bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Ultimate Strength and Buckling Modes of Cold Formed Steel Structures
Authors: Manimaran A , Sathish L , Ravichandran P T
Published: September 2020

Stronger construction material is category from one of the steel structure are attain higher strength with stand the resistance of steel by natural as well as it could made in different shapes. The exact shape of steel structure and its profile are precisely designed from cross section to ensure Indian Standard along with mechanical and chemical characteristics. All over the country’s most of the industrialization is precise on sizes, shapes; strengths, storage practices and its composition of steel structure are used as per standards. cold-formed steel is effect with rolling of thin gauge steel sheet increasing the yield strength whose products are widely used in construction industries, as well as structure like columns, beams, joists, studs, floor decking, built-up section, telecommunication towers, electricity transmission steel tower, multi-storied steel structures, etc., due to its stronger and reduction in dead weight cold-formed steel is used. The dies are series of making various section of cold-formed steel structural member with different section and shapes by cold roll forming the steel to attain the preferred shape. As per the standard, nominal minimum yield strength of sheet steel rolled in cold-formed section is 250 N/mm2. However, user trend use of greater strength, but it could be lesser as 230 N/mm2.
Investigation on Industrial Waste Material for Stabilizing the Expansive Soil
Authors: Divya Krishnan K , Ravichandran P.T.
Published: September 2020

The increasing demand of fertilizer for agricultural field to make the farmable land results in the more generation of byproducts during the manufacturing stages. These byproducts can be utilized by various treatment techniques for the reduction of its contaminants due to its disposal for long time. In this study, the strength characteristics of two expansive clayey soils were studied and it was observed an enhancement in strength by the addition of an industrial waste product, Phosphogypsum as a stabilizing agent at various percentages of 2, 4, 6 and 8 by weight of soil. The attainment in strength characteristics of soil due to the mixing of additive has studied by conducting Unconfined Compressive strength tests at the various time periods of 14, 28 and 60 days. UCS results showed that soil solidification process by the additive exhibited the maximum compressive strength of 50% when the addition of Phosphogypsum reached by 6% at the curing period of 28 days. The improvement in soil characteristics were analysed chemically and it was also studied under microstructural analysis, X- Ray Diffraction methods. Microstuctural studies reported a remarkable change in the mineralogy of the treated soil, with the fine phases formed due to the pozzalonic reactions which are responsible for the strength development. Thus the Phosphogypsum waste in the clay as a soil stabilizer suggests a most economical material for the remarkable improvement in the properties of soil and it will be the best options to manage this waste as sustainable material towards the green environment.
Effect of pyrophyllite on behavioural strength of clayey soil
Authors: Arun B , Ravichandran P T , Divya Krishnan K
Published: September 2020

The clay soil consists of minerals like montmorillonite which shrink and swell when the moisture content is altered because of which the bearing capacity of soil get decreased, which causes differential shrinkage of soil can leads to failure of super-structure. These weak soils can be stabilized by adding chemical minerals to improve its properties. The probability of stabilizing the clay soil using pyrophyllite in different proportions like 5%, 10%, 15% and 20%. Initially the compaction characteristic on adding pyrophyllite was done by standard proctor compaction test and the strength character were done based on unconfined compression test at various curing periods such as 0, 3, 7, 14 and 28th days and California bearing ratio test done on 4 and 7thdays. Compaction character test shows that on addition of pyrophyllite content, OMC increase whereas MDD decreased. UCC strength was noted after a curing period of 28 days the strength gain was maximum, the rate of development in the strength however decreased in 20% of pyrophyllite content with the soil showed the maximum strength when compared to the other percentages. Also, on adding admixture the CBR value increases, but not beyond 15% for soil sample 1 whereas CBR value increased till 20% for soil sample 2. From the results, the admixture of 15% can be selected as a nominal percentage which can be used in soil to enhance the soil character. In addition to strength parameter, these admixtures are also an eco-friendly and economical additive in soil stabilization process.
Different Type of Nasties Using in Linear Programming Problem
Authors: Sumathi P , Indhumathi N
Published: September 2020

An innovative procedure for identifying a nasty numbers with the help of twin nasties using Big-M method in linear programing problem is existing in this paper. Linear programming is a way for defining an optimum schedule of interdependent events in observation of the existing resource. A definition of twin nasties and the interesting properties of nasty number is summarized. A new method of relating Big-M method with twin nasties using maximization procedure to get optimal solution which is a nasty number is shown in a clear way.
Assessing the spatial impact of urbanization on surface water bodies using remote sensing and GIS
Authors: Sridhar M B , Sathyanathan R
Published: September 2020

