In the period of sharp warming conditions can occur in which the temperature of the outer surface for some time will be below the ambient air temperature. While warmer ambient air, not in contact with the heated surface of the wall may cause condensation on the surface. The article discusses some of the exterior building envelope, in conditions of rapid warming and condensation process of moisture on the outer surface of the walls. With the help of finite difference method numerical modeling of the thermal regime of the outer surface.

Keywords: Exterior walls, non-stationary conditions, moisture condensation, winter

The article discusses the influence of the distance between the axes of pipes laid on the efficiency of the temperature distribution in the floor heating system. Using the computational experiment was simulated the temperature field on the surface of the floor heating. The calculations are performed using the program ELCUT.

Keywords: underfloor heating, numerical simulation, temperature field, the temperature of the feed piping system radiant heating

The effect of auto-displacement in a resonant-tunnel diode (RTD) on the dynamic range of amplifiers on these diodes is considered. Taking into account autosplacement, two possible types of amplitude characteristics and boundaries of their existence were revealed. For these two types of amplitude characteristics, expressions were obtained that determine the dynamic range of the amplifier. When using the amplitude characteristic of the first type, the auto-shift expands the region of existence of this amplitude characteristic and leads to a decrease in the dynamic range. For amplitude characteristics of the second type, a certain expansion of the dynamic range can be achieved.

Keywords: a resonance-tunnel diode, a current-voltage characteristic of a diode, a dynamic range, a gain factor, the degree of regeneration, and the power supply mode of an amplifier for an RTD.

To ensure sufficient strength, stability of buildings and structures, the possibility of their further normal operation, as well as during reconstruction, when it is necessary to increase the loads on existing structures, it is necessary to strengthen the damaged structures. Ways of strengthening and repairing damaged structures of buildings and structures can to a great extent differ both in technical and economic indicators and in the convenience of implementation, so that their proper choice in each particular case is extremely important. The article considers options for strengthening load-bearing building structures and verified computations for load-carrying capacity taking into account additional loads. The technical and economic comparison of the amplification variants in terms of the following parameters is made: the mass of the amplification elements; the cost of the basic materials needed to strengthen; labor intensity and cost of production; labor intensity and cost of performance of works on strengthening. Analysis of options for strengthening load-bearing building structures can help in choosing the method of reinforcing the load-bearing capacity of reinforced concrete bending elements.

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

The article deals with the problems existing in our country that arise in the construction of buildings and structures using new materials and engineering technologies. As shown by the analysis, one of the most significant problems in this area is the violation of production technologies using new materials. To overcome this situation, it is proposed to set the technological normal at the design stage by developing technological maps that take into account the composition and sequence of operations taking into account the properties of energy-efficient materials in detail. In Donskoy State Technical University (DGTU) is developing an intelligent management system that provides organizational and technological and information integration of the stages of design and production through the creation of a single database of technological maps, volumes of work and resources

Keywords: integration, database, the resource classifier, engineering, life cycle of construction products

In this paper we consider the bending of a plate on an elastic base. Plate in plan has a rectangular outline. The plate material is isotropic. The plate is supported by ribs of rigidity directed parallel to the sides of the plate. It is taken into account that ry-bra, rigidities parallel to different sides, have different rigidity for bending and torsion. The calculation scheme assumes an orthotropic plate having various cylindrical stiffnesses in two mutually perpendicular directions parallel to the reinforcing ribs. The elastic foundation is adopted by Winkler, ie. it is believed that the reaction of the base is directly proportional to the deflection of the plate at each point. The plate rests on an elastic base and is loaded with a distributed load according to the following law q=q_0*sin⁡〖2πx/a*cos⁡〖πy/2b〗 〗. The problem is solved by the inverse method. Function of deflections of the plate are: w=C*sin⁡〖2πx/a*cos⁡〖πy/2b〗 〗.The stress state is studied and the load-carrying capacity is calculated for various parameters of the plate and the base.

