233 Works

Vertical transport: resource by the criterion of safety

Nadezhda Sevryugina & Mikhail Stepanov
The issue of engineering systems safety in particular of vertical transportation is revealed. Inconsistency in the implementation of theoretical developments in practice is defined because of the probabilistic calculation of the parameters modeled by monotone-logical functions, when real systems are non-monotone functions. The duality of the results of the processes theoretical description is revealed. A typical algorithm of safety analysis is based on the deductive abilities of a researcher when drawing up a scenario of...

Structural seismic design optimization by economic criteria with consideration of base-isolation system

Andrei Ivanov, Sergey Chernogorskiy & Mark Vlasov
Structural seismic design optimization researches reviewing shows that existing economic effect assessment methods take into account only traditional seismic retrofit schemes excluding base-isolation system employment. The purpose of this study is to obtain economic optimization which allows to compare the economic effect E of base-isolated structure among with traditional seismic retrofit schemes. Here the approach is proposed of earthquake caused damage state "D" _"rel" computation in base-isolated structure considering repair works with due regard to...

Diagnostics of fatigue fractures of building structures elements

Oganes Chibukhchyan, Grigor Chibukhchyan & Vardan Sogomonyan
The article deals with the issues of increasing the fatigue strength of critical parts and components of construction machines and equipment, which are more often subjected to fatigue failure under the influence of variable complex loading. A quantitative estimate of the size of the fatigue fracture zones in the parts and joints installed in the building structures and power circuits of this construction equipment has been made. A new technique for technical diagnostics of the...

Biostable silicic rock-based glass ceramic foams

Vladimir Erofeev, Alexander Rodin, Aleksej Kravchuk, Sergej Kaznacheev & Elena Zaharova
The search for the possibility of expanding the resource base through the use of local rocks, as well as reducing the cost of final product, is one of the scientific research areas in the field of obtaining foam glass-based building materials. The aim of the research is the development of compositions and recommendations for the production of silicic rock-based glass ceramic foams. These studies will allow to create strong and durable building materials with low...

Heating and charring of timber constructions with thin-layer fire protection

Evgeniy Polishchuk, Andrey Sivenkov & Samat Kenzhehan
The results of fire tests of constructions (beams) with fire retardant film coating in one-side fire effect under standard temperature fire regime are shown in this article. Intensity dynamics of samples heating and their charring process in thickness and along the perimeter were chosen as the key indicators. It is shown that the use of thin-layer non-swelling fire retardant coatings does not influence the intensity dynamics, in case of high-temperature exposure generates from the side...

Computational modelling of random distribution of stresses for wooden structures

Iosif Rasha, Olga Pertseva, Alena Lazareva & Gleb Martynov
Stochastic allocation is the main characteristic of processes which can be described in wooden structures. Random distribution of stresses and deformations in such structures is mostly based on timber imperfections, such as different curvature of sticks, presence of knots, twigs and gnarls. Due to restoration works using of test methods and experiments in wooden structures, especially in architectural monuments, is limited because of high labor contribution and restrictions for protection of historic cultural heritage. Therefore,...

Техническое нормирование рабочих процессов в строительстве на основе пространственно-временного моделирования

Tatyana Bobrova & Pavel Panchenko
Application of spatial-time modeling to the rate setting of operational sequence is a practical way to reduce the labor required for this work without losing any accuracy and authenticity of the results was analyzed. The methodology provided the analytical algorithm of rate calculation in MS Excel is synchronized with the visualization of operational sequence in Cinema 4D. The sequence of visualization of rate setting is considered with the example of a common operational sequence for...

Thermal cracking resistance in massive foundation slabs in the building period

Aleksandra Bushmanova, Yuriy Barabanshchikov, Kirill Semenov, Ayyyna Struchkova & Sergey Manovitsky
The article deals with the research of the thermal cracking resistance of massive concrete and reinforced foundation slabs of buildings and structures in the building period. The article examines the results of the analysis of the thermal stress state of a massive foundation slab with a fixed thickness of thermal insulation as well as the results of changing the minimum thickness of the insulation on a surface, providing the cracking resistance of the structures on...