Indian cities are expanding exponentially due to rapid and unplanned urbanization. The unprecedented pace of expansion is a major challenge for surface water management. The shrinkage of surface water bodies is considered as an important criterion by urban planners and policymakers. This research utilizes remote sensing data to address this problem for the suburbs of Chennai. The extent of urbanization is studied through remote sensing data obtained from satellite imagery at 30 m resolution for the year 2019 and land use land cover classification is also carried out to determine the urban built up. The initial surface area of the water bodies were determined using the topographical maps and was then compared with the present areal extent. The result reveals that the urbanization had a significant impact on the spatial extent of surface water bodies. The water bodies have significantly undergone reduction and disappearance due to urban expansion. Proactive land use planning and monitoring are essential to safeguard the ecological value of water bodies.
Spatial and temporal structure of urban heat island in Ludhiana city
Authors: Sridhar M B , Sathyanathan R , Sree Shivani N
Published: September 2020

Since the late 19th century, global warming as obtained more attention as the global mean surface temperature has increased and urbanization is one of the major causes of global warming. Given the fact of the heavy migration of people from rural to urban, uncontrollable growth takes place to accommodate this population. This is considered to be a major problem in developing countries. Ludhiana a city in the state of Punjab, India is considered for the study. In this study, LANDSAT 8 (2019) and LANDSAT 5 (2000 and 2009) were taken from USGS to retrieve Land Surface Temperature (LST) and Land Use Land Cover (LULC). Rapid urbanization resulted in the formation of Urban Heat Island (UHI). The UHI had a mixed pattern of temperature variation for barren, urban, water and vegetation lands. The results of the land covers were computed as normalized indices as Normalized Difference Vegetation Index (NDVI), Normalized Difference Water Index (NDWI), Normalized Difference Built-up Index (NDBI) and Normalized Difference Barren Index (NDBaI). The relationship between temperature and indices were determined, the NDBI and Normalized NDBaI produced an increase in LST as the range of NDBI and NDBaI increased.
Experimental Investigation on Partially Additional of Coarse Aggregate with Ceramic in Concrete
Authors: Rajprasad J , Sarath B.K. , Pannirselvam N
Published: September 2020

Ceramic Waste partially replaced as a substitute for coarse aggregates in concrete has been investigated. Two types of ceramic waste, namely tiles and flowerpot were used. Concrete mixtures with characteristic strength of 28 days 30 N/mm2have been prepared using a water/cement ratio of 0.5. The strength of the concrete mixes containing recycled ceramic waste aggregates was compared to conventional concrete. Compressive strength of concrete made from ceramic waste aggregate is studied with 0, 10, 20, 30 and 40% replacement of natural coarse aggregate by ceramic waste aggregate.
Comparison of calculation results of flexible plates on the basis of difference equations of successive approximation method and generalized equations of finite difference method
Authors: Dao Ngoc Khoa , Gabbasov Radek , Quyen Hoang Thi Linh , Thuy Nguyen Le
Published: September 2020

In structural engineering, the analysis of plate elements is one of the important problems that based on theory of plates. The analytical solutions using traditional methods and manual calculations are determined in the cases with simple calculation schemes. It will be difficult to solve problems with the complicatedness in loading and boundary conditions. Thereof, the application of numerical methods is necessary to deal with that. The finite difference method and successive approximation method are popular numerical methods to solve relatively thoroughly the plate problems. In addition, with the development of construction technology, the dimensions of the current building projects become greater and lead to increase of building displacements that is required to take into account in analysis. The analysis of plates with non-linear geometrical is relatively complicated and iterative algorithms can help to solve this problem. In this paper, the authors used the difference equations of successive approximation method (MSA) and generalized equations of finite difference method (MFD) to solve the problems of non-linear plates with different boundary conditions and loading. From the comparison of obtained results with Volmir’s analytical results the conclusions and recommendations are proposed.
Reinforced concrete beams with console ribs along their side surfaces
Authors: Likhov Z R , Dzhankulaev A J , Tokhaev G Kh , Khussein A Sh
Published: September 2020

The formulas for determining losses in pre-compressed high-strength reinforcement are given, as well as the condition for closing the initial technological cracks in bent elements with pre-compressed reinforcement necessary for calculating reinforced concrete beams with pre-compressed and stretched high-strength reinforcement
Measures to Increase the Building Steel Structures’ Bearing Capacity
Authors: Pirumyan N V , Stakyan M G
Published: September 2020

