This article addresses the issue of structural analysis using the light steel thin-walled designs based on Eurocode. The main reason for the insufficient use of structures fromLSTC in Russia is described. Some flexibility, coefficients and their values ​​are given. Indicate the necessary types of checks for each design. The article contains information on the methods of joining elements from bent profiles of LSTC. It is also said about the types of design loads on the steel frame construction from profiles.

Keywords: light steel thin-walled designs , calculation, Eurocode, design, truss, arch, belt, section, characteristic, moment, coefficient

This article discusses the methodology for calculating buildings and structures for the maximum design earthquake using the Dynamics module + LIRA-SAPR 2019 software package, using accelerograms, collects and converts static loads into dynamic ones, and also calculates an industrial building for the situation of maximum design earthquake with subsequent analysis

Keywords: maximum calculated earthquake, calculation, seismic impact, loads, accelerogram

This article will analyze the technical and economic indicators and present the results of studies confirming the demand for this material in modern construction. Reinforced wooden structures are the most competitive due to their unique properties: environmental friendliness, economy, easy installation and transportation, reduced weight of structures and their volume. The facts presented in this article can and should be considered as design guidelines.

Keywords: reinforcement, structures, wood, construction, design, reinforcement, environmental friendliness, installation, testing, load, deformability

" During a long interruption of construction and installation works, as well as under the influence of the external environment on the unfinished construction of building structures, they are subject to a change in their properties and strength characteristics. To solve all problems, it is necessary to conduct a forensic examination in order to identify defects and assess the state of building structures and make decisions on the possibility and feasibility of completing construction work"

Keywords: construction in progress, expertise, defect, building construction, laboratory tests, design documentation, expert

Paper considers maximum annual values of mean wind velocity in all plain, piedmont and seaside regions of Krasnodar Krai for more than 60-year period of monitoring. Substantial areal differencies of trends of wind velocities change are revealed in north-east, seaside and central zones. Simultaneous analysis of time series of vane and anemometric measurements of mean wind velocities over 1965-2012 allowed to reveal a period of significant increase of wind velocities up to 1977 and detect a gradual decrease of velocities in 1979-2012. Significant areal differencies in wind velocity trends in north-east, seaside and central zones of region are shown. It is shown that time series of wind velocities used for SNKK 20-303-2002 allowed to develop a reliable base for wind loads which provides up to date an annual certainty level 0.98 adopted in the current version of building code SP 20.13330.2016 "Loads and actions".

Keywords: wind loads, actions, local building code, inversion criterion, trend significance, time series

In this article the comparative analysis of reinforcement of monolithic reinforced concrete plate under various conditions of calculation is made: without seismic actions, with design earthquake and with maximum design earthquake. It was found that taking into account the seismicity of 9 points without the use of methods of active seismic protection leads to an increase reinforcement to 28 % when taking into account the design earthquake and 81 % when calculating the maximum design earthquake. In addition, the analysis of the tool "Consumption of concrete and reinforcement" in the Lira-SAPR is made. The correction factor for the transition from theoretical to real reinforcement was obtained: it ranged from 2.4 to 3.0

Keywords: seismic impact, Lira-SAPR, maximum design earthquake calculation, frame calculation, slab, reinforced concrete, specific consumption of reinforcement

This article presents the results of monitoring the operational reliability of the on-farm network of rice irrigation systems. The issues of planning and prospects for its improvement on the basis of the introduction of modern laser scanning systems and digital a control systems are considered. In the Krasnodar Territory, the main consumer of water resources is agriculture, which absolutely prevails in terms of water withdrawal among other consumers. The most expensive water resource is the rice water industry. Its share is about 90% of the total water consumption in agriculture. To prevent degradation of the ecosystem of the river. Kuban and achieving the objectives of the Water Strategy by 2020, irrevocable water withdrawal must, at a minimum, be stopped at the achieved level. Satisfying growing water needs and introducing new water users should be implemented through water conservation in the systems of existing water users.