Numerical modelling of tides and tsunami waves propagation

Vitaly Klimovich, Oleg Voronkov, Vyacheslav Davidenko & Sergey Ivanov
Modelling of tides and tsunami waves propagation is important problem for the hydraulic engineering practice since it allows to predict characteristics of these phenomena (load, values of run up and flooding zones, propagation times to structures and so on) and to make reasonable choice of design solution for coastal structures. Numerical modeling is effective way to simulate tides and tsunami waves propagation. Results of simulations of tides and tsunami waves propagation on the basis of...

Aerodynamics of building structures for flue gas removal

Vadim Akhmetov, Viktor Shkadov & Pavel Konon
Natural fuel burning in modern heat power plants with flue gas formation is accompanied with harmful environmental impact and potential opportunity of acid fallout. This can lead to local or even global catastrophe under adverse circumstances. High-rise structures combining a smokestack and a cooling tower are used for ecological natural fuel burning. The most important problem of these structures design is to study gas-dynamic behavior of flue gas mixing with warm ambient air flow during...

Track-etched membranes back-flushing and regeneration during the natural water purification

Polina Barashkova & Ludmila Molodkina
Membrane filtration is one of the main methods of local water treatment. Track-etched membranes allow to obtain high-quality purified water due to their high selectivity. During the filtration, the productivity of process can decreases due to the adsorption of components in the pores, pore blockages, formation of sediment layer above the membrane. To restore the productivity, the membrane should be flushed periodically or regenerated chemically. Comparative study of the back-flushing and chemical regeneration after natural...

Modeling the design seismic input in conditions of limiting seismological information

Tatiana Ivanova, Jhy Guan, Olga Nesterova, Sergey Prokopovich, Lybov Smirnova, Aleksandr Uzdin & Dmitry Ivashintzov
The object of the investigations is seismic input models used in structure designing under the conditions of limited seismological information. The aim of the given investigation is to propose a new variant of a seismic input model, which should be generated for the structure under consideration, taking into account main peculiarities of actual seismic excitations. The method of design seismic input generation by means of its presentation as a sum of velocity impulse and multi...

Adhesive dry mix using an amorphous aluminosilicates

Kristina Zhegera, Irina Pyshkina & Georgiy Martyashin
In the paper, it is proposed to use synthesized amorphous aluminosilicates as a modifying supplement in cement adhesive dry mixes. The results of the analysis of the chemical composition and microstructure of the developed supplement based on amorphous aluminosilicates used as a modifying supplement in the recipe of adhesive dry mixes are given. A method for evaluating the shear strength of a solution layer using the device GT 2.2.3 is proposed. The methods of testing...

Thermal-insulation boards from fibrous plant wastes and urea-formaldehyde binder

Tatiana Vahnina, Irina Susoeva & Andrey Titunin
Irreversible waste spinning flax and cotton are sent to landfill or incinerated, it adversely affects the environment, although it is desirable to use plant waste for production, which would be a very positive approach in terms of natural environment. Composite boards of irrecoverable waste from the processing of flax and cotton and urea-formaldehyde binder (UF) can be used as a thermal-insulation material, the development of this composite material is the purpose of this research. The...

Strength of reinforced concrete beams of high-performance concrete and fiber reinforced concrete

Vladimir Travush, Denis Konin & Alexey Krylov
The strength of reinforced concrete beams made of high-performance concrete and fiber reinforced concrete was evaluated in a pure-bending test. The efficiency of using straight steel fiber in bending structures was evaluated. The fracture pattern of models was described. The results of measuring the vertical displacement and crack width are provided and compared to the rated values. The diagrams of stresses and deformation in reinforcement and concrete of models are presented, and their specific features...

Models of direct anchoring of reinforcement in concrete

Larisa Krasotina, Jose Luis Pulido-Delgado & Yurii Krasnoshchekov
When analyzing methods for calculating the anchoring of non-tension reinforcement of reinforced concrete structures, it has been established that there are two types of destruction of concrete in the anchoring zone by shearing or cracking. They are based on the results of research of the strength the adhesion of reinforcement with concrete and testing of specimens with the same type. A new model of anchoring has been created. This model initial moment is the equality...

Rheological behavior of 3D printable cement paste: criterial evaluation

Galina Slavcheva & Olga Artamonova
The extrudability and firm stability are the criterial rheological characteristics of building 3D printable mixtures. From the point of view of classical rheology of disperse systems, the theoretical analysis of the rheological behavior of a cement paste has been analyzed for all stages of 3D printing process. Apparently both the theoretical analysis criteria and technological tools to control rheological behavior of a 3D printable mixture have been justified. The squeezing test is used in the...