The issue of increasing the building structures steel elements’ bearing capacity using the surface plastic deformation (SPD) method, is considered, applying the complex assessment method of the factors’ parameters acting on the structure and fatigue resistance, which, in contrast to the current principle of differential evaluation, more accurately takes into account the structure’s state in the operating conditions. Interrelated functional dependencies between these indicators are identified and the parametric explanations’ systems taking into account the dominance of a certain factor in the design work, are made. These systems of equations make it possible to calculate the interrelated indicators and assess the impact of each of them on the structure’s bearing capacity.
The stress distribution heterogeneity influence on the limiting state of a bent curvelinear beam
Authors: Kalashnikov S Yu , Gurova E V , Kalinovsky S A , Kuramshin R Kh
Published: September 2020

The limiting elastic state of a beam with large curvature under pure and transverse bending is considered. The gradient plasticity condition which determines the yield onset in an inhomogeneous stress state is applied as a criterion of the ultimate state. The analytical expressions for calculating the corresponding stresses and loads are obtained.
Reliability assessment of reinforced concrete structures during commissioning
Authors: Pshenichkina V A , Babalich V S , Sukhina K N , Dubovsky M E
Published: September 2020

The article presents the studies’ results on the safety characteristics of the most damaged load-bearing structures in a monolithic reinforced concrete building. Reliability assessment was carried out at the stage of putting the building into operation. The analysis of the numerical reliability characteristics is carried out taking into account design and actually implemented strength parameters of the considered structures.
Survey of the damaged closely located buildings in the historical part of the Sanaa city (Yemen)
Authors: Yahya Nasser AL-Bukhaiti Ali , Ledenyov V V , Savinov Ya V , Umnova O V , Mohammed hamash Jawad ahmed
Published: September 2020

The results of a technical survey of buildings with damage caused by the mutual influence of nearby buildings in the city of Sanaa (Yemen) are presented. The stress-strain state of the foundation is calculated by the finite element method (FEM) using software «Plaxis 3D».
Analysis of bending plates with mixed boundary conditions using generalized equations of finite difference method
Authors: Gabbasov Radek , Filatov Vladimir , Dao Ngoc Khoa , Quyen Hoang Thi Linh
Published: September 2020

Currently, plates with characteristics of high thermal insulation, sound insulation and strength are sufficiently and widely used in structural engineering. To describing the connect of the plates with other elements, it is possible to give many calculation schemes on the different views. In this paper, it is considered the problem of rectangular plates, each side of which are fixed with hinged support or fixed support. This paper deals with the discontinuous points of boundary conditions with the use generalized equations of finite difference method. The obtained results of the analysis of stress state in discontinuous area of boundary conditions are compared with the results of work of Smirnov V.A.
Flexural buckling of a revolving bar in a rigid pipe with a gap exposed to axial force and dead weight
Authors: Yazyev S B , Ivanova P V , Konoplev Yu G , Yazyev B M
Published: September 2020

The article proposes a solution to the stability problem of a revolving bar loaded with axial force and inserted into a rigid pipe with a gap by the Bubnov-Galerkin method. Two options as the deflection coordinate functions are considered. When calculating, the dead weight of the bar is taken into account. With a total load greater than the Euler load, lateral forces (reactions), touching the pipe wall, appear in the bar. At the end of the article, the formulas for determining the voltage after buckling are presented. The obtained formulas make it possible to determine the critical load of the system for each individual case, taking into account its dead weight and centrifugal forces from the revolving bar. The above-mentioned relations also give an opportunity to determine the reactive moment magnitude from the contact of the revolving bar and the pipe wall.
Approximation method for the characteristics class related to magnetic cleaning quality of reverse waters from ferrous admixtures
Authors: Bulyzhev E M , Menshov E N
Published: September 2020

A method for approximating the aperiodic characteristics class in the category of exponential polynomials has been developed. The advantage of this technique is that even though there is no strict regulation on these polynomials’ structure, it is possible to achieve adequacy with a smaller number of approximating summands and to include the additional systemic information on the technical object (technological process) to the model.
The interaction of high intensity seismic rayleigh and rayleigh – lamb waves with structures
Authors: Ilyashenko A V , Morozov N F , Rashidov T R , Bratov V A , Mardonov B M
Published: September 2020

The arrivals of high intensity seismic Rayleigh and Rayleigh – Lamb waves to the buildings and structures with a relatively large footprint are analysed. The most frequent cases of the foundation structures’ fracture and damage are discussed. The methods for seismic protection from the main types of surface seismic waves, Rayleigh, Rayleigh – Lamb, Love and some more peculiar evanescent (head) waves are considered. The analytical and numerical methods for modelling interaction of building structures with these types of surface seismic waves are analysed. The comparative analysis of the wave dynamic method and the methods based on the spectral decomposition is given.
The study on the magnetic separation efficiency of the reverse water technological liquids from scales in industrial production. Part 1. The problems’ analysis and solutions
Authors: Bulyzhev E M , Menshov E N
Published: September 2020

