Pile-foundation system shock loading in an axisymmetric approach

Vestnik MGSU 8/2015
  • Vasenkova Ekaterina Viktorovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Senior Lecturer, Department of Higher Mathematics, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zuev Vladimir Vasil’evich - Moscow State Institute of Radio Engineering, Electronics and Automation (MIREA Doctor of Physical and Mathematical Sciences, Professor, chair, Department of Applied Mathematics and Informatics, Moscow State Institute of Radio Engineering, Electronics and Automation (MIREA, 20 Stromynka str., Moscow, 107996, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 101-108

The basic problem of structural mechanics, namely the problem of pile shock loading sunk in a foundation, has been examined in an axisymmetric approach within defining relations for irreversible deformations offered earlier in the space of deformations. As a model of the theory of plasticity, the Mises model generalized by the authors has been accepted, the use of which solves a nonstationary system of nine two-dimensional equations with various entry and boundary conditions. Enlightened attitudes use approximate engineering approaches which allow estimating the behavior of a pile-foundation system. A solution is constructed mainly with the use of the theory of linear-elastic continuum. However they do not enable to consider various peculiarities of deformation behavior of soils and pile materials and to give an appropriate detailed picture of a system mode of deformation. Mechanical peculiarities of the behavior of foundation and pile materials discovered recently demand more enlightened attitudes to analyze a mode of deformation in a pile-foundation system considering both plasticity and fracture. The offered approach enables to give a complete picture of a mode of deformation in a pile-foundation system at any time and a picture of occurrence and development of plasticity and fracture zones.

DOI: 10.22227/1997-0935.2015.8.101-108

References
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INTERACTION OF A LONG SINGLE PILE THAT HAS A DOUBLE-LAYER BASE WITH ACCOUNT FOR COMPRESSIBILITY OF THE PILE SHAFT

Vestnik MGSU 4/2012
  • Ter-Martirosyan Zaven Grigor'evich - Moscow State University of Civil Engineering (MSUCE) , Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Trinh Tuan Viet - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Department of Mechanics of Soils, Ground Foundation and Foundation Mechanics, Moscow State University of Civil Engineering (MSUCE), 26, Yaroslavskoe Shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 28 - 34

WITH ACCOUNT FOR COMPRESSIBILITY OF THE PILE SHAFT
The authors provide their solution to the problem of interaction of a long compressible pile that has a double-layer linear deformable base. The paper demonstrates that taking account of compressible properties of the pile material leads to qualitatively new distribution of shearing stresses over the surface of a cylindrical pile. It is noteworthy that increase of the pile length and stiffness of the upper section of the base raise the share of the load perceived by the surface of the pile. Besides, in particular conditions of the soil environment, the load perceived by the lower section of the base may reach approximately 20-30 % of the total load.

DOI: 10.22227/1997-0935.2012.4.28 - 34

References
  1. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p.
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  3. Ukhov S.B., Semenov V.V., Znamenskiy V.V., Ter-Martirosyan Z.G., Chernyshev S.N. Mekhanika gruntov, osnovaniya i fundamenty [Soil Mechanics, Bases and Foundations]. Moscow, ASV Publ., 2004, 566 p.
  4. Ter-Martirosyan Z.G., Trinh Tuan Viet. Vzaimodeystvie odinochnoy dlinoy svai s osnovaniem s uchetom szhimaemosti stvola svai [Interaction between a Single Long Pile and the Bedding with Account for Compressibility of the Pile Shaft]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 8, pp. 104—111.
  5. Nguyen Giang Nam. Identification of the Settlement of the Round Die with Allowance of Its Embedding. Collected papers of the 4th International Scientific Conference of Young Scientists, Postgraduates, and Doctoral Students. Construction as Formation of the Living Environment. Moscow, MSUCE, 2006.

