The results of the calculation of a reinforced concrete beam on an elastic foundation are presented. The physical (strength) and geometric distributions of the parameters of the reinforced concrete beams and foundation soils are given, as well as the probabilistic parameters of the opening width of normal cracks. A model of deformation and fracture of a reinforced concrete beam is considered depending on the magnitude of the bending moment acting in the cross section. The probability of breaking the beam from the action of the bending moment is obtained.

It is proposed the program and methodology for experimental studies of reinforced concrete structures under the action of torsion with bending. The main purpose is to check the calculation assumptions and to determine experimentally the design parameters of the proposed calculation method. Experimental studies have been carried out to check the proposed calculation apparatus and refine the regularities for determining the deflections, the angles of rotation of the cross-sections, and the stresses in the compressed zone of the concrete. The article presents the most typical scheme for the formation and development of cracks in the unfolded form, as well as characteristic graphs of the angles of rotation of the end cross-sections of structures for analysis.

In design of reinforced concrete buildings for seismic loads the possibility of the elasto-plastic strains appearance is supposed. In order to evaluate the limit state of constructions and possibility of their destruction the complex of criteria is necessary. One of them is the criterion preventing the formation of through cracks in bending elements due to plastic deformations of re-inforcement. The limit value of the coefficient of plasticity by curvature of bending sections is rec-ommended as this criterion. The method of design of normal sections of bending elements under al-ternating cyclic loads has been developed. On a basis of this method the dependences of limit val-ues of coefficients of plasticity from reinforcement factor of rectangular and T-sections have been determined. On the basis of obtained results practical recommendations are given for limiting of reinforcement factor of bending elements under alternating cyclic high intensity loads.

The paper analyzes the combined action of stone arches and walls, which exert a unloading effect on the arches. The finite-element model of the Wallen-Delamot arch was designed for the effect of the load of the overlying masonry. The load action was taken into account both from a combined finite element model with a rigid connection of the arch and overlying masonry, and from the gravitational load transferred to the arch. The dependences of the maximum acting stresses in the arch on the modulus of elasticity of the overlying masonry are constructed, reflecting the behavior of the damaged masonry, which lost rigidity properties. It is shown that when the modulus of elasticity decreases to 5-10% of the initial one, significant changes occur in the stress-strain state of the entire structure. The obtained results demonstrate that when the arch is loaded with a gravitational load and there are no restrictions on the overlying laying of vertical and horizontal displacements, the stressed state of the arch differs significantly from its state when modeling the entire structure.

The correlative properties of the geometrical characteristics of the structural elements’ cross sections ( GCCS ) have investigated. The methodology have worked out for determining the correlation coefficients ( indices ) of GCCS with arbitrary shapes, rational use of which in probabilistic analysis of structures makes it possible to simplify taking into account the stochastic variability of building structures’ local geometry. Numerical values have obtained for the correlation coefficients of the standard steel rolling profiles’ GCCS that are missing in the normative and technical literature and which together with the GCCS coefficients of variation ensure the correct inclusion the description of the sections geometry’s probabilistic properties in the design models. It was shown by solutions of test problems that for certain combinations of random design parameters of the building system, the correlation of the GCCS significantly affects the results of probabilistic analysis and reliability ( or probability of failure ) estimations. The recommendations on the use of the obtained data on the correlation of GCCS in practical designs of buildings and structures are given.

The results of testing of structures made of multilayer heat-strengthened glass are presented. The problems of calculation for central compression, bending, bending compression and stability of multilayer glass structures are considered. Descriptions of the design scheme of the considered structures and features of multilayer glass are given. The estimation of the existing methods of calculation, numerical modeling and their comparison with the results of the experiment. The research topic is substantiated.

The question of calculating the conjugation of structures of a typical panel part of a building with skeleton structures of lower non-residential floors is considered. On the basis of theoretical and experimental studies of wall panels of the first non-residential floors with large openings, a method of constructing a computational model for the case of frame structures of the first non-residential floors in the ANSYS PC is developed. A comparative analysis of the methods for constructing a computational model of a fragment of a panel building with lower frame floors using the elements of one-way links in PC LIRA and nonlinear elements in PC Ansys is carried out. The analysis of the features of the work of prefabricated and monolithic structures in the area of their interface and the elements of the overlying floors adjoining them are analyzed. The main problems that arise when simulating the conjugation of the constructions under consideration are indicated, and general recommendations for their calculation are given.