The causes leading to the technological equipment contamination of for rolling mills and consequently the environment are analyzed. The prospects of using the magnetic separators are substantiated. In order to reduce water consumption to a minimum by rolling production and to reduce the emissions of scale with oil products on its surface into a water body by ten times, high-quality treatment of reversed waterby permanent magnet separators with a fineness of 1–2 mkm is required. The mathematical modeling methods of the quality characteristics separation for monodisperse and polydisperse aqueous ferromagnetic suspensions are considered. It is shown that the required refinement can be achieved in multi-row magnetic separators.
The study on the magnetic separation efficiency of the reverse water technological liquids from scales in industrial production. Part 3. improving the magnetic separation technology
Authors: Menshov E N
Published: September 2020

The magnetic coagulation process mechanism features occurring in magnetic separators are disclosed. Magnetic coagulation occurs only at the threshold concentrations of ferro-particles in aqueous ferromagnetic suspensions. The basis of convergence (aggregation) mechanism of ferro-particles in a gradient external field is the difference in the ferro-particles’ speed with different masses. Based on mathematical modeling, it was found that during coagulation, the residual concentrations of ferro-impurities cannot exceed certain limit values, and mathematical expressions are obtained for calculating the distributions of the dispersed composition of aggregated particles. The combination of optimization procedures for the magnetic separators’ geometric parameters and the cleaning characteristics taking into account magnetic coagulation makes it possible to ensure the high levels of cleaning efficiency of finely dispersed ferromagnetic suspensions while reducing the cost of magnetic separators up to two times at the design stage.
Numerical methods for determining the stressed-deformed state of the electric transmission lines supports
Authors: Sabitov L S , Maylyan L R , Ziganshin A D , Gatiyatov I Z
Published: September 2020

The study examines the influence of the docking nodes reinforcement geometric, mechanical and structural parameters on the stress-strain state of the overhead power lines supports structure taking into account the supports concreted base interaction with the surrounding soil. The steel supports of the overhead power lines, which are thin-walled shell-rods of a closed profile, are modeled by the finite elements of the Tymoshenko-type shell. The concrete base of the support and the surrounding soil are sampled by three-dimensional finite elements of a continuous medium with the corresponding physical and mechanical properties. The influence of the kinematic conditions options for securing the support and taking into account the contact interaction of the concrete support and soil on the VAT design calculation is studied. A methodology for calculating the structures of steel supports and their docking catches was implemented as a part of the ANSYS 14.5 numerical simulation software package. Based on the proposed methodology, a computational experiment was conducted, during which the analysis of the stress-strain state of the overhead power transmission towers fixed in the ground for various types of the docking nodes reinforcement.
The generalized load statistical parameters’ assessment on the building structures
Authors: Pshenichkina V A , Glukhov A V , Gritsenko B S , Sidorova N Yu
Published: September 2020

The distribution laws’ composition of the permanent, long-term temporary, snow and wind loads acting on the structure of buildings and structures is estimated. The following load distribution laws are respectively adopted: normal, logarithmically normal, Gumbel and Weibull. The calculation of the four main central statistical moments was carried out, the approximate distribution law for the generalized load was established by the expansion method in a Gram-Charlier series, as well as the magnitude of its statistical variability. The characteristics of the load variability are compared with the approximate solution of A.N. Dobromyslov. The results obtained are intended for the practical solution of the problems of assessing the safety and residual life of buildings and structures using the reliability theory methods.
On the heterogeneous rock mass stress condition at the unsteady temperature condition
Authors: Frolova I I
Published: September 2020

The unsteady thermoelastic problem of the rock mass stress state in the vicinity of a spherical cavity in the temperature field presence is considered. The temperature field around the cavity, partially filled with coolant, is calculated by the explicit difference scheme. Such tasks arise during the creation and operation of the underground cavities for the various products’ long-term storage. Moreover, the tendency to self-heating of the stored substances leads to the appearance of high-temperature fields, which in turn can cause the significant temperature stresses’ occurrence. A feature of the work is to take into account the two-dimensional heterogeneity of the massif material, which is due to both the fracture of the rock and the dependence of the deformation characteristics on temperature. In the article, the problem of thermo-elasticity is solved as quasi-stationary. Obtaining analytical solutions in the problems of thermo-elasticity of inhomogeneous bodies is associated with great difficulties. Such solutions are obtained, as a rule, for the case of one-dimensional heterogeneity of an object’s material. The obtained temperature field was used to solve the problem of determining the stress state of the array, and the finite element method was used. The results obtained indicate the need for calculations and design of underground cavities to take into account the real properties of the rock mass materials, as well as their change under the influence of various physical processes.
Optimization of steel frames with the choice of materials’ grades with restrictions on general and local stability, strength and stiffness
Authors: Serpik I N , Averin A S
Published: September 2020