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Features of propagation and recordingof the stress waves in plates of finite thickness

Vestnik MGSU 2/2014
  • Cherednichenko Rostislav Andreevich - Moscow State University of Civil Engineering (MGSU) Candidate of Physical and Mathematical Sciences, Associate Professor, Department of Higher Mathematics, Moscow State University of Civil Engineering (MGSU), ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 65-73

This work was carried out to study at the same time the dynamics of wave propagation in plane and axisymmetric plates by finite-difference numerical calculation and by the method of dynamic photoelasticity.In many cases it is possible to carry out the investigation of the dynamic stressed state of solid structures under the impact of seismic waves in plane statement, observing the foundation and the building itself in the conditions of plane deformation. Such problems in structural mechanics are usually investigated on plates providing the conditions of generalized plane stressed condition and accounting for the necessity of the known substitution of elastic constants. In case of applying the model of generalized plane stressed state for investigating two-dimensional waves’ propagation in three-dimensional elastic medium it may be necessary to observe certain additional conditions, which for example limit the class of external impacts of high frequencies (short waves). The use of candling for wave recording in plane models explored with the method of dynamic photoelasticity in the observed cases of impulse loading of the plates with finite thickness gives satisfactory results.

DOI: 10.22227/1997-0935.2014.2.65-73

References
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Prevention of brittle fracture of steel structures by controlling the local stress and strain fields

Vestnik MGSU 2/2015
  • Moyseychik Evgeniy Alekseevich - Novosibirsk State Universityof Architecture and Civil Engineering (NSUACE (Sibstrin)) Candidate of Technical Sciences, Associate Professor, Doctoral Student, Department of Metal and Wooden Structures, Novosibirsk State Universityof Architecture and Civil Engineering (NSUACE (Sibstrin)), 113 Leningradskaya str., Novosibirsk, 630008, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 45-59

In the article the author offers a classification of the methods to increase the cold resistance of steel structural shapes with a focus on the regulation of local fields of internal stresses and strains to prevent brittle fracture of steel structures. The need of a computer thermography is highlighted not only for visualization of temperature fields on the surface, but also to control the fields of residual stresses and strains in a controlled element.

DOI: 10.22227/1997-0935.2015.2.45-59

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  17. Kopel’man L.A. Vliyanie ostatochnykh napryazheniy na sklonnost’ svarnykh elementov k khrupkim razrusheniyam [Influence of Residual Stresses on the Tendency of Welded Elements to Brittle Fracture]. Svarochnoe proizvodstvo [Welding Production]. 1963, no. 4, pp. 9—18. (In Russian)
  18. Kudryavtsev P.I. Ostatochnye svarochnye napryazheniya i prochnost’ soedineniy [Residual Welding Stresses and Strength of Joints]. Moscow, Mashinostroenie Publ., 1964, 96 p. (In Russian)
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  21. Golodnov A.I. Regulirovanie ostatochnykh napryazheniy v svarnykh dvutavrovykh kolonnakh i balkakh [Regulation of Residual Stresses in Welded I-beam Columns and Beams]. Kiev, Stal’ Publ., 2008, 150 p. (In Russian)
  22. Alpsten G.A., Tall D.L. Residual Stresses in Heavy Welded Shapes. Geometry of Plates and Shapes is an Important Variable Affecting Residual Stress Magnitude and Distribution, and Initial Residual Stresses Due to Rolling Can be a Higher Magnitude Than Those Due to Welding. Welding Research Supplement. March, 1970, pp. 93—105.
  23. Siddique M., Abid M., Junejo H.F., Mufti R.A. 3-D Finite Element Simulation of Welding Residual Stresses in Pipe-Flange Joints: Effect of Welding Parameters. Materials Science Forum. 2005, vol. 490—491, pp. 79—84. DOI: http://dx.doi.org/10.4028/www.scientific.net/MSF.490-491.79.
  24. Wilson W.M., Chao Chien Hao. Residual Stresses in Welded Structures. University of Illinois Bulletin. February 2. 1946, vol. 43, no. 40, 80 p.
  25. DeLong D.T., Bowman M.D. Fatigue Strength of Steel Bridge Members with Intersecting Welds. Final Report FHWA/IN/JTRP-2009/19. Design 7/10 JTRP-2009/19 INDOT Division of Research West Lafayette, IN 47906 // Indianapolis, July 2010, 204 p.
  26. Rykovskiy B.P., Smirnov V.A., Shcheti-nin G.M. Mestnoe uprochnenie detaley poverkhnostnym naklepom [Local Hardening Of Details By Surface Hardening]. Moscow, Mashinostroenie Publ., 1985, 152 p. (In Russian)
  27. Vinokurov V.A. Otpusk svarnykh konstruktsii dlya snizheniya napryazheniy [Draw of Welded Structures to Reduce Stresses]. Moscow, Mashinostroenie Publ., 1973, 215 p. (In Russian)
  28. Alyavdin P.V. Predel’nyy analiz konstruktsiy pri povtornykh nagruzheniyakh [Limit Analysis of Structures under Repeated Loading]. Minsk, UP «Tekhnoprint» Publ., 2005, 284 p. (In Russian)
  29. Ivanov A.M., Lukin E.S., Larionov V.N. K issledovaniyu kinetiki uprugoplasticheskogo deformirovaniya i razrusheniya elementov konstruktsiy s kontsentratorami napryazheniy po teplovomu izlucheniyu [On the Kinetics Study of Elastic-Plastic Deformation and Fracture of Structural Elements with Stress Concentrators on Thermal Radiation]. Doklady Akademii nauk [Reports of the Russian Academy of Sciences]. 2004, vol. 395, no. 5, pp. 609—613. (In Russian)
  30. Yakushev A.I., Mustaev R.Kh., Mavlyu-tov R.R. Povyshenie prochnosti i nadezhnosti rez’bovykh soedineniy [Increasing the Strength and Reliability of Threaded Connections]. Moscow, Mashinostroenie Publ., 1979, 215 p. (In Russian)
  31. Ivanov A.M., Lukin E.S. Kombinirovanie metodov obrabotki — effektivnyy sposob upravleniya udarnoy vyazkost’yu staley [Combining the Treatment Methods — An Effective Way to Control the Toughness of Steel]. Izvestiya Samarskogo nauchnogo tsentra RAN [Proceedings of the Samara Scientific Center of the Russian Academy of Sciences]. 2012, vol. 14, no. 4 (5), pp. 1239—1242. (In Russian)

