The redistribution of moments provides an attractive alternative to nonlinear methods of analysis. There are significant differences between design standards for moment redistribution. This work attempts to establish appropriate constraints on the permissible redistribution of moments in reinforced concrete structures. The article influences of some factors on the levels of redistribution of moments in statically indefinable reinforced concrete beams are considered. An equation is obtained for determining the allowable level of moment redistribution taking into account the requirements of compliance and the limit of plasticity. The influence of the dependence of the permissible angle of rotation in the plastic hinge is shown. An analytical model is being developed to calculate the coefficient β, the allowable percentage of the moment reduction in the area due to the redistribution of the moment. The model is compared with the experimental results and shows good agreement. The maximum limit for β is 20%. For the limiting state, with a favorable combination of parameters, the model will allow β to exceed 50%.

The derivation of a finite element model to determine the stress-strain state of a multi-storey building made of monolithic reinforced concrete is considered. This takes into account the dependence of the mechanical characteristics of concrete on the type of stress state, the development of plastic deformation in the reinforcement, cracking. The equations of state for the nonlinear isotropic materials proposed in the framework of the theory of A.A. Treschev, based on the parameters of the normalized stress spaces, accepted as defining relations. The characteristics of the material are determined from experiments on uniaxial tension and compression under simple loading conditions. Especially for the solution of this problem, a modification of the triangular hybrid finite element was developed for a plate of medium thickness of an arbitrary shape with five degrees of freedom in the node. The necessary equations of the finite element method for solving the problem of calculating the stress-strain state of the building taking into account the cracking, the different resistance of concrete and plastic deformations in the reinforcement obtained. The description of the methods of modeling the fictitious layers of the element corresponding to different variants of the stress-strain state of reinforced concrete: concrete layers without cracks, concrete layers with cracks, concrete layers without cracks and reinforced concrete layers with cracks in one and two directions. The results of solving the problem in form of graphs of the distribution of individual displacements in the slabs of the building. Confirmed, that taking into account the complicated properties of the material are necessary to obtain correct estimates of the stress-strain state of reinforced concrete structures under conditions of progressive cracking.

In result of experimental research the plots of the deflections and rotation angles, the dependency of deformations of concrete according to the testimony of the outlets of electrodesorption with respect to the calculated cross sections 1-1. The main deformations of elongation and shortening of concrete were determined; the reinforcement was selected in such a way that in the stage preceding the destruction, it reached fluidity, so the stresses in the reinforcement are known. It is established that for reinforced concrete structures made of high-strength concrete of square cross-section during torsion with bending, as a rule, there is only one main crack (the fragilestructure of high-strength concrete contributes to such a concentration), along which the destruction occurs. For the box section there were several cracks, of which stands out the one on which the destruction occurs. On the steps preceding the destruction, this crack begins to prevail over the rest and has s maximum opening width. On the basis of experimental studies of reinforced concrete structures made of high-strength concrete of square and box sections, reliable data on the complex stress-strain state in the studied areas of resistance, such as: the values of the generalized load of cracking and destruction ; its level relative to the limit load; the distance between the cracks at different levels of cracking (up to the moment of destruction, as a rule, two or three levels are formed); crack’s width at the level of the axis of the working rebar, at a distance of two diameters from the axes of the rebar and along the entire crack profile at various stages of loading, from which it follows that the crack opening at the level of the axis of reinforcement in 2 - 3 times less compared width the crack opening on the removal of 1.5 - 2 diameters of the working axis (longitudinal and transverse) reinforcement; the coordinates of the points (x; y; z) the spatial formation of cracks; schematic sketchers for tablets occurrence, development and opening of cracks of reinforced concrete constructions in torsion with bending. Thus, the experimental studies and the result provide an opportunity to test the developed computational model and its working hypotheses for assessing the resistance of reinforced concrete structures made of high-strength concrete in torsion with bending.

This paper presents the results of studies of the bearing capacity of corrosion-damaged concrete slabs subjected to freezing-thawing. The function of damage of reinforced concrete structures is developed. The results of studies of the bearing capacity of corrosion-damaged concrete slabs subjected to freezing-thawing over time (years) are presented. Experimental data on full-scale tests of reinforced concrete slabs with actual strength characteristics of concrete and partially corroded reinforcement are presented. The graphs of dependence: reduction of concrete strength and working section of reinforcing bars depending on the time (years) in the climatic conditions of Moscow. Strength characteristics of concrete in zones of compression and tension after statistical processing on a probabilistic basis of security are approximated by exponential dependence. On the basis of testing a series of plates of different schemes, the indicators of the function of concrete damage for a given time. The obtained results can be used to assess the strength and deformation characteristics and bearing capacity of reinforced concrete slabs subjected to cyclic freezing-thawing.

