Magazine of Civil Engineering, No.4(80), 2018


A.M. Sychova, L.B. Svatovskaya,  D.S. Starchukov, V.Y. Soloviova, M.V. Gravit 
The improving of the concrete quality in a monolithic clip

The article deals with the possibility of increasing strength, hardness, frost resistance, water and corrosion resistance of concrete. The reduction of its abrasion resistance and water absorption by creating a layer of nonorganic monolithic high-strength clip on its surface is also considered. The possibility of synthesis of such clip by impregnating the concrete surface with a Sol of SiO2 is shown and thermodynamically substantiated.
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A.I. Kirsanov, O.N. Stolyarov
Mechanical properties of synthetic fibers applied to concrete reinforcement

Short synthetic fibers are increasingly used for reinforcing of cement-based composites along with metallic and inorganic fibers. In this work, the mechanical properties of short polypropylene fibers with different structures were investigated. The main characteristics, including tensile strength, Young’s modulus, strain at maximum load, and work of rupture were determined.
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K.V. Kozhaeva
Influence of the compensating device parameters on the underwater pipeline stability

The definition of rational parameters of the developed compensating device of a triangular shape by calculation and experimental investigation methods is considered in the article. The proposed compensating device with the bent taps use has a more rigid design than the compensating device in the form of a broken bolt.
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Yu.B. Kalugin, A. Kaklauskas, Yu.N. Kazakov
Min-cut algorithm for network schedule by merging the vertices

The task of reducing the total duration of the project ("compression", "crashing") occurs when developing and adjusting schedules. The activities requiring crashing are determined by the minimum of added resources at the unit reduction of the schedule. The minimum cut in a critical network determines such activities. The essence of searching the minimum cut by merging vertices (edge tightening) of the critical network is presented.
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I.V. Atavin, B.E. Melnikov, A.S. Semenov, N.V. Chernysheva, E.L. Yakovleva
Influence of stiffness of node on stability and strength of thin-walled structure

The article is devoted to the evaluation of the torsional stiffness of the beam-pillar nodal connection of thin-walled rack structures. Results of in-place testing of several girder rack models are described, beam model and combined one are considered. Computational finite element (FE) models of these racks are designed to develop a FE analysis by software complex ANSYS.
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V.M. Tusnina, D.A. Emelianov
The seismic stability of facade system with facing by composite panels

The hinged ventilated facades installing is a perspective technology of buildings decoration. Suspended facade systems are widely used for construction and reconstruction of residential, administrative, public and industrial buildings. Using suspended facade systems for decorating exterior walls is helping designers to solve the problems of thermal protection and architectural and artistic expressiveness of buildings by using modern heat-insulating and decoration materials.
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V.I. Kolchunov, S.Yu. Savin
Survivability criteria for reinforced concrete frame at loss of stability

Analysis of scientific publications on the assessment of resistance of structures to progressive collapse, as well as existing and projects of design codes of different countries, in particular the project of Design Code "Protection of buildings and structures against progressive collapse. The design requirements. General conclusions", shows, that the main evaluating criteria are strength parameters.
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M. Garifullin, M.K. Bronzova, M. Heinisuo, K. Mela, S. Pajunen
Cold-formed RHS T joints with initial geometrical imperfections

This paper evaluates the effect of initial geometrical imperfections on the structural behavior of cold-formed rectangular hollow section T joints. Imperfections are simulated using the conventional approach for thin-walled structures, applying corresponding buckling modes to the perfect geometry.
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T.A. Belash, A.D. Yakovlev
Seismic stability of a tsunami-resistant residential buildings

We have analyzed data on the mechanism of tsunami waves formation and destruction caused by thereby, and also have summarized recommendations on tsunami-resistant construction. For reduction of damage and loss from strong earthquakes and high tsunami waves, hereon the solution for tsunami protection of the construction area is proposed in which small typical residential buildings are located in the upper part of the motor road trestle.
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D.D. Zaborova, K.I. Strelets, J. Bonivento Bruges, M.I. Asylgaraeva, M. de Andrade Romero, C. Steffan 
Engineering solutions for the social housing, integrated into urban environment

Deprived areas integrated into actively developing environment of the modern cities is a burning issue which is being studied in megalopolises of Latin America, Africa and Asia. Diverse controversial issues emerge in the interaction between the city community and inhabitants of the favela. The article deals with the solution for this issue based on the example of interaction between Brazilian favela “Sao Remo” and the University campus of Sao Paulo.
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E.A. Statsenko, A.F. Ostrovaia, V.Y. Olshevskiy, M.R. Petrichenko
Temperature and velocity conditions in vertical channel of ventilated facade

The most economically viable and practicable method of moisture removal from the air gap with the help of free convective air flows are presented in the article. An experiment conducted on a laboratory bench simulating a hinged ventilated facade is described.
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V.Y. Lushnikova, A.G. Tamrazyan
The effect of reinforcement corrosion on the adhesion between reinforcement and concrete

Due to aggressive environmental conditions, the adhesion between reinforcement and concrete deteriorates. This factor has a significant influence on the safety and efficiency of buildings and structures. The strength of adhesion between reinforcement and concrete decreases in the process of corrosion, and therefore requires a longer anchoring length of the reinforcement.
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A.Y. Ivanov, S.A. Chernogorskiy, M.P. Vlasov
Seismic design optimization considering base-isolation system

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.
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A.V. Denisov, A. Sprince 
Analytical determination of thermal expansion of rocks and concrete aggregates

The article provides selection and approbation of the model and the model-based method for the analytical determination of thermal expansion and rock fracturing (decompression) and concrete mineral aggregates according to the data about thermal deformations of minerals based on information of the mineral composition, the average grain fineness of minerals and the elasticity modulus of rock.
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V.V. Titkov, A.B. Bekbayev, T.M. Munsyzbai, K.B. Shakenov
Construction of autonomous buildings with wind power plants

The use of renewable energy converters, including local wind power plants to provide private households and houses with electricity, is gaining popularity, especially in countries where there are appropriate state subsidies. In this paper considered approach to the use of the building roof in the conversion of the kinetic energy of the incoming wind into electrical energy by a closed wind power plant (WPP).
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T.A. Hezhev, A.V. Zhurtov, A.S. Tsipinov, S.V. Klyuev
Fire resistant fibre reinforced vermiculite concrete with volcanic application

The results of studies on the development of vermiculite concrete composites with application of volcanic ash and pumice are presented. The composition of cement fibre vermiculite concrete fire resistant composites is offered, which allows reducing the consumption of Portland cement and simultaneously increasing their flame retardant properties.
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V.K. Sogomonyan, G.S. Chibukhchyan*, O.S. Chibukhchyan 
Diagnostics of fatigue fractures of building structures elements 

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.
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