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Identification of pre-operation stresses and deformation of steel beams-ribsof composite floors

Vestnik MGSU 7/2013
  • Zamaliev Farit Sakhapovich - Kazan State University of Architecture and Civil Engineering (KazGASU) Candidate of Technical Sciences, Associate Professor, Department of Metal Constructions and Testing of Structures; +7 (843) 510-47-09., Kazan State University of Architecture and Civil Engineering (KazGASU), 1 Zelenaya St., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 33-39

Steel rib-reinforced beams are frequently used in the reconstruction of architectural monuments as a replacement for timber slabs. Insufficient amount of information about the stress-strain state of composite steel and concrete slabs limits their use in the domestic construction practice. The author describes the composition and geometric parameters of the structural solution. The author provides illustrations representing the reinforcement slab and anchors needed to track the behavior of composite concrete floors, the photographs featuring the voltage sensors attached to the shelves and the wall of a steel beam, the instrument used to measure the relative strain in the bottom of the beam. The technique employed by the author is used to track the dynamics of strains in the fiber discs, steel beams, and development of deflections. The author also describes the nature of stress on the top of the beam section. The experimental research has confirmed the assumption that the concrete setting time influences the stress-strain state of the steel beams as the basic elements of composite load-bearing floors. The author also provides the findings of the pilot studies.