Keywords: ribs, plate, elastic base, inverse method, thin, orthonormal, bending, load-carrying capacity, strength

The article is devoted to the study of the location of buildings in the city of Rostov-on-Don,with considering the town-planning aspects of planning urban areas. In the process of research, a geoinformation database was created with the criteria for the location of residential buildings in various geological risk zones. As conclusions to the article, an analysis was carried out with the identification of the location of buildings in complex geological and environmental conditions within the city of Rostov-on-Don.

Keywords: Urban construction, density of construction, engineering and geological conditions, territorial planning, geoinformation database

To solve the economic, technical, environmental and social problems of the region, it is expedient to create a regional inter-branch finance and construction forestry cluster (IFSLP). The creation of a regional IFSLP facilitates the most effective use of the integration process in the allocation of investment resources in the region. Cluster education allows: - to create investment attractiveness of the region; - to organize new jobs - to attract young professionals with higher education - to use innovative developments - to increase deductions to the local budget - to clean the forest from dead wood and substandard timber, to generate heat and electricity, - to create a competitive export product.

Keywords: resource-producing complex, regional interindustry financial and construction forestry cluster, innovation, investments, forestry direction, construction materials

The imbalance in the development of the forestry, with respect to the valuable and non-standard woods used by the construction enterprises, entails an ecological catastrophe in the regions. For the wide use of hardwood in the production of building materials and products, a technology has been developed to direct the development of operational properties. Modification of the structure of the wood due to volumetric impregnation of capillaries helps to reduce water absorption, increase fire resistance and biostability of wood, and also contributes to meeting the growing needs of producers of wood-based building materials in a cheap local raw material quickly renewable resource base

Keywords: wood, construction, fire resistance, hardwoods, modified wood, biosphere

Now elements of natural structures of the world surrounding us form a basis for loan by their architects and designers in their professional activity. It is caused not only by esthetic appeal of natural objects, but also big functionality of their form providing high degree of durability, reliability, adaptation to the changing external conditions, comforts of their use as inhabited and production rooms. In this work the analysis of the VAT of an oviform envelope under the influence of sole weight and intrinsic pressure is provided.

Keywords: intense strained state, finite element method, oviform envelope, sole weight, intrinsic pressure, analysis, efforts, deformation

The review of existing nanomaterials for stabilization of clay soils is carried out. The possibilities and limitations of the known nanotechnological approaches to the stabilization of clay soils are analyzed. The influence of nanomaterials on the physical and mechanical properties of clay soils is described.

Keywords: soil, clay mineral, bearing capacity, soil stabilization, nanomaterial

The article presents the analysis of causes of accident of a water tower. Conducted examination of the structure showed the following: Water tower made in the form of welded sheet construction. Steel tank has a cylindrical shape, the diameter of the tank is 3020мм, cylindrical pole with a diameter of 1220mm and a height of 18m. The walls of the tower are made of sheet metal with a thickness of 4 mm, welded together back to back. On the East side there is a steel staircase made of 50х50х4 area with safety fence, made from steel strip -40х4. The lower part of the support diked soil with a height of 2.5 m. The tower has four stretch marks from the steel rope Ø12mm. The main causes of the accident was the deviation from a typical project in the manufacture of structural tower.

Keywords: tower, project, design,resistance, load

One of the most important strategic tasks, the solution of which is aimed at the development of the construction complex, is to improve the quality and competitiveness of construction products. In work the technique of an estimation of competitiveness of building production with the account of the criteria characterizing the basic properties and cost of considered objects is offered. The application of this methodology allows us to obtain not only reliable results of assessing the competitiveness of products, but also to determine the degree of improvement for each of the analyzed criteria after the corrective and preventive measures taken to improve the quality of products.

Keywords: quality, competitiveness, plastic window construction, profile system, weight ratio, integrated priority

The article deals with creep in structural mechanics. Systems of non-linear resolving equations for different types of creep kernels are written. An algorithm for solving the problem of nonlinear heredity is considered.