A computational scheme for the optimal design of steel flat frames made of thin-walled rods with closed cross sections has been developed. The structural elements’ total cost is minimized by searching for the materials’ grades and the rods’ cross sections sizes on the variable parameters’ discrete sets. The rods are separately grouped according to the condition of using one steel grade and the criterion for the cross sections’ identity. Active restrictions on the overall structural system’s stability, local stability of the rods’ walls, strength and stiffness are taken into account. The optimization process using a genetic algorithm using a mixed approach to the mutation procedure, a selection option that provides the inoperative design options, and a single-point crossing-over procedure for the simple exclusions from consideration is implemented. The deformable object stress-strain state analysis is carried out on the rod finite element model’s basis. The assessment of ensuring overall stability is carried out by checking the positive definiteness of the tangent stiffness matrix of a finite element system. Local stability using an analytical relationship for rectangular plates, generally subjected to compression-tension and bending in their plane is confirmed. The results of optimization of a three-span frame made of square pipes are presented. Steel grades and profiles were selected for the groups of the structural system’s rods.
The shear span influence on the crack formation and fracture features in the experimental samples in the external conditions of composite reinforcement presence or absence
Authors: Shilov A A , Shilov P A , Shilov A V
Published: September 2020

The results of the cracking and fracture process investigations in the inclined sections of the reinforced concrete beams, in the conditions of reinforcement presence or absence in the supporting areas with the triangular U-shaped carbon fiber clamps, are presented. The impact of a slice span of 1.5h0, 2.0h0 and 2.5h0 is estimated, as well as the presence of composite reinforcement, on the inclined cracks’ formation and development features.
Determination of the snow cover weight and altitude coefficient values in mountainous and poorly studied areas for assessing loads on buildings and structures
Authors: Adzhiev A Kh , Bekkiev M Yu , Kondratyeva N V , Yurchenko N V
Published: September 2020

The materials use in structures and calculations for buildings and structures in Russia is determined, inter alia, by the normative loads of snow cover on the construction site. An urgent task is to determine its significance for the unexplored areas. The results of determining the normative value of the snow cover weight and changes with the height of the snow weight terrain for the designed objects of the “Udokan” Mining and Metallurgical Combine at the altitudes from 600 to 2000 m are presented. To determine the estimated snow load on buildings and structures in the territory of the facility creation, we used the series of the water supply annual maximums in the snow cover obtained as a result of the snow-measuring route observations at high-altitude weather stations located close to the designed objects. Based on the data of weather stations, a regression linear model of the water supply dependence in the snow cover on the height above the sea level was built. The main calculation method for finding the coefficients of a linear equation is the least squares method. It was revealed that with an increase in the height above the sea level by 1 m, the water supply in the snow cover increases by about 0.1 mm.
Energy-efficient double-row masonry of the exterior walls in the buildings made of cellular concrete blocks
Authors: Suleymanova L A , Pogorelova I A , Marushko M V , Ryabchevsky I S
Published: September 2020

Ensuring the increased requirements for heat saving, environmental safety and comfort of residential and public buildings is one of the main directions of scientific and technological progress in construction. In particular, the cellular concrete products’ use in building envelopes is aimed at solving these problems. Cellular concrete blocks perform the wall-forming material functions and insulation simultaneously due to their thermophysical and strength characteristics. However, the factor reducing the energy efficiency of aerated concrete masonry is the filling of masonry joints with adhesive or cement-sand mortar, which are the thermometer bridges, and the use of polyurethane adhesive, which has lower thermal conductivity compared to adhesive mixtures, as an aggregate of vertical and horizontal joints is unacceptable due to its high deformability and low shear stiffness. The authors examined the systems of building envelopes made of cellular concrete blocks used in civil engineering, and identified their shortcomings that affect the energy efficiency of the entire building. The authors have developed an energy-efficient two-row masonry of cellular concrete blocks, the device of which allows to reduce the masonry thickness and facilitate the installation of the enclosing structure with equal masonry thermal conductivity.
The effect of a polymer material coating on the stress state of plate building structures with holes
Authors: Koryagin S I , Velikanov N L , Sharkov O V
Published: September 2020

Polymeric materials, in particular reinforced coatings, are widely used for the repair of worn and damaged plate building components of various types. Coatings made of polymeric materials not only increase the plate components’ thickness and smooth out the surface roughness, but also provide a reduction in stresses in the region of existing holes or perforations. The article presents a calculation technique that allows to increase the accuracy and reliability of determining the ability of coatings made of polymer materials to reduce stress concentration. Mathematical models for determining the stress state parameters of a plate building component with holes covered with a polymer material are obtained. The calculations confirmed that the use of polymeric materials as a coating reduces the normal and tangential stresses arising at the edge of the hole.
Strength of the monolithic coverings with non-fixable formwork of steel fibro-tuffcrete elements
Authors: Khasauov Yu M , Atabieva M M , Chochuev A A
Published: September 2020