DOI: 10.22227/1997-0935.2013.7.33-39

References
  1. Streletskiy N.N. Stalezhelezobetonnye proletnye stroeniya mostov [Composite Steel and Reinforced Concrete Span Structures of Bridges]. Moscow, Transport Publ., 1981, 360 p.
  2. Gibshman E.E. Teoriya i raschet predvaritel’no napryazhennykh zhelezobetonnykh mostov s uchetom dlitel’nykh deformatsiy [Theory and Analysis of Pre-stressed Reinforced Concrete Bridges with Account for Long-term Deformations]. Moscow, Transport Publ., 1966., 366 ð.
  3. Golyshev A.B., Polishchuk V.P., Kolpakov Yu.A. Raschet sborno-monolitnykh konstruktsiy s uchetom faktora vremeni [Analysis of Prefab Monolithic Structures with Account for the Time Factor]. Kiev, Budivilnik Publ., 1969, 220 p.
  4. Sattler K. Composite Construction in Theory and Practice. The Structural Engineer, 1961, vol. 39, no. 4, p. 163.
  5. Bresler, Boris. Reinforced Concrete Engineering. Materials, Structural Elements, Safety. Vol. 1, Tohu Wiley and Sons, pp. 236—241.
  6. Perekrytiya stalezhelezobetonnye s monolitnoy plitoy STO 0047 [Reinforced Concrete Floor with a Monolithic Slab. Standards of Organizations 0047]. Moscow, TsNIIPSK, 2005, 43 p.
  7. EN 1992-1-1: Eurocode 2: Design of Concrete Structures — Part 1.1. General Rules and Rules for Buildings. CEN, 2007, 224 p.
  8. Almazov V.O. Problemy ispol’zovaniya Åvrokodov v Rossii [Problems of Application of the Eurocodes in Russia]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2012, no. 7, pp. 36—38.
  9. Mirsayapov I.T., Zamaliev F.S., Shaymardanov R.I. Otsenka prochnosti normal’nykh secheniy stalezhelezobetonnykh izgibaemykh elementov pri odnokratnom staticheskom nagruzhenii [Assessment of Strength of Regular Sections of Composite Steel and Reinforced Concrete Elements in Bending If Exposed to Single-time Static Loading]. Sbornik statey RAASN [Collected Works of the Russian Academy of Architecture and Civil Engineering]. Nizhny Novgorod, NGASU Publ., 2001, pp. 247—250.
  10. Zamaliev F.S., Mirsayapov I.T. Raschet prochnosti stalezhelezobetonnykh izgibaemykh konstruktsiy na osnove analiticheskikh diagram [Strength Analysis of Composite Steel and Reinforced Concrete Structures in Bending on the Basis of Analytical Diagrams]. Razrabotka i issledovanie metallicheskikh i derevyannykh konstruktsiy. Sbornik nauchnykh trudov [Development of and Research into Metal and Timber Structures. Collection of Research Papers]. Kazan, KGASA Publ., 1999, pp. 142—149.

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Featuresof the stress-and-strain state of outer walls under the influence of variable temperatures

Vestnik MGSU 10/2013
  • Kremnev Vasiliy Anatol'evich - LLC "InformAviaKoM" Director General, LLC "InformAviaKoM", 2 Pionerskaya str., Korolev, Moscow Region, 141074, Russian Federation; +7 (495) 645-20-62; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kuznetsov Vitaliy Sergeevich - Mytishchi Branch, Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; +7 (495) 583-07-65; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Talyzova Yuliya Aleksandrovna - Moscow State University of Civil Engineering (MGSU) Assistant, Department of Architectural and Structural Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 52-59

The authors draw attention to possible problems in the process of construction and operation of monolithic frame buildings, construction of which is now widespread. It is known that cracks can often appear in the facade and side walls. The size of the cracks can exceed the allowable limits and repair does not lead to their complete elimination. Also cracks significantly mar the appearance of a building. Thus, the relevance of this study lies not only in fuller understanding of the operation of walls, but also in the ability to prevent undesirable effects.The authors calculated temperature effects for boundary walls of the building blocks made of heavy concrete. The original dimensions of the walls conformed to a grid of columns for the majority of residential and public buildings.The stress-and-strain state of the walls in case of temperature changes is observed in detail, including the transition from sub-zero to above-zero temperatures within the same section (wall). It was revealed that the temperature variations within the established limits may cause stress-and-strain state in the walls, in which the temperature tensile stresses can exceed the tensile strength of materials. The article contains effective means of reducing thermal strains, which can prevent temperature and shrinkage cracking.