Keywords: creep, nonlinear heredity, creep kernel approximations, finite elements method, exponential-type kernels, least-squares method, collocation nodes

The article considers the modeling of negative frictional forces in the implementation of the subsidence properties of the foundation soil of the pile foundation. The calculation of various variants of design schemes for RSN has been performed. Based on the calculation results, the analysis of the stressed deformable state of the soil massif was made, the corresponding conclusions were drawn.

Keywords: negative friction forces, finite element method, pile foundation, soil massif, subsidence of soil

Discusses the current problems of calculations of reinforced concrete slabs. A full calculation of the reinforced concrete Foundation slab of a 17-storey residential building based on the finite element method using the estimated complex with the collection of loads in accordance with SP 20.13330.2011 "Loads and impacts". We study the dependence of the distribution of the zones of maximum precipitation of the plate from the shape of the building and the location of the loads. By results of calculations the analysis of obtained results and conclusions.

Keywords: the finite element method, the coefficients of the elastic Foundation, the maximum settlement of the building, SCAD 11.3, the coefficient of bed

This paper discusses features of development of design documents for new construction of motor roads. Lists the main stages of project development from inception of technical specifications for design work to delivery of documentation to the customer. The contents of the project documentation for car winter roads are indicated, with a description of each section. It is important to approach the development of project documentation with special care and responsibility, since sometimes even the slightest mistake can lead to serious consequences during the construction and operation of the facility. At each stage of documentation development, much time and effort is expended, current errors are identified, sections are rechecked, therefore, from preparation an technical design assignment to obtaining a positive expert opinion, it takes an average of 1.5-2 years. Correctly designed project guarantees the safety of people, when they are on the winter road.

Keywords: winter road, design, arrangement of territory, engineering surveys, technical design assignment, section of project documentation, the stages of project development, expertise

АнглийскийПеревести вGoogleBingThis article is devoted to the development of suhodolnyh pits in the permafrost zone. For the development of fields in the Arctic requires a large amount of sand for engineering training close to roads, well pads, sites for the installation of complex gas treatment, high pressure pump stations, the Central points of separation and other site projects. Development suhodolnyh quarries of sand in the Arctic requires further activities for the preparation of the sand to a condition suitable for construction. Range transport of sand from the quarry to the designed object will be considered acceptable when the object is within 20 km of the planned quarry, the transportation distance is more than 20 km puts an end to the possibility of further implementation of the project and directly affects the net present value of the project. Improvement of technology of development of dry sand in quarries can positively influence the Economics of the projectThis article is devoted to the development of suhodolnyh pits in the permafrost zone. For the development of fields in the Arctic requires a large amount of sand for engineering training close to roads, well pads, sites for the installation of complex gas treatment, high pressure pump stations, the Central points of separation and other site projects. Development suhodolnyh quarries of sand in the Arctic requires further activities for the preparation of the sand to a condition suitable for construction. Range transport of sand from the quarry to the designed object will be considered acceptable when the object is within 20 km of the planned quarry, the transportation distance is more than 20 km puts an end to the possibility of further implementation of the project and directly affects the net present value of the project. Improvement of technology of development of dry sand in quarries can positively influence the Economics of the project

Keywords: permafrost, perennial cryolithozone, quarries, sand, sand, career preparation to sand mining, development of oil and gas fields.production

The causes of death of people during a fire, as well as the effect of toxic combustion products on the human body are analyzed. It was found out that the main problem of unhindered evacuation of people from the building is blocking the evacuation routes by smoke. Methods of fighting smoke in a fire are considered and their advantages and disadvantages are determined. One of the ways to solve this problem is ultrasonic coagulation of aerosols with subsequent precipitation. Effective coagulation of smoke in a fire can be provided by a piezoelectric ultrasonic oscillatory system.

