Analyzes national experience of restoring the old buildings floors. An assessment of the wood-reinforced concrete using experience, steel-reinforced concrete floor structures and methods for calculating load-bearing elements of a composite section is given. It is noted that the current design standards and existing methods for calculating steel-reinforced concrete structures of civil buildings and bridge structures use simplified calculation methods and do not reflect the actual stress-strain state of a bent element, do not take into account the initial pre-operational deformations and stresses, and do not lead to economical design solutions. Sometimes they lead to incorrect results. Expressions of internal moments and forces of steel-reinforced concrete bending elements are presented from the equilibrium conditions of a composite element, taking into account pre-operational forces. The results of our own experiments are presented, where it is shown that during the hardening of concrete, beams and slabs receive deformations in the form of reverse deflection (bending), and internal stresses arise in the sections of steel-reinforced concrete elements. Formulas are given for calculating the deflections of bending elements taking into account their initial deformations.

To compare the calculation results of the proposed method for calculating steel-reinforced concrete elements, taking into account the initial deformations and stresses, the data of our own experiments were used and comparisons were given. Satisfactory convergence of the results is shown.

Reliable assessment of the strength and deformations of concrete under multiaxial stress states is important for increasing the accuracy of analysis and design. Classical strength theories do not work for such materials as concrete due to the complex shear-pryout mechanism of its structural failure. Description of the key relations of strength criteria established by G.A. Geniev, G.A. Geniev -N.M. Alikova, E.S. Leites, A.V. Yashin, S.F. Klovanich - D.I. Bezushko, K.J. Willam - E.P. Warnke and N.I. Karpenko is given. Assessment of the compliance of the design strength with the experimental data under uni-, bi- and triaxial stress states is made. Strength criteria that most closely describe the experimental data in the specific areas of the stress state are determined. It has been found out that the most developed strength conditions are the ones developed by S.F. Klovanich - D.I. Bezushko, K.J. Willam - E.P. Warnke and N.I. Karpenko. The criteria introduced by E.S. Leites and A.V. Yashin describe the experimental data under conditions of the plane stress state with sufficient accuracy. The strength conditions established by G.A. Geniev and G.A. Geniev - N.M. Alikova require careful use, taking into account their deviations from the experimental data in certain areas of triaxial stress states. Loading programs in the process of experimental research of concrete strength aimed at identifying the forms of functions of meridional and deviatoric curves more accurately have been determined.

The features of the effect of wind on a prismatic-type building with different methods of determining the coefficient of wind pressure along the height are considered. The study was carried out on the basis of studying the main provisions of regulatory documents governing design and development activities in the Russian Federation, as well as current publications of domestic and foreign scientists, corresponding to research in this area. The research method is structural and analytical analysis using the correlation dependences of the factors under study. Analytical dependencies for determining the wind forces for various methods of assigning the wind load coefficient along the height of the building and their graphic interpretation are given. The work is based on the provisions of domestic building codes and relevant information contained in other domestic and foreign sources. For prismatic buildings with a height of up to 80 meters, there are areas where the forces from the main wind load significantly depend on the method of its determination. The conducted research indicates the ambiguity used in the practice of designing the parameters of the wind load, allowing the possibility of excess or underloading of structures or individual elements.

A methodology and an algorithm for calculating the survivability parameters of a long-term deformable reinforced concrete building frame in extreme states are presented. Analytical dependencies for determining the value of the creep measure are taken in accordance with the use of approximate dependencies from the recommendations of the NIIZHB. On this basis, a method is proposed for determining the cross-section bending stiffness of the frame elements. The deformation criterion of a special limiting state is formulated taking into account the nonequilibrium processes of prolonged deformation of the structural system elements. The numerical analysis results of the longterm deformable reinforced concrete frame survivability potential with a sudden removal of the one structural element, taking into account the long-term deformation prehistory of the considered building frame under an operating load, are presented. The exposure of the structural system survivability from the its loading moment to its transformation into a kinematically variable system has been determined.