DOI: 10.22227/1997-0935.2013.10.52-59

References
  1. Krivoshein A.D., Fedorov S.V. K voprosu o raschete privedennogo soprotivleniya teploperedache ograzhdayushchikh konstruktsiy [On the Problem of Calculating the Reduced Thermal Resistance of Building Envelopes]. Inzhenerno-stroitel'nyy zhurnal [Magazine of Civil Engineering]. 2010, no. 8. Available at: http://www.engstroy.spb.ru Date of access: 5.12.12.
  2. Derkach V.N., Orlovich R.B. Voprosy kachestva i dolgovechnosti oblitsovki sloistykh kamennykh sten [Issues of Quality and Durability of the Lining of Layered Stone Walls]. Inzhenerno-stroitel'nyy zhurnal [Magazine of Civil Engineering]. 2011, no. 2. Available at: http://www.engstroy.spb.ru Date of access: 5.12.12.
  3. Soon-Ching Ng, Kaw-Sai Low, Ngee-Heng Tioh. Newspaper Sandwiched Aerated Lightweight Concrete Wall Panels — Thermal inertia, transient thermal behavior and surface temperature prediction. Energy and Buildings. 2011, vol. 43, no. 7, pp. 1636—1645.
  4. Sami A. Al-Sanea, Zedan M.F. Effect of Thermal Bridges on Transmission Loads and Thermal Resistance of Building Walls under Dynamic Conditions. Applied Energy. 2012, vol. 98, pp. 584—593.
  5. Chengbin Zhang, Yongping Chen, Liangyu Wu, Mingheng Shi. Thermal Response of Brick Wall Filled with Phase Change Materials (PCM) under Fluctuating Outdoor Temperatures. Energy and Buildings. 2011. vol. 43, no. 12, pp. 3514—3520.
  6. Pinsker V.A., Vylegzhanin V.P. Teplofizicheskie ispytaniya fragmenta kladki steny iz gazobetonnykh blokov marki po plotnosti D400 [Thermophysical Test of a Segment of Masonry Walls Made of Aerated Concrete Blocks Mark with the Density D400]. Inzhenernostroitel'nyy zhurnal [Magazine of Civil Engineering]. 2009, no. 8. Available at: http://www.engstroy.spb.ru Date of access: 10.07.13.
  7. Knat'ko M.V., Gorshkov A.S., Rymkevich P.P. Laboratornye i naturnye issledovaniya dolgovechnosti (ekspluatatsionnogo sroka sluzhby) stenovoy konstruktsii iz avtoklavnogo gazobetona s oblitsovochnym sloem iz silikatnogo kirpicha [Laboratory and Field Studies of Durability (Operating Life) of a Wall Structure Made of Autoclave Aerated Concrete with Facing Layer made of Sand-lime Brick]. Inzhenerno-stroitel'nyy zhurnal [Magazine of Civil Engineering]. 2009, no. 8. Available at: http://www.engstroy.spb.ru Date of access: 10.07.13.
  8. Ogorodnik V.M., Ogorodnik Yu.V. Nekotorye problemy obsledovaniya zdaniy s otdelkoy litsevym kirpichom v Sankt-Peterburge [Some Problems of the Inspection of Buildings having Face Brick Finishing in St. Petersburg]. Inzhenerno-stroitel'nyy zhurnal [Magazine of Civil Engineering]. 2010, no. 7. Available at: http://www.engstroy.spb.ru Date of access: 7.02.12.
  9. Snegirev A.I., Al'khimenko A.I. Vliyanie temperatury zamykaniya pri vozvedenii na napryazheniya v nesushchikh konstruktsiyakh [The Influence of Circuit Temperature on the Stresses in the Process of Construction of Load-bearing Structures]. Inzhenerno-stroitel'nyy zhurnal [Magazine of Civil Engineering]. 2008, no. 2. Available at: http://www.engstroy.spb.ru Date of access: 7.02.12.
  10. Karpilovskiy V.S. SCADOFFICE. Vychislitel'nyy kompleks Scad [SCADOFFICE. Computing System Scad]. Moscow, 2011, pp. 274—283.

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NUMERICAL AND EXPERIMENTAL STUDIES OF MONOLITHIC CHARACTER OF THICK-WALLED ANISOTROPIC SHELL

Vestnik MGSU 7/2016
  • Memarianfard Mahsa - K.N. Toosi University of Technology Associate Professor, Department of Engineering Ecology, K.N. Toosi University of Technology, 470 Mirdamad Ave. West, 19697, Tehran, Iran; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Turusov Robert Alekseevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Physical and Mathematical Sciences, Professor, Department of Strength of Materials, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Memarianfard Memaryanfard - Moscow State University of Civil Engineering (National Research University) (MGSU) postgraduate student, Department of Strength of Materials, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 36-45

This paper presents t experimental and numerical studies of cracking in the thick-walled filament-wound cylindrical shells made of fiber reinforced plastic during the manufacturing process (specifically, in the process of curing and cooling). The experiments have shown that, when the cylinder is cooled by optimum cooling regime, at the end of the cooling process the obtained cylinder is monolithic and without ring cracking. In this regard, the residual thermal stresses in thick-walled cylinder in the cooling process is calculated using finite element method with account for transient heat conduction and the temperature dependence of the mechanical properties of the material and the viscoelastic behavior of the polymer. The calculations are conducted for cooling in standard and optimum regimes. The results showed that the maximum radial stress in the most dangerous initial area is several times less when the cylinder is cooled down in the optimum regime than when it is cooled in the standard regime.