Keywords: monitoring, residual resource, rational water use, water resources, on-farm network facilities, rice irrigation systems, technical condition

The article discusses the features of the work of a monolithic flooring on a professional flooring, based on steel I-beams. An engineering method for determining the optimal cross-sections of I-beam steel beams is described, based on the compatibility of deformations of floor elements. Simple design formulas are proposed for preliminary determination of the optimal geometric dimensions, beams of their spans and loads. Strength calculations are performed, and the results of a numerical experiment are compared and analyzed. A table is presented in which the destructive linear load for some beams and spans is calculated, according to the results of the table, graphical dependences of the stresses in the beams are constructed as a function of the spans and relative deflections, as well as the stresses corresponding to the destruction of the beam. The optimal utilization rates of materials obtained in accordance with the requirements of strength and deformability of floors are established. The results can be used in the design of combined beams of various sections and spans.

Keywords: I-beam, combined beam, material utilization rate, standard deflection, profiled sheet, strength, profiled flooring, steel-reinforced concrete flooring

The modeling of a hollow core slab in the finite element complex Ansys is considered. The construction of a 3D model is considered. Numerical modeling was carried out under static loading of the floor slab. The influence of material properties on the parameters of the stress state and deflection of the structure is investigated. Based on a numerical experiment, an approach to assessing the characteristics of a structure is constructed.

Keywords: hollow core slab, static analysis, modeling, FEM, Ansys, stress state, deflection

The work is a continuation of the study of cable-stayed roofs of large-span sports buildings, it focuses on the technological aspect of the construction of stadiums and sports palaces. Due to the introduced criterion of the location of the assembly of structures, the systematization of technologies for the construction of facilities currently commissioned has been carried out. The result of the work is a comparative table that allows to rationalize the choice of methods of pre-assembly and installation.

Keywords: cable-stayed covering, large-span building, steel cable, cable, pylon, sports building, stadium, hanging roof, cable installation, pre-assembly, jack, disassembly of scaffolding

In this article the results of analysis of special simply-supported plate by theory of plates of moderate thickness are presented. The special feature of this plate consists in specification of special boundary conditions on its edges which are different from usually specified boundary conditions. The uniformly distributed load is acting upon the plate. In this article the results of analysis by the finite element method are presented

Keywords: simply-supported plate, theory of thick plates, theory of plates of moderate thickness, Mindlin plate theory, Kirchhoff plate theory, bending moment, twisting moment, shear force, finite element method

In this paper, the previously obtained equation of motion in displacements is used to determine the frequencies and forms of free oscillations of the underground gas pipeline. The problem of solving this equation is reduced to finding the eigenvalues of the determinant, which are the squares of the natural frequencies of the cylindrical shell. Neglecting the secondary coefficients of the determinant and equating them to zero, the formula for the square of natural frequencies of an underground rectilinear thin-walled gas pipeline exposed to the action of internal working pressure and longitudinal force is obtained, taking into account the reaction of elastic resistance of the soil. Substituting the values for the wave numbers in the longitudinal and circumferential directions into the obtained formula, expressions for determining the frequencies according to the rod and shell theory are derived.Using these expressions, the dependence of the frequencies of free oscillations of the depth of the pipeline at fixed values of the pipe wall thickness, the coefficient of elastic resistance of the soil and the length parameter of the plot, for different values of internal pressure, the ratio of longitudinal compressive forces. When analyzing the results, it was found that with increasing depth of the pipeline, the frequency of free oscillations decreases, and at a certain depth, the frequency of free oscillations becomes equal to zero, this indicates a flattening of the cross section of the pipeline. Using the dynamic stability criterion, for which the frequency of free oscillations turns to zero, an expression is obtained that allows to determine the depth of the pipeline at which the stability loss of the second kind occurs.