Evolutionary optimization of prestressed steel frames

Anatoly Alekseytsev & Sergey Akhremenko
A method for the optimal synthesis of prestressed steel frame structures is developed. The search for a solution is being carried out by applying discrete sets of variable parameters, including cross-sections of structural rods and cross-sections of prestressing tie-rods. It is possible to vary the location of the prestressing system. To optimize the cost of the objects under consideration, an improved meth-od of evolutionary simulation has been used, including a combined scheme for constraints set...

Improvement of the soil deformation modulus using an expandable polyurethane resin

MOHANAD SABRI & Constantin Shashkin
Different methods are used in the field for foundations remediation and improvement of the soil properties, but every method has its advantages and limitations. Moreover, not all the existing methods are able to stabilize the soil and elevate the foundations effectively, regulating the process depending on the desired results. The settlements of the foundations of the buildings and structures lead to negative consequences and controlling the settlements is complex itself essentially in the type of...

Structurization processes of cement composites modified with electrolytic additives

Tatiana Shepelenko, Nicholas Gorlenko & Olga Zubkova
There has been research on the impact of AlCl3 and FeCl3 solutions on kinetics of cement hardening. The research was carried out in two comparative versions, one of which had the saline solutions introduced into cement as gauge liquid (“water–1% electrolytic solution”), the other had them as additives, synthesized in suspensions “cement – (water–1% electrolytic solution)”. It has been stated that the use of AlCl3 and FeCl3 solutions as gauge liquids leads to reduction of...

Indoor environment of a building under the conditions of tropical climate

Jose Castro, Daria Zaborova, Tatiana Musorina & Ivan Arkhipov
This paper is focused on having a different approach to energy efficiency and the way it is employed in industry. It considers the real case of Latin-America where normal temperature during day drastically changes from 0 to 25 degrees. Such temperature variation affects the indoor climate and its comfort. Therefore, one of the important tasks in construction of such regions is the correct choice of building materials for the enclosing structures. This article studies the...

Alkali-activated slag binders from rock-wool production wastes

Vladimir Erofeev, Alexander Rodin, Vladislav Yakunin, Andrej Bogatov, Viktor Bochkin & Aleksej Chegodajkin
The article exposes the results of studies on the production of alkali-activated slag binders from rock-wool production wastes and their composite derivatives, which are resistant to corrosive effects of biological environment. Thermal analysis showed that the structurization in the "rock wool production waste-water-NaOH" system is most efficient with the NaOH/waste ratio of 0.02–0.03, and the main newly-formed phases in the solidified alkali-activated slag composites are low-basic calcium hydrosilicates and analcime. The best values of the...

Flow states in the classical Venturi channel water gauge

Andrey Zuikov, Viktorija Bakunjaeva, Tatiana Artemyeva & Elena Zhazha
The paper relates to the field of hydraulics and is devoted to the study of fluid flow states in a non-submerged Venturi channel. The aim is improvement of the method of hydraulic calculation of the classical Venturi channel. Authors applied experimental methods with the use of hi-tech certified measurement equipment allowing for digital technology-based automated collection and processing of empirical information; calculation and analytical methods. Distribution of depths, velocities and Froude numbers in flow direction...

Mathematical modeling of the colmatation of concrete pores during corrosion

Sergey Fedosov, Varvara Rumyantseva, Igor Krasilnikov, Viktoriya Konovalova & Artem Evsyakov
Pore colmatation plays a positive role, since the decrease in the permeability of cement concrete due to the deposition of insoluble corrosion products in the pores leads to a slowdown in corrosion processes. The mathematical model of concrete pore colmatation based on the mass transfer equations is given, which allows to estimate the depth of corrosion damage of concretes in media of various degrees of aggressiveness. The presented model describes the rate of advance of...

Payback period of investments in energy saving

Alexander Gorshkov, Nicolai Vatin, Pavel Rymkevich & Olga Kydrevich
Authors developed a mathematical model for estimating the discounted payback period of investments for reducing energy resources needed in building's development. Obtained equations allow calculating the projected payback period for investments in energy saving, taking into account the size of the investment, the estimated or actual value of the achieved energy saving effect, the dynamics of energy carriers tariff growth, the discounting of future cash flows, and also a value and a period of loan...

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