DOI: 10.22227/1997-0935.2016.7.36-45

References
  1. Ekel’chik V.S., Klyunin O.S. Novyy podkhod k sozdaniyu oblegchennykh metallo-plastikovykh ballonov vysokogo davleniya dlya szhatykh gazov [New Approach to the Creation of Lightweight Reinforced-Plastic High Pressure Cylinders for Compressed Gases]. Voprosy materialovedeniya [Problems of Materials Science]. 2003, no. 2 (34), pp. 26—31. (In Russian)
  2. Turusov R.A., Memaryanfard H. Diskretnaya model’ v analize ostatochnykh napryazheniy odnonapravlennykh namotochnykh tsilindrov iz armirovannogo plastika v protsesse okhlazhdeniya [Discrete Model in the Analysis of Residual Stresses in Unidirectional Winding Cylinders Made of Fiber-Reinforced Plastic]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2015, no. 1, pp. 27—35. (In Russian)
  3. Turusov R.A., Korotkov V.N., Rogozinskiy A.K., Kuperman A.M., Sulyaeva Z.P. Tekhnologicheskaya monolitnost’ obolochek iz polimernykh kompozitnykh materialov [Monolithic Technology of the Shells of Polymer Composite Materials]. Mekhanika kompozitnykh materialov [Mechanics of Composite Materials]. 1987, no. 6, pp. 1072—1076. (In Russian)
  4. Turusov R.A., Korotkov V.N., Rogozinskiy A.K. Temperaturnye napryazheniya v tsilindre iz kompozitnogo materiala v protsesse ego okhlazhdeniya i khraneniya [Thermal Stresses in a Cylinder Made of a Composite Material in the Process of Cooling and Storage]. Mekhanika kompozitnykh materialov [Mechanics of Composite Materials]. 1983, no. 2, pp. 290—295. (In Russian)
  5. Korotkov V.N., Dubovitskiy A.Ya., Turusov R.A., Rozenberg B.A. Teoriya optimizatsii rezhima okhlazhdeniya tolstostennykh izdeliy iz kompozitnykh materialov [Optimization Theory of Cooling Regime of Thick-Walled Products Made of Composite Materials]. Mekhanika kompozitnykh materialov [Mechanics of Composite Materials]. 1982, no. 6, pp. 1051—1055. (In Russian)
  6. Bolotin V.V., Blagonadezhin V.L., Varushkin E.M., Perevozchikov V.G. Ostatochnye napryazheniya v namotochnykh elementakh konstruktsiy iz armirovannykh plastikov [Residual Stresses in Winding Elements of Constructions Made of Reinforced Plastics]. Moscow, Izdatel’stvo TsNII informatsii Publ., 1977. (In Russian)
  7. Bolotin V.V., Vorontsov A.N. Formation of Residual Stresses in Components Made out of Laminated and Fibrous Composites during the Hardening Process. Mechanics of Composites. September 1976, vol. 12, no. 5, pp. 701—705. DOI: http://dx.doi.org/10.1007/BF00856324.
  8. Afanas’ev Yu.A., Ekel’chik B.C., Kostritskiy S.N. Temperaturnye napryazheniya v tolstostennykh ortotropnykh tsilindrakh iz armirovannykh polimernykh materialov pri neodnorodnom okhlazhdenii [Temperature Stresses in Thick-Walled Orthotropic Cylinders Made of Reinforced Polymer Materials in Case of Inhomogeneous Cooling]. Mekhanika kompozitnykh materialov [Mechanics of Composite Materials]. 1980, no. 4, pp. 651—660. (In Russian)