Keywords: pipeline, frequency of free oscillations, depth of laying, coefficient of elastic resistance of soil, loss of stability

The article deals with the survey of transport and operational condition of the highway R224 " Samara-Orenburg in which it was found that the roadway surface is in poor condition due to the presence of transverse cracks, ruts and pits. In a survey of 5 existing culvert structures were identified unacceptable defects in the structure. Based on the foregoing, the specified section of road be repaired in accordance with GOST R 50597-2017 “roads and streets” . Currently, economical and mobile methods of inspection of road structures are of particular relevance. Conducting engineering surveys of the GPR system MIRA was determined the constructive layers of road clothes light. The decision on milling to a partial thickness of the pavement that runs recyclers WR 4200, with the subsequent device of asphaltgranulate type To

Keywords: pavement engineering, GPR applications, roads, surveys, MIRA GPR systempurposes of ensuring flexibility of production

The influence of changes in the geometry of a metallic cylindrical mesh shell without reinforcements, with puffs and with horizontal trusses on the specific weight index is investigated. The span and the angle of the circumscribed circle of the shell are taken as the given parameters. They determined changes in the radius of curvature, height, cell size, shell length and stiffness characteristics of the rods. To determine the required specific gravity parameter, the number of elements was distributed by standard sizes. The calculations were performed using the application software PC LIRA. The obtained data were analyzed, as a result of which the optimal distance between the supports was determined, which made it possible to find the minimum mass and establish acceptable geometric parameters of the structure. In addition, extreme values were determined, beyond which the study of the influence of changes in geometric parameters on the specific weight index becomes impractical.

Keywords: cylindrical mesh shell, element of reinforcement, geometrical parameter, specific weight index, element of tension, horizontal trusse

The article examines the influence of observance of the frame dome-shaped roofs assembly technology on the quality of the completed object. This theme is relevant enough, as the building roofs, constructed in accordance with the aforementioned technology, are often found in modern business clusters. It`s natural that prospective investors are interested in perfect quality and seamless service properties of similar construction object designs. The authors considered features of the frame dome-shaped designs construction and assigned its pros and cons; the review of the technical investigation of one of the shopping centers was conducted with purpose of showing the consequences of inaccurate observance of the specified designs installation technology. Subject to facility technical investigation results, recommendations for the safety operation of dome support structures were given.

Keywords: steel designs, frame dome-shaped objects, frame dome-shaped roofs installation, technical investigation of frame dome-shaped roofs, spherical sheath imperfections

This article discusses the calculations of the feasibility study for the expansion of housing construction in Rostov-on-don. The main part of Rostov-on - don, where the vast majority of buildings are concentrated - the city center, residential areas, main production areas, special purpose facilities-are located on the high right Bank of the don. Active formation of new multifunctional planning areas of the city: North, West, North-East. Leventsovsky and Suvorovsky districts are under construction. For implementation of design decisions on development of housing construction in Rostov-on-don there is a need of an economic assessment of possible options that it is necessary to study in pre-project documents, such as the feasibility study of construction of objects.

Keywords: "feasibility study, Economics of urban planning, pre-project preparation, investment efficiency, urban planning, construction Economics, effective design solutions, design, housing construction, housing stock. environmental requirements, construction indu

In article the algorithm of calculation of systems with unilateral constraints with the replacement reactions of the supports on the force variables. The calculation algorithm is based on the finite element method in the form of the classical mixed method. The algorithm of search of version of the working constructive scheme is based on the modified "physically obvious" algorithm of design constructively nonlinear systems. The paper describes the features of the resolution system of the algorithm proposed by the authors and provides a flowchart. A comparative analysis with the algorithm of calculation of systems with unilateral constraints, proposed by the authors earlier, as well as some others. The efficiency of the algorithm is tested on numerical examples.The advantages of the proposed algorithm are: The vector of results includes the reaction of the support, which allows you to make a decision to change the design scheme; the calculation takes into account, as an additional loading factor, the size of the displasement in the realized one-way support, which increases the accuracy of the calculation.

Keywords: structural mechanics, single-sided supports, structural nonlinearity, the mixed form of the finite element method

The paper focuses on energy efficient reconstruction of construction systems by means of their upward extension using modular spatial structures. It is further noted that the existing contradictory definition of the term “modular structures” necessitates classifying modular structural elements by spatial dimension, type and size, weight, degree of prefabrication, constructability and environmental safety. A list of the world’s leading manufacturers is provided featuring modular spatial structures to be used in the construction of new buildings and reconstruction of existing buildings. Also, the paper underlines the importance of using added stories in making modular roof structures of lightweight metallic structures (LMS) and lightweight thin-wall steel structures (LTSS) and provides an overview of the main types of modules, pointing out the key benefits of modular structures.