Dynamic strength criteria and crack resistance criteria are given for a typical plane-stressed reinforced concrete element with prestressed reinforcement in one direction. The criteria are constructed by generalizing the theory of plasticity of concrete and reinforced concrete G.A. Geniev on the area of existence of tensile stresses: "tension- tension" and "compression- tension". In general terms, the crack resistance condition and strength condition of a prestressed reinforced concrete plane-stressed element are presented in the form of an ellipse in the coordinates of the main stresses. In this case, in contrast to the criteria of crack resistance of a flat unstressed element, the principal axes of the ellipse don't pass through the origin. The results of a comparative analysis of the calculated and experimental data on crack resistance and strength for prestressed reinforced concrete in the support zone of the beam of a monolithic reinforced concrete frame tested for a given design load and a special dynamic effect are given.

The article presents the results of experimental research and computational analysis of a reinforced concrete spatial frame - a fragment of the frame of a multi-storey building in limiting and out-of-limit states. A series of tests for design and beyond design impacts was performed at the stage of construction without cracks. The dynamic calculation of the considered structural system was carried out in the mode of direct integration of the equations of motion. The features of frame deformation before and after the beyond design basis impact, causing a sudden structural restructuring of the structural system, have been established. Satisfactory agreement of the calculation results with the test results is obtained.

The objectives of the study were the questions of the prerequisites for the renovation of the coastal territory of Volgograd for the formation of sustainable development of the territories of the Volgograd agglomeration. The article presents the results of an urban planning analysis: functional zoning of the embankment territory; a scheme for the reorganization of the territory within the boundaries of the concept development; a scheme for the classification of green areas and retrospective material. The article substantiates the relevance of the development of urban recreational spaces, coastal areas, transformation and modernization of existing buildings in the context of solving the problems of urban development. The requirements for evaluation for each characteristic indicator that affects the transformation of the existing image of Volgograd to increase the tourist potential are given. It is established that the planning and architectural and spatial solutions of the Volgograd embankment are pedestrian-transport - two-tiered: the upper and lower tiers have different functional purposes.

The research is based on identified archival and printed sources, field studies of the authors.

The scientific novelty and significance of the study is based on the identification of archival and printed sources that allow for a more reasonable reconstruction of the figurative and material structure of the lost elements of the main manor house of the estate of A.S. Shumakov in Kursk.

The research was carried out at the expense of the State Program of the Russian Federation "Development of Science and Technology" for 2021 within the framework of the Plan of Fundamental Scientific Research of the Ministry of Construction of Russia and the Russian Academy of Sciences, topic 1.2.2.

Large-block porous ceramics, which enter the market of building materials, have a number of undeniable qualities: low thermal conductivity, low density, high aesthetic qualities. According to its design features, this material is a modern prototype of hollow bricks used in construction since the nineteenth century. Field studies of the work of enclosing structures using hollow bricks have shown that in many cases, the bricks laid in the enclosing structures of buildings 60-80 years ago were significantly destroyed. In this case, the destruction mechanism does not depend on the polythermal load on the material. The hypothesis that the destruction is associated with the chemical destruction of the material was investigated using the developed method for determining the chemical resistance of the material of wall ceramics. The conducted studies confirmed the hypothesis. Studies of the chemical resistance of the material of large-block porous ceramics should be taken into account in the production technology of ceramics.

Strict requirements for microclimate parameters and air cleanliness are imposed on warehouses, especially for food storage. Experience in the operation of storage facilities has shown the need for periodic dust removal of technological vehicles (electric cars and stackers), which is performed during maintenance by blowing compressed air and is accompanied by a strong dusting of the environment. In addition, the formation of fine dust in the pallet storage sections is observed.

The elimination of the noted drawbacks is effectively achieved by using activated exhaust hoods, which form weakly turbulent air jets that localize the source of pollution. To assess the effectiveness of the use of activated hoods, an integral method based on the laws of conservation of momentum, mass and energy was used. The example of a representative object illustrates the calculation of the parameters of activated exhaust hoods.

In this paper, based on the analysis of the results of field surveys of the acoustics of canonical prayer halls of the Orthodox and Muslim confessions, a proposal for an objective assessment of the specific sense of sacredness of religious events is developed. A new parameter for assessing this feeling is presented-the so - called "height measure" of the perception of the sound of the temple, with the method of its calculation and measurement. The relationship of this parameter with the known volume criteria of echo formations is estimated, depending on the geometry of the church (first of all, on the height of the main dome) and the signal-to-noise ratio for the characteristic areas of the parishioners ' accommodation.