  9. Hyer M.W., Rousseau C.Q. Thermally-Induced Stresses and Deformations in Angle-Ply Composite Tubes. Journal of Composite Materials. 1987, vol. 21, no. 5, pp. 454—480. DOI: http://dx.doi.org/10.1177/002199838702100504.
  10. Jerome T. Tzeng. Prediction and Experimental Verification of Residual Stresses in Thermoplastic Composites. Journal of Thermoplastic Composite Materials. April 1995, vol. 8, no. 2, pp. 163—179. DOI: http://dx.doi.org/10.1177/089270579500800202.
  11. Tzeng T., Chien L.S. A Thermal Viscoelastic Analysis for Thick-Walled Composite Cylinders. Journal of Composite Materials March. 1995, vol. 29, no. 4, pp. 525—548.
  12. Wisnom M.R., Stringer L.G., Hayman R.J., Hinton M.J. Curing Stresses in Thick Polymer Composite Components. Part I: Analysis. 12th International Conference on Composite Materials, Paris, July 1999. Woodhead Publishing Ltd, 1999, p. 859. Available at: http://iccm-central.org/Proceedings/ICCM12proceedings/site/papers/pap859.pdf.
  13. Li C., Wisnom M.R., Stringer L.G., Hayman R., Hinton M.J. Effect of Mandrel Contact on Residual Stresses During Cure of Filament Wound Tubes. 8th International Conference on Fibre Reinforced Composites, 13—15 September 2000, Newcastle-upon-Tyne, UK. 2000, pp. 105—112.
  14. Gorbatkina Yu.A. Adhesive Strength of Fibre-Polymer Systems. New York, London, Ellis Horwood, 1992, 264 p.
  15. Turusov R.A. Adgezionnaya mekhanika [Adhesion Mechanics]. Moscow, MGSU Publ., 2015, 230 p. (In Russian)
  16. Babich V.F. Issledovanie vliyaniya temperatury na mekhanicheskie kharakteristiki zhestkikh setchatykh polimerov : avtoreferat dissertatsii … kandidata tekhnicheskikh nauk [Study of Temperature Influence on the Mechanical Properties of Rigid Cross-Linked Polymers : Abstract of the Dissertation of Candidate of Technical Sciences]. Moscow, 1966, 12 p. (In Russian)
  17. Gurevich G.I. Deformiruemost’ sred i rasprostranenie seysmicheskikh voln [Deformability of Media and Propagation of Seismic Waves]. Moscow, Nauka Publ., 1974, 482 p. (In Russian)
  18. Nemat-Nasser S., Hori M. Micromechanics: Overall Properties of Heterogeneous Materials. Amsterdam, Elsevier Science Publishers, 1993.
  19. Aboudi J. Mechanics of Composite Materials, a Unified Micromechanical Approach. Amsterdam, Elsevier Science Publishers, 1991.
  20. Zihui Xia, Yunfa Zhang, Fernand Ellyin. A Unified Periodical Boundary Conditions for Representative Volume Elements of Composites and Applications. International Journal of Solids and Structure. April 2003, vol. 40, issue 8, pp. 1907—1921. DOI: http://dx.doi.org/10.1016/S0020-7683(03)00024-6.
  21. Zheng-Ming Huang, Li-min Xin. Stress Concentration Factors of Matrix in a Compo-Site. Subjected to Transverse Loads. ICCM 2014, July 28—30. Cambridge, 3 p. Available at: http://www.sci-en-tech.com/ICCM2014/PDFs/321-979-1-PB.pdf.

