The article is devoted to elaboration of the method of comparative analysis of steel corrugated web beams and I-section beams. For greater reliability of comparison beams with different width and thickness of the belts were considered. The comparison was carried out for 6 and 9 m spans at different values of load intensity. As a result of the study, graphs showing the dependence of normal stresses and metal content on the load value were obtained. The study allows to conclude that the efficiency of the application of corrugated web beams increases with increasing load, for small values of the distributed load, the forces in the usual profile will be less, but in all cases the corrugated web beams are more effecient in terms of metal content.

Keywords: sin-beam, corrugated web beams, steel design, analysis, efficiency of application

The article presents an analysis of the main methods of processing building structures, that contribute to the preservation of the strength characteristics under aggressive environmental influences, as well as the basic principles for calculating the parameters of cleaning materials with free abrasives.

Keywords: Free abrasive, particle, aggressive environment, dynamic impact, machining parts, probability estimate, contact patch, packing square, trajectory of movement, purification rate

In this review article high-rise construction is considered, factors affecting the choice of a constructive system of a building are given. The shell (box-shaped) structural system is described in detail. The advantages and disadvantages of this structural system are listed.

Keywords: high-rise building, structural system (CS), shell (box-shaped) system, horizontal load, stiffness, stability, bezreskosnaya grille, diagonal grille, column, strapping beam, diagonal connection

In article results of the analysis of method of calculation of flat plates of girderless floors are considered on breakdown according to the Russian and foreign design codes are considered. The analysis of the received results demonstrates that in the considered calculation procedures on breakdown similar settlement models are used and identical power factors are considered. Namely the pressing-through effort and the bending moments operating in two planes. Taking note of the moments in various techniques is carried out in two ways. The first way – tangent tension is entered into settlement model. And each technique offers the form of an epyura of tangent tension. The second way – introduction to a condition of durability of the empirical coefficient considering influence of the bending moments. Approach to purpose of geometrical parameters of a settlement (critical) contour is not identical. Contours of different techniques differ in a form and the sizes. And the difference of the sizes is very considerable. It is established that work of knot of interface of girderless flag with a column is studied yet not fully and additional researches on generalization of calculation procedures are required.

Keywords: reinforced concrete, girderless floor, breakdown, working height of section, transversal armature, pyramid of breakdown

The article is devoted to the comparative analysis of the construction and operation of buildings of traditional shape and round shape in the plan. Given data on material costs in the operation of buildings of different shapes.

Keywords: shaping, round buildings, energy efficiency, square buildings, building shapes, heating, thermal protection

The results of the study of the stability of the core structure of a polygonal ring under the action of a system of self-balanced radial forces are presented. A complete solution of the problem is given in accordance with the fundamental equations of the theory of R. Mises as applied to a statically definable planar structure. It is established that the instability parameter of the core structure of the hexagonal ring is determined solely by the number of nodal points of the hinged rod system.

Keywords: core structure, regular polygon, hyperboloid, annular diaphragm, determinant, characteristic polynomial, cyclic symmetry

To date, the construction of the new techniques of construction of buildings and structures, as well as the most advanced durable and lightweight materials with high performance characteristics. All this allows you to build cost-effective, high-quality and aesthetically attractive houses. Depending on the materials used in the construction of multi-storey buildings was considered the effectiveness of ribbed coffered floors. Calculation of the 18-storey monolithic building was made in the program complex "Lira-CAD-2013". Floor slab typical floor is considered in the following schemes: buildings with a step of columns 6m and 12 m, the ceiling is flat and coffered with a 200mm plate 50mm, different beam cross-sections (200х400мм and 200х450мм), step 900х900 mm. analysis of the results showed that the most advantageous use of coffered ceilings in the building with a column grid of 12 m, with the use of high-strength concrete and reinforcement steel class A500.

Keywords: caisson ceiling, slab, beam, reinforcement, concrete, analysis, consumption, reinforcement, step columns, the cost of construction, structural scheme

This article contains a survey of the building in the city of Rostov-on-don. A detailed visual inspection of the object of study, assessment of the technical condition of the main bearing building structures, analysis of the causes of defects and damage, pre - installation of the category of technical condition. As a result of the survey developed recommendations for the design, measures to restore or strengthen the building structures.

Keywords: technical condition, categories of technical condition, inspection, visual inspection, detailed examination, building structures, defect, damage, repair, restoration, operation

In article the method of network seismic fields which allows to determine the geoseismic parameters of soil thickness giving seismic characteristic of soil is considered. The average values of speeds of longitudinal and cross waves characterizing the generalized geoseismic section are defined. On the basis of high-speed and density characteristics of soil calculations of increments of seismic intensity concerning parameters of reference soil are executed

Keywords: seismic characteristic of soil, speed of longitudinal waves, speed of cross waves geoseismic section, spatial borders of a geological object

The procedure of conducting judicial construction technical expertize of the real estate objects damaged as a result of flooding is considered, the main events held construction experts on the place of flooding and the necessary list of documents necessary to start a research are listed.