Keywords: modular building structures, energy efficient reconstruction, upward construction, structural and non-structural modules, constructability

The algorithm of calculation of the main geometrical characteristics of the section consisting of pair angles at a bend of both angles is made. The received results are applied to definition of a carrying capacity of an element of a farm.

Keywords: a rafter farm, bend, a barycentre, a moment of inertia, a radius of inertia

The article presents the results of the development of wooden building blocks that allow to saturate the room air with phytoncides of Siberian and other species of wood and plants. Shows the fundamental design of the blocks, the features of its production and processing. An example of the positive effect of essential oils on the reduction of bacterial air pollution is given. Buildings and structures of the proposed unit are quickly built without the use of specialized equipment. The construction and reconstruction of such a structure can be more effective in terms of both labor costs and terms of work, in comparison with traditional construction practices. Production of buildings from the offered blocks opens prospects of low-cost construction of low-rise constructions, both residential, and industrial use.

Keywords: wood building material, environmental friendly, wood processing, resin, essential oil, extract

The paper presents an analysis of stadiums with cable-stayed roof, in the context of progressive solutions used in various construction cycles. On the basis of the systematization carried out, the directions of the rational use of the identified methods of reducing material consumption and deformability, increasing the rigidity, stability of structures, improving the efficiency of installation work have been highlighted.

Keywords: cable-stayed roof, long-span building, steel cable, aerodynamics, cable-stray, pylon, sports object, stadium, hanging roof, translucent roofing, light opening roof, monitoring system of the technical condition of the object, cable roof mounting

The article provides a technical solution to increase the bearing capacity and reduce the deformability of the subsiding base of a house. The design features of the fixed base and enclosing rows of bored piles are described. The article was published in the framework of the program of the International Forum "Victorious may 1945".

Keywords: row, anchoring grounds, reinforcement, soil, cement, cementation, directional hydraulic fracturing

Restoration and strengthening of building structures damaged during operation in conditions of constant soaking and aggressive influence of liquids. On the example of the overhaul of the floor structures of the premises and tunnels of the champagne factory "Abrau-Durso" were shown the most effective and technological ways to strengthen the load-bearing structures.

Keywords: shotcrete, concrete, reinforcement, bearing structures, reinforcement, bearing capacity, shotcrete, reinforcement, corrosion, repair, finishing

Paper considers maximum annual values of mean wind velocity in all plain and piedmont regions of Krasnodar Krai, which served as the basis for design values of wind loads on buildings in local code SNKK “Loads and Actions. Snow Loads and Wind Actions”. Time series of anemometric measurements of wind velocities are analyzed from the beginning of 1970s to 2012 extended by 13 years as compared to the time series used for developing this code. For detecting the significance of the linear trend of wind velocity maximums inversion criterion was employed. Calculations were performed for the data of anemometric wind velocity measurements on 29 meteorological stations uniformly distributed over a territory of the region. They showed that significant trend of increase of wind velocity with the high level of statistical certainty 0,95 is present only in two cases. In half of the rest cases trend is descending, in another half trend is statistically insignificant as well as mostly descending. Average decrease of wind velocity is 30%.

Keywords: wind loads, actions, local building code, inversion criterion, trend significance, time series

During designing unique buildings, great attention is paid to the correct setting of operational loads. When determining the wind load for particularly difficult cases, it is proposed to blow models of objects in a wind tunnel. In the case of using virtual models, the main tool is the ANSYS complex. This complex belongs to the "heavy" scientific programs, therefore, for building structures, the SolidWorks software package can be convenient. The article describes the simulation of variable height wind impact on a unique building in this program. The loading of a three-dimensional model of a high-rise building with cantilevered floors was carried out and the law of distribution of static pressure on a complex object was established by blowing the model in a virtual wind tunnel. In this case, the modeling process itself is simpler and more convenient than in ANSYS.

Keywords: Unique building, wind load, wind tunnel, building frame, finite element method. pressure console floor