The study is based on the identified archival and printed sources, the field research of the author, which allows for a more reasonable reconstruction of the figurative and material structure of the lost noblemen and merchant estates.1st half of the 18th century was a powerful platform for the development of further growth and development of the estate life of the Kursk region, mainly of the nobility. The next period is the 2nd half of XVIII- 1st half of XIX centuries, rightly called the “golden age” of the Russian estate, for the Kursk region, as well as for other regions of the country, was the heyday and increase of possessions, estate economy, quality of new construction and reconstruction of existing estate complexes and various forms of estate life. The identified typological characteristics of Kursk estates, their progressive significance for the estate life-style of the studied region are innovative. The particular significance of the comprehensive research work is due to the possibility of filling the lacunae in the study of important pages of the history of national and regional Russian culture, reflected in the formation of regional features of building techniques and imagery of architectural ensembles of the Kursk region.

Evaluation the prospects of Donbas’s coal mines dumps using in the building materials production by the radiation factors was performed in the paper. The work has carried out an assessment of the prospects for the use of dump rocks in the construction industry from radiation indicators. The specific effective activity of natural radionuclides in the five coal mines waste dumps of Luhansk region was determined by the gamma-spectrometric analysis. Was shown the waste rock can be used without restrictions in residential construction with such radiation characteristics. The laboratory method of determination the radon emanation coefficient in the rocks and materials was described. It allows estimating accurately the radon entry rate into the premises from walling materials at the design stage of a construction.

The article presents the results of research on the development of new mineral polymer composite materials. In the production of composites by extrusion, fly ash is used from the combustion of coal at thermal power plants as a filler and polyvinyl chloride as a binder. The properties of fly ash are investigated from the point of view of its applicability as a filler. The results of investigations of the physical-mechanical and consumer characteristics of the developed materials are shown. The commercial production of the resulting polymer composites should have a significant impact on the environmental safety of the Baikal region, as it will consume significant amounts of industrial waste.

Theoretical research is the transition to modern software programs, associated with complex knowledge and practice. It is shown that to study the introduction of modern software systems in the educational process, as well as to improve the structure of the teaching of the discipline "Reinforced concrete and stone structures", built on the basis of the process of solving the problems of calculating and designing the reinforced concrete frame of a single-storey industrial building. The scientific research used, in the basis of the methodology of fundamental analytical research. The given data on the nature of the works performed, including the possibilities of the algorithm for modeling the spatial design scheme of the classical framework of a single-storey industrial building, which helped in the study of many objects of research in the direction "Construction". In the process of studying, several hypotheses about learning were adopted. In the course of the study, a wide range of important issues were revealed that could, if further study of this topic, be the subject of research. The question of working in the spatial scheme of double-stranded columns at the moment is still relevant.

The problem of increase in effectiveness of functioning of computer-aided engineering systems and quality management of projection in the conditions of the technological capabilities of the design organizations, which changed now, is represented extremely important. In this regard in structure the principles of creation of models, technologies and algorithms of high-quality projection of construction objects on the basis of the new paradigm biosferno the compatible and developing person of the city (city planning) created and developed now in the Russian academy of architecture and structural sciences are formulated. A key feature of estimated models is inclusion in the system of special mechanisms of interaction the designer - a system, sequentially interdependent principles constructed on a system hierarchy of points, positions - actions when functioning a CAD for quality ensuring project works and safety of designed projects.

The work is devoted to the study of the influence of clay minerals from the sands of various deposits on the efficiency of polycarboxylate superplasticizers in cement systems and on the properties of cement stone. The results of studying the composition of clay minerals in the sands of different deposits of the Chelyabinsk region are presented. It has been established that the effectiveness of polycarboxylate superplasticizers decreases the clay mineral montmorillonite to a greater extent. An assessment was made of the possibility of using various sands containing up to 2% clay minerals in order to obtain high performance concretes. To ensure the high efficiency of polycarboxylate superplasticizers in concretes on cement binders, it is necessary to use washed sands.