Keywords: flooding, judicial construction technical expertize, accident, the caused damage, judicial proceedings, the conclusion, recovery repair

In this article such spheres activity as independent fire examination and assessment of property are considered, distinctive features of each activity are considered. Basic elements of each of this field of activity by what documents is guided in work what activity are given

Keywords: the fire, property assessment, fire examination, the appraiser, the expert-builder, accident, the caused damage, judicial proceedings, the conclusion, recovery repair

The paper considers the feasibility of creating unique laboratories on the territory of radon anomalies. Today there is a need to create unique regional radon laboratories, where the existing buildings themselves will be an emanation environment (camera), inside which it is possible to conduct a wide range of studies. The construction and rapid reconstruction of such laboratories with the use of innovative materials can be more effective in comparison with traditional construction practices. As a building material is proposed to use a wooden building block for the construction of low-rise buildings. Buildings and structures of this unit are quickly erected without the use of specialized equipment. It is also easy to dismantle the building and transfer it to another location, which is necessary for radon studies. The article identifies two principal provisions. The first is the possibility and the need to create laboratory "reference" polygons on radon anomalies to study various technical, design or methodological solutions that can radically change the radon situation inside the model of a real building. It does not exclude the combination of functions of several laboratories in one. Second-the construction and reconstruction of such a "reference" structure can be more effective in terms of both labor costs and terms of work, in comparison with traditional construction practice.

Keywords: radioactivity, radon, anomaly, laboratory, landfill, construction, reconstruction, innovation, building block, precast housing, waste management

The article considers modern methods of seismic and seismic isolation. Traditional methods have long been used in construction practice, but special methods allow to significantly reduce costs and increase the reliability of erected structures. In modern design solutions, it is impossible to increase seismic resistance, only by increasing the cross sections, strength, and weight. New effective methods of seismic protection are required. Such solutions imply a change in mass and rigidity, damping the system depending on its movements and velocities. Thus, the use of seismic protection with proper design can significantly increase such characteristics as: building reliability, safety and reliability of equipment, economic indicators of the building.

Keywords: seismic isolation, seismic, seismic protection, damping, cost-effectiveness

Outlines the main provisions of the calculation of the stability of statically indefinable systems of regular structure. A planar structure with an external contour in the shape of a regular hexagon and under the action of nodal radial compression forces is considered. An analysis of the stability of the equilibrium state of the core structure is performed and the full range of numerical values of the instability parameter of the system is determined.

Keywords: core structure, regular hexagon, hinge system, characteristic polynomial, triangular panel

The results of tests of a series of single-shear samples of joints of wooden elements on inclined metal rods (IMR), in which plain washers transmit the force between the rod and wood, are considered. The intended bearing capacity of the NMS-connection is determined by taking into account changes in SP 64.13330.2017. Theoretically and based on experimental data, the stress-strain state of an IMR connection and the stress state of inclined steel rods are considered. The prevailing factors in the stress state of inclined rods are established. The estimation of the bearing capacity of IMR-connections on the rods with plain washers performed.

Keywords: Wooden structures, ductile connectionions, NMS-connection, inclined metal rods, intended bearing capacity, shearing load, tensile stress, ultimate breaking load, bearing strain under washers, safety factor

Creating a comfortable acoustic climate and an enabling environment for listening to music and speech is crucial in the acoustic design of home theatres. The main requirements for the acoustics of home theater halls are low background noise, diffuse sound field, no echo and optimal reverberation time. The reverberation time is calculated in a certain order. The acoustic mode of the home theater room is assessed in the process of acoustic design.Then the acoustic cladding and electroacoustic equipment are selected. The acoustic system and loudspeakers of a certain orientation are selected depending on the size of the room and the frequency of sound reproduction.

Keywords: acoustics, sound, sound field, home theater, reverberation time, sound absorption coefficient, sound absorption area, acoustic systems, loudspeakers

The article provides a rationale for the design and technological parameters of barns, which are fundamental in their construction. Design features of the building and the principles of the organization of the maintenance of cows in them are given and described. The design and technological parameters of barns, providing optimal conditions for keeping cows with their loose housing, are noted.