Distribution and influence of harmful substances from gas stations on the nearest building taking into account aerodynamics of wind streams is insufficiently investigated. The study of the process of distribution of harmful substances in situ causes certain difficulties. The authors, based on the previously obtained results of theoretical and experimental studies, performed a numerical simulation of the spread of pollutants released from the gas station, and the analysis of their impact on nearby buildings, taking into account the flowing air flows. The results obtained with the help of numerical simulation make it possible to assess the state of the environment at any point and at any distance from the gas station and to predict the degree of influence of air pollution on the environmental safety of residential buildings in the construction of gas stations. With the help of numerical modeling it is also possible to evaluate the effectiveness of the implementation of planned measures to reduce the negative impact of harmful substances from the gas station.

The article substantiates the version of the origin of architecture in the process of human exploration of the wild nature, finding in it the most favorable for his life sites and feasible arrangement of them. In ancient times, people worshiped the forces of nature and did not feel themselves masters of the earth. Subsequently, extensive conquests and the creation of huge monarchist states inspired faith in the power of man. The great mono-theistic religions stimulated the affirmation of universal anthropocentric thinking. And when the New time came with his scientific discoveries and technical achievements, the man became proud. The cause of many intractable problems of modern civilization has become a consumer attitude to the resources of the Earth and its bio-sphere. The author comes to the conclusion about the need to return on a new basis to the original traditions of nature, which should change for the better the mentality of society and help to overcome the crisis phenomena in modern urban planning and architecture.

Article purposed to investigate and determine the features and conditions in which evolved Voronezh architecture mid XIX-the beginning of XX centure. Analysis of the historical, socio-economic and cultural context gives the possibility in a wider range to determine the origins and nature of the origin of eclecticism and further stylistic transformation architecture based on the example of the provincial the city of Voronezh. Specific materials, analytical tables, dates and figures obtained through the study of a large number of archived historical documents and sources. Actual material reveals a panoramic picture of the historical period under consideration and evolutionary processes in the Voronezh architecture of XIX-beginning of the XX centures.

The paper presents the basis of the analytical model for calculating the loss of strength cement compositions in the high temperature development. This model is proposed to replace the classical method of calculating the fire resistance of the loss of load-bearing capacity (R). The experimental data were taken as initial indicators. On the basis of these calculations, it is possible to predict the occurrence of ultimate states by loss of strength, and to estimate the reliability of practical indicators that were obtained as a result of full-scale tests. It became possibility to apply the developed approach to assessing the fire resistance of new developed materials, for are not available reference data. At real fire conditions, it becomes possible to estimate the moment starting repair due to the loss of strength if available data of the building material properties and the dimensions the building structures.

Currently, basalt fibers are used in construction as a dispersed reinforcement of concrete and reinforced concrete structures in high-rise buildings, bridges, airport runways and highway pavements. Mass production of high-strength concrete in Russia is largely associated with the use of organomineral modifiers of the MB and Embelit series containing microsilica, fly ash, curing regulator and superplasticizer C-3 in different proportions. The research of features of high-strength concrete (with 1% of basal fiber and without basalt fiber), manufactured with the use of modifier MB10-30C, was made on samples with detentions 100x100x100 mm, 100x100x400 mm, 100x100x400 mm with the artificial crack of 25 mm deep in the middle of the span, and also 100х75х400 mm (75 mm height was taken equal to the height of the section above the crack of the 2nd type of prisms). The compressive strength, the tensile strength at bending, the strength at axial tension, the cracking moment, and also the characteristics of fracture mechanics, such as: the critical stress intensity factor and the critical energy release rate, in various periods of curing (7, 14, 28 and 60 days of curing) were determined under the research. Influence of cracks in the bending element on the value of the cracking moment was also determined under the research. The research results show that the use of basalt fibers in MB10-30C modifier based high-strength concrete resulted in a decrease in the compressive strength, but at the same time, enhance the tensile strength