaces and much more are also considered. The article evaluates the benefits of these technologies, including reduced environmental impacts, economic benefits, and improved quality of life for students. Emphasizes the importance of integrating environmental considerations into campus construction and management to create sustainable and healthy environments for the student community.

Keywords: design, student campus, student dormitory, energy efficiency, landscaping, construction, self-sufficiency, materials, architectural solutions

This article discusses the comparative calculation of solid-stage and three-layer tubular structures with an assessment of the reliability of their application. To do this, their stress-strain state is investigated when exposed to a pulsed load on the wall. Pipeline structures currently occupy important positions in the infrastructures of many countries. Every year new safety requirements are added to the reliability indicators of these structures. Such important strategic facilities fulfill the task of providing people with energy, without which it is difficult to imagine modern life. For a solid-stage pipe, displacements in the nodes of the pipe wall, as well as longitudinal stresses (Nx) and annular stresses (Ny) in the elements of the pipe wall are determined. In a three-layer pipe, the displacements are determined at the nodes of the pipe wall.

Keywords: three-layer tubular structure, solid-walled pipe, load-bearing layer, pulse load, filler, displacement, voltage

Green roofs are of increasing interest as one of the solutions to counteract a number of environmental and socio-economic problems associated with the growth of urban areas. It is necessary to transform the built-up environment by including it in civil engineering, using the existing roof areas of buildings. Eexploitable green roofs need to be integrated into an urbanized urban landscape.

Keywords: sustainable urban development, transformation of urban spaces, green roofs, criteria for the intensity of use of green roofs