Keywords: loose cowshed; cowshed; parameters; row; type; aft table; manure; stalls; efficiency

This article analyzes the stress-strain state of exploited reinforced concrete crane beams in order to identify the causes of abnormal damages. Also, the degree of influence of the revealed damages on safety and operational fitness was assessed.

Keywords: crane beam, technical condition, operational availability, defect, durability, damage, inspection, discretization, stress-strain state

The possibility of using European standards, manuals and manuals for the calculation of elements of nodes of frame structures according to criteria that have not been reflected in Russian standards today is being considered. Numerical methods have been used to analyze the bearing capacity of frame nodes for various combinations of longitudinal forces and bending moments. The formation of residual plastic deformations in the elements of the nodes of the frame structures is considered. The nodes were calculated using the ANSYS software package, and a comparative analysis of the calculation results according to European and Russian standards was performed based on the results of the calculation. The question is raised about the need for further numerical studies of the work of steel frame assemblies, including the conduct of field tests, as well as the development of new methods for calculating frame assemblies with regard to plastic deformations. As a result of the calculations and calculations, the need to take into account the fatigue survivability of steel frame assemblies is established, which is associated with the probability of the occurrence of full design loads for the design life

Keywords: European standards, calculation of steel elements, nodes of frame structures, bearing capacity, plastic deformations, fatigue survivability, low-cycle design loads, full design load, redistribution of internal forces, flexibility of rigid nodes

The reorganization of existing coatings of public buildings into the “green roof” technology is possible in cases of the generation of an extensive type of green roofing system and, extremely rarely, of an intensive type. To clarify to the above, the load from the green roof of the extensive type in a water-saturated condition on the bearing part of the structural system of the building is 80 ... 100 kg / m2 with a substrate thickness of not more than 0.07 ... 0.15 m. Therefore, in most cases the introduction of this type of green Coverage in public buildings of the existing buildings is feasible.

Keywords: green roof, thermal resistance, strength of parts of the structure, functional zone, limit states, construction, technology and organization of construction

The article discusses the results of a survey of the technical condition of precast reinforced concrete columns of the building of the administrative building of the cotton mill in Shakhty. A calibration calculation for bearing capacity was made taking into account additional loads. Identified extensive damage the main ones are: - destruction of the protective layer of concrete, exposure and corrosive wear up to 10% of the cross section of the working and transverse reinforcement of columns; - cracks in the protective layer of concrete on the surface of the shelves of columns. The technical condition of the building structures of the administrative building for the period of the survey is assessed as unsuitable to the conditions of normal operation (partially operational). A calibration calculation was made and recommendations were developed for restoring the bearing capacity of precast concrete columns.

Keywords: concrete, bearing capacity, reinforced concrete, structures, reinforcement, constant load, strength, operational reliability, deformation, reinforcement

" The article presents research on the problems of construction and design of buildings and structures in the permafrost of Russia. Based on the research work, the principles of construction on permafrost soils are formed. It is shown that the design and construction of buildings and structures can be carried out, provided that the foundations of the soil remain frozen during construction and during operation, and in cases where the soil necessarily becomes thawed during construction or during operation buildings and structures."

Keywords: construction, design, permafrost, soil, foundation, structures, the Far North, climate, soil, building, structure

This article discusses the quality of final construction products and methods of its evaluation. Identified, proposed and justified the need for the introduction of a comprehensive quality indicator. On the basis of the analysis of the existing methods of quality control, it is proposed to create a Department in the service of the technical customer, which will deal with quality issues at all stages of the life cycle of the construction project.

Keywords: construction; quality; quality control; quality indicator; complex quality indicator; organization of construction production; project management; quality assessment; control over the maintenance of as-built documentation, obtaining permission to put the

A comparative analysis was made of the evolution of the development of facade glazing systems in the design of public buildings both abroad and in Russia. It has been established that both abroad and in Russia are characterized by the appearance of buildings with continuous glazing, the production of glass and double-glazed windows of a new generation: with magnetron application of heat-reflecting coatings and with energy-saving characteristics. The shape, size, placement of the glazed surfaces of the facade were determined by the climatic conditions, economic and scientific-technical development of the countries.

Keywords: Facade glazing, translucent facades, Bauhaus, Le Corbusier, stained glass, cold-formed glass, cold facade, exhaust facade, external natural factors

This article discusses a comparative analysis of the results of calculations of a building erected on an unevenly deformable base. The authors, taking into account the peculiarities of the engineering-geological conditions of the territory of the city of Volgograd, made a verification assessment of the influence of the heterogeneity of the bedding coefficient of the soil foundation on the VAT of the structural elements of the building when calculating the final draft.

Keywords: bulk soils, foundations, bases, bed ratio, backfilling, compliance, stiffness diaphragm, stress-strain state