Keywords: fire, fire safety, multi-storey public building, toxic combustion products, smoke removal, smoke deposition, high intensity ultrasonic vibrations, ultrasonic radiation, acoustic radiator, piezoelectric ultrasonic oscillatory system

The article considers a method for optimizing circular ducts for ventilation and air conditioning systems. Universal dependencies are given to determine the diameters of the cross-sections of the air ducts and the air velocities in them that are technically and economically optimal. It is shown that the optimum air velocity in the section of the ventilation network does not depend on the site location relative to the fan of the system. Specific examples of determining the optimum diameters of air ducts and air velocities in them with the use of the dependences obtained are given in the technical and economic sense.

Keywords: Аir duct, aerodynamic calculation, ventilation system, air conditioning system, techno-economic optimization, optimal diameter, optimal air speed, energy saving, energy efficiency, aerodynamic efficiency

The article contains material reflecting the prospects of development of hydrothermal resources formation waters of the Azov-Kuban artesian basin.

Keywords: hydrothermal energy, groundwater, methane gas saturation

The use of higher aquatic plants (VVR) for water purification from various pollutants is an efficient system in wastewater technologies. For the development of bottom sediments of the river Temernik in Rostov-on-don it is proposed to use remotely operated underwater suction dredger, eliminates the secondary pollution of water. The project of the new landfill for disposal of bottom sediments is a waterproofing geomembrane Blackline TFS on the basis of high-pressure polyethylene and low-density LDPE. In the ""Target environmental program of improvement of the water basin of the river Temernik"", envisages clearing the riverbed with a length of 2 km, construction of disposal site sediments (PSDO), the establishment of biomodule with water hyacinth. During wastewater treatment water hyacinth decomposes and oxidizes industrial and organic sewage into simple elements and absorbs them as nutrition.Long massive root of water hyacinth absorbs heavy metals, oil products, phenols, synthetic surface-active substances (surfactants) and other substances.

Keywords: testing, toxicity, sediment, hyacinth, heavy metals, oil products, geomembrane, polyethylene, degelmintizatsiya

Repair of the bridge superstructures made to restore the performance of the facilities from damage incurred during operation. The main technical measures to improve the durability of structures buildings are reconstruction work on the prevention of water penetration from the roadway construction on the underlying design of superstructures and supports. Repair badly damaged sections of shelves extreme beams of the superstructure shall be mopping up indicators of acidity of not less than pH> 12 (concrete), followed by reduction of the dimensions of the concrete B30; F300 (in Spanish hlor.solyah.); W8 with pre-staging of additional rebar epoxy glue. Repair surface defects superstructures beams includes: To prepare and clean the defective concrete surfaces slabs beams superstructures sandblasting method, a chemical cleaning of the valve; Repair of surface defects of slabs beams non-shrink fast-hardening dry mix containing polymer fiber EMACO®90 and EMACO ®S88C; To restore the protective layer thickness of 20 to 40 mm is provided the use of a repair composition EMACO®S88S. For hydrophobic facades superstructures, attachments, etc. used water repellent water-based to protect concrete surfaces, which is designed for use on old and new concrete surfaces of bridges MASTERSEAL®303V.

Keywords: repair; concrete bridge; superstructures; fittings; waterproofing; anti-corrosion coating; MASTERSEAL; EMACO

Increasingly the non-autoclaved aerated concrete quality is created at of mortar mix expansion and the stage of plastic strength set. Consequently, the structure formation process can be deliberately controlled. The control actions choice is a complex scientific and technical challenge. It is solved in different ways in modern practice. The authors propose an integrated approach for selection of control actions in this article. In the first stage it is proposed to use expert methods, for example, the method of a priori ranking factors. It is rational to apply experimental study in the second stage. The article presents the choice of the control parameters vector in controlling the non-autoclaved aerated concrete structure formation as an example.

Keywords: non-autoclaved aerated concrete, production technological process, control, factor, quality, expert method, method of a priori ranking factors, experiment, integrated approach