The article presents the strength study results of the tuffcrete flexible monolithic structures with fixed formwork, combined reinforced rods and fibers. The nature and degree of the fibers percentage influence in the tuffcrete element of the fixed formwork, the dimensions of the fixed formwork elements’ fiber-reinforced section and the strength of monolithic tuffcrete on the normal strength to the longitudinal axis of the monolithic combined-reinforced bending floor structures, as well as on the adhesion strength of the fixed form contact line with concrete monolithic, are analyzed. The experimental dependences that make it possible to more economically design the structures under consideration, taking into account the strength and quantity parameters, as well as the geometric dimensions of their individual components, are proposed.
The antenna mast reconstruction structure’s technical support
Authors: Fil O A
Published: September 2020

The article is devoted to technical support of engineering surveys and design during the structures’ construction. Technical support aims to develop and implement the new research methods to obtain the most accurate and reliable data. The author considers the tower of NSC JSC as an example for the possibility of installing the additional equipment for the BS 66487 “New Dzheguta” base station. The design indicators’ determination was carried out using the Selena computer program, which made it possible to get the structure’s actual performance in a short time, excluding the fairly old methods of examining the construction sites, to facilitate the work and reduce the time spent on diagnosis at the same time.
The influence analysis of the structures and applied software systems’ soil foundations design models
Authors: Khashirova T Yu , Olgarenko I V , Kozhenko N V
Published: September 2020

In difficult engineering and geological conditions, the water-supporting elevated structure’s design is carried out taking into account the base soil model, as well as the correctly selected software package, which allows to determine the stress-strain state (SSS) of the structure and as a result, all structural and technological parameters qualitatively.
The results of determining the structural elements’ displacements when using various soil models and software systems
Authors: Degtyareva O G , Vasiliev S M
Published: September 2020

Taking into account the nonlinearity of the structures base soil work of the of the of during geotechnical calculation makes it possible to adequately determine the stress-strain state (SSS) of structural elements and, in general, the base - foundation - structure system.
Assessment of the damage impact to particular water structures on their performance
Authors: Olgarenko V I , Khashirova T Yu , Kozhenko N V
Published: September 2020

Identifying the type of damage in which the structure’s performance is not ensured is one of the most critical tasks in assessing the structures’ performance. The necessity of assessing the structure’s behavior for operability in the base - foundation - elevated system is proved.
The base soil local sagging zones’ influence assessment on the water retaining structure’s operability
Authors: Degtyareva O G , Vasiliev S M
Published: September 2020

The base modeling using the elastic-ideal-plastic Mora-Coulomb model made it possible to evaluate the vertical displacements in the presence and absence of local subsidence. It was established that the influence of local sagging in the second and third zones does not significantly affect the vertical displacements recorded on the pile grillage’s surface.
Assessment of the hydraulic structures’ technical condition by means of the amplitude-frequency characteristics’ analysis
Authors: Degtyarev G V , Abdrazakov F K , Lavrov N P
Published: September 2020

Based on the numerical simulation of the structure, a decrease in the frequency was revealed with an increase in the number of defective sections. A change in the deformed oscillation pattern at the corresponding frequencies is observed. The method clearly makes it possible to increase the hydraulic structures’ efficiency.
Possibilities of a dynamic survey method for hydraulic structures
Authors: Degtyarev V G , Degtyarev G V
Published: September 2020

Establishing the category of a hydraulic structure’s technical condition is an urgent task that constantly requires solutions during operation. Both the operating costs and the safe operation will largely depend on the choice of a survey method and its reliability and validity. The method of structural dynamic diagnostics, which is becoming more widespread, is promising and relevant, however, based on the relative novelty of the method, its application requires closer attention, including consideration from the standpoint of numerical modeling.
Oscillations of the variable cross beams under seismic and technogenic influences (part II)
Authors: Kulterbaev Kh P , Baragunova L A , Shogenova M M , Bulanov S G
Published: September 2020

The forced transverse oscillations of the variable cross section compressed beams under seismic and technogenic impacts are considered. The source of oscillations is the kinematic perturbations of the beam ends in the form of a harmonic or random vector process. The mathematical model of oscillations is presented as a boundary value problem from the basic partial differential equation of the fourth order hyperbolic type in spatial coordinate and the second order in time, which is supplemented by the boundary conditions. The beam fluctuations are interpreted as the spatiotemporal random fields inhomogeneous in space and stationery in time. In the deterministic case, the amplitudes of the forced oscillations are determined, the influence of the kinematic disturbances’ frequency and the beam oscillations’ shift of their phases is studied. In the stochastic problem, the standard deviations for the deflections are calculated, the influence of the characteristic frequency and correlation of the components of the vector perturbation process on the deflections’ output function is studied. The problem is solved by the methods of the variables’ separation, finite differences and the theory of random processes. The examples are considered, the conclusions are drawn from the calculations results in the Matlab computing complex environment.
Parametric research of the two-layered grouted shells’ bearing strength
Authors: Zhurtov A V , Bashiev A M , Dzhandigov U A , Mazikhov R V
Published: September 2020

The results of the two-layer reinforced cement shells’ bearing strength parametric study under the temperature and power effects of a standard fire are presented. The influence and the magnitude dependence plots of the power load, concrete class and the thickness of the shell layers on the structure’s bearing strength are revealed. The optimal thicknesses of the structural and protective layers of the shell, as well as the cement-cement layer concrete grade, are determined.
Deflection of beams with sinusoidal perforation
Authors: Pritykin A I
Published: September 2020

The presence of cutouts in the beams’ walls made of steel or from modern composite materials reduces their shear stiffness and increases deflections in comparison with beams of the same size with a solid wall. In this paper, we study the deflections of perforated beams with a sinusoidal shape of cutouts, which are widely used in construction recently. The cutouts’ effect on the perforated beams’ transverse bending was investigated analytically using the theory of composite bars and the finite element method. The aim of this work was to obtain an analytical dependence that allows to reliably evaluate the deformations of the beams with hexagonal cutouts with different angles of rounding. The study was conducted for the beams of different sizes, made by the non-waste technology from a rolling profile. An analysis of the calculating results for the beams made of different materials showed that with a decrease in the material elasticity modulus, the deflections of the beams increase, and a change in the yield strength of the material does not affect the deformation characteristics. The obtained dependence is applicable for the beams with a relative length l/H ≥ 10 at a relative cutouts’ height h / H = 0.667 The discrepancies with FEM results do not exceed 1.5-3%.
Assessment of the pit influence area on the stress state foundations of the nearby buildings
Authors: Tkachenko A V , Yudina I M
Published: September 2020

The article solves the problem of the stress state of a heavy half-plane, weakened by a semicircular recess (modeling a foundation pit) and under the influence of a uniformly distributed load (modeling weight from a nearby building). The solution was obtained in a closed form. Visual calculations results in the form of diagrams and isolines of the total voltage are presented. The resulting solution made it possible to consider two practical problems. In the first statement, to assess the pit parameters’ influence on the components of the additional voltage in the corner zone of the distributed load. In the second statement, to assess the distance influence from the pit to the load on the additional voltage components. The analysis of the obtained solutions is carried out. The quantitative character of the change in the additional stress components, on which the dimensions of the influence zone of the construction pit and the existing buildings foundations’ deformation is of particular practical interest.
Experimental studies of the “foundation-soil” system operation with sudden loading
Authors: Diakov I N , Tsarenko N V , Diakov M I
Published: September 2020

The experimental studies’ results of the foundations with a soil base interaction are presented. The relevance of the research is associated with increased accidents of buildings and structures in recent decades. The reasons for the occurrence and features of sudden foundations loading are considered. The experimental research methodology, the characteristic models of foundations are presented. The preliminary experimental studies’ results of the foundations with sudden loading are presented and analyzed. Some features of the “foundation-soil” system are determined. A decrease in the bearing capacity of the foundations during sudden loading, depending on the level and prestressing type, was revealed. It is established that the main reason for the decrease in the foundations’ bearing capacity is a change in the normal contact stresses diagram. The necessity and directions of further research in this area are substantiated.
Complex model of fractal architecture building
Authors: Kravchenko G M , Pudanova L I
Published: September 2020

The fractal structures paradigm is applicable for creating the complex architectural objects. Using special programs, it is possible to implement a comprehensive model of the fractal architecture building as a structure consisting of an endostructure and an exostructure. During the study, the first two iterations of the endostructure on the possibility of using such structures’ element as a supporting skeleton of a fractal architecture building were considered. The endostructure elements of the first iteration strengthen the exobase and the lower surface of the f-quarks of the exostructure. The endostructure of the second iteration is much more complex and voluminous than the structure of the first iteration and strengthens the upper part of the exostructure. To ensure the stability of the fractal architecture building, the framework is formed by connecting the elements of the endostructures of the first and second iteration. Based on the fractal structures’ formation analysis results, the unique building stiffness cores formed from the f-quarks exobase have been developed. The strength and rigidity of the building is ensured by the combined action of the endostructure’s elements, the exostructure’s elements and the developed stiffness cores. Comprehensive building model was implemented in ANSYS PC. According to the numerical experiments’ results, the maximum displacements, shapes and frequencies of the fractal architecture object’s natural vibrations are determined. The proposed design solutions for a complex model of a building based on a fractal structure are unique and require the use of innovative technologies and materials.
Engineering solutions for the reinforced concrete structures’ reinforcement of a multi-storey administrative amenity buildings
Authors: Voronkova G V , Rekunov S S , Arzamaskova L M , Evdokimov E E
Published: September 2020

The paper considers the reinforced concrete structures’ reinforcement of an administrative industrial amenity building facility that received damage during their operation. The main results of the technical survey of the facility are described with a description of the structural damages’ possible causes. The proposed atypical reinforcement of the load-bearing structures contains the changes in some design solutions in two versions, which ensure the facility’s further safe operation. Based on the performed analytical calculation, the design solutions to restore local damage and deformation, as well as to ensure the overall spatial rigidity of the structure have been developed. The technology for performing restoration work is described in detail.
Integrated construction and technical structural analysis of the industrial buildings
Authors: Serebryanaya I A , Egorochkina I O , Shlyakhova E A , Matrosov A A , Serebryanaya DS
Published: September 2020

The article presents a draft program of a comprehensive construction and technical examination of the industrial building structures. The features of the construction and technical examination of the industrial building structures are described. An algorithm of the sequence of actions for the technical examination of the object structures is developed. The measures to repair and restore the working condition of the damaged structures have been developed.
The experience of the regional culture objects and ethnodesign methods’ regeneration in the reconstruction activities’ implementation
Authors: Naumova E G , Naumov N V
Published: September 2020

The relevance of the work is due to the need to study the regeneration experience in the objects of regional culture and the need to study the methods of ethnodesign in measures to preserve the historical and cultural heritage that can create a new type of ethnocultural landscape of the 21st century. The purpose of the work is the study of various methods and techniques of modern ethnodesign in building an ethnocultural pattern, proposing the specifics of its traditional morphogenesis. The work uses the methods of historical and cultural analysis, methods of comparative analysis. The result of the study is to identify the most effective methods of ethnodesign in the regional culture objects regeneration complex measures, as well as the influence of the interaction summarizing effect of the applied techniques for the project’s successful implementation - the effect of which significantly exceeds the effect of each separately applied technique. The result of the study is the disclosure of the complex method mechanisms of reconstructing the historical ensemble of an ethnographic settlement – the problems are not solved by the targeted measures to preserve and restore individual objects, but in a complex of historical buildings and cultural landscape. The studies have shown the important role of deep study and comprehension of oral and written sources in the process of creating the ethnodesign objects that have authenticity and the ability to model the spiritual culture.
Neoclassical trends in the Don region cities’ architecture in the early twentieth century
Authors: Pisarenko S A , Dagldiyan K T , Lukyanov S V
Published: September 2020

The purpose of the article is to consider and analyze the stylistic features of neoclassicism, manifested in the architecture of the Lower Don cities in the early twentieth century. To achieve this goal, literary sources were studied and a visual analysis of the architectural objects of the period under consideration was carried out. The article describes the factors that influenced the formation of neoclassical trends in the Don region in connection with the general dynamics of the architectural development and the peculiarities of its socio-economic and cultural situation at the time. The interrelation of various conditions that affect the choice of options for volumetric, spatial and artistic solutions of architectural monuments of the first two decades of the twentieth century is analyzed depending on their purpose and the general urban situation. The analysis of the used stylistic means and plastic features of the Don region the most significant architectural structures appearance related to pre-revolutionary neoclassicism was carried out. In the final part of the article, the conclusions regarding the regional architecture neoclassical monuments’ features in comparison with the capital’s architectural structures of this period are drawn. In particular, it is noted that, unlike many metropolitan architectural designs, in the buildings built during this period in the cities of the Don Territory, a mixture of stylistic means is often observed due to the regional specifics. The modern look of the Don region cities (primarily their historical part) is largely determined by the neoclassical architecture monuments, and the consideration of their features is necessary when developing the new architectural solutions designed to ensure the comfort for the urban environment.
Technologies for decorating the walls’ surface in timber-frame housing construction
Authors: Zakharova N Yu , Vlasova I M , Lukyanov R L
Published: September 2020

The article discusses the features of decorating the surface of walls in wood-frame housing construction, taking into account its features, improving technologies and the interchangeability of materials and structures. The importance of low-rise construction in Russia in the context of government decisions is indicated. It analyzes the current state of the finishing materials’ range for wall decoration and their evolution. The formulations of binders, soils and methods of their application are given.