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Compliance with the increased demands on the curing of hardening concrete in the process of transport facilities construction

Vestnik MGSU 10/2013
  • Solov'yanchik Aleksandr Romanovich - JSC «Scientific Research Institute of Transport Construction» (JSC CNIIS) Doctor of Technical Sciences, Professor, Chief Research Scientist, JSC «Scientific Research Institute of Transport Construction» (JSC CNIIS), 1, Kol’skaya st., Moscow, 129329, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ginzburg Aleksandr Vladimirovich - Scientific Production Association «Cosmos» (LLK «NPO «KOSMOS») Candidate of Technical Sciences, Vice-President for Regional Development, Scientific Production Association «Cosmos» (LLK «NPO «KOSMOS»), 38-25, Shosse Entuziastov, Moscow, 111123, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Pulyaev Ivan Sergeevich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, associate Professor, Department of construction materials, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 156-165

Recently the requirements to the high quality of works for critical groups of buildings are more rigid in Russia. This also concerns the transport structures, which play the key role, such as bridges, tunnels, overpasses and other similar facilities. Particularly high requirements for these structures are: reliability, frost resistance, water resistance, crack resistance and durability. In this article the main principles of providing high consumer properties of these objects are highlighted. Modern achievements in concrete researches are used, which are based on scientific studies performed in JSC CNIIS.The main problem in the process of concrete curing is not only in thermostressed state, which depends on the temperature and on the features of structure formation related to the changes in temperature regime of hardening concrete. The service properties of concrete are also influenced by different kinds of thermal stresses, occurring during concrete hardening: submicrostresses, microstresses and macrostresses. A special role in the theory of concrete hardening is played by the so-called own (or residual) thermal stress, which increases or decreases fracture of constructions. With the help of the accounting for these types of thermal stresses, the author shows how to increase crack resistance of concrete constructions without use of extra means of protection from temperature cracks. Furthermore, the author vividly shows, how to consider the magnitude of the temperature drops properly, which occur in concrete and lead to the formation of residual thermal stresses. The research of thermal stresses helps to reduce the cost of the device for additional thermal insulation of concrete, and to achieve high consumer properties of a construction. Positive results from the performed work were used in the construction of a number of transport tunnels in the city of Moscow, which led to the acceleration of their construction and reduced the cost of providing perfect quality of performed works.

DOI: 10.22227/1997-0935.2013.10.156-165

References
  1. Luk'yanov V.S., Denisov I.I. Raschet termouprugikh deformatsiy massivnykh betonnykh opor mostov dlya razrabotki mer po povysheniyu ikh treshchinostoykosti [Thermoelastic Deformation Analysis of Concrete Plate Piers for the Methods Development for Increasing their Crack Resistance]. Sbornik trudov TsNIIS [Collected works of the Central Research Institute of Transport Construction]. Moscow, TsNIIS Publ., 1970, no. 36, pp. 4—43.
  2. Luk'yanov V.S., Solov'yanchik A.R. Fizicheskie osnovy prognozirovaniya sobstvennogo termonapryazhennogo sostoyaniya betonnykh i zhelezobetonnykh konstruktsiy [Physical Basis of Predicting the Own Termostressed State of Concrete and Reinforced Concrete Structures]. Sbornik trudov TsNIIS [Collected works of the Central Research Institute of Transport Construction]. Moscow, TsNIIS Publ., 1972, no. 75, pp. 36—42.
  3. Sychev M.M. Tverdenie vyazhushchikh veshchestv [The Hardening of the Binders]. Leningrad, Stroyizdat Publ., 1974, 80 p.
  4. Sychev M.M. Tverdenie tsementov [Hardening of the Cements]. Leningrad, LTI imeni Lensoveta Publ., 1981, 88 p.
  5. Schoppel K., Plannerer M. Springenschmid R. Determination of Restraint Stresses of Material Properties during Hydration of Concrete with the Temperature-stress Testing Machine. Proceedings of the International RILEM Symposium. Munich, 1994, no. 25, pp. 153—160.
  6. Solovyanchik A.R., Krylov B.A., Malinsky E.N. Inherent Thermal Stress Distributions in Concrete Structures and Method for their Control. Thermal Cracking in Concrete at Early Ages. Proceedings of the International RILEM Symposium. Munich, 1994, no. 25, pp. 369—376.
  7. Thielen G., Hintzen W. Investigation of Concrete Behavior under Restraint with a Temperature-stress Test Machine. Proceedings of the International RILEM Symposium. Munich, 1994, no. 25, pp. 142—152.
  8. Antonov E.A. Tekhnologicheskaya osobennost' kachestva — real'naya sistema organizatsii stroitel'stva sooruzheniy s garantirovannoy ekspluatatsionnoy nadezhnost'yu [Technological Feature of the Quality — a Real Construction Organizational System with the Guaranteed Servicability]. Sbornik trudov TsNIIS [Collected works of the Central Research Institute of Transport Construction]. Moscow, TsNIIS Publ., 2003, no. 217, pp. 222—226.
  9. Solov'yanchik A.R., Sychev A.P., Shifrin S.A. Opyt provedeniya rabot po vyyavleniyu i ustraneniyu defektov i treshchin pri stroitel'stve Gagarinskogo i Volokolamskogo tonneley v g. Moskve [An Experience in Localizing and Fixing the Defects and Cracks in the process of Constructing Gagarinskiy and Volokolamskiy Tonnels in Moscow]. Sbornik trudov TsNIIS [Collected works of the Central Research Institute of Transport Construction]. Moscow, TsNIIS Publ., 2002, no. 209, pp. 6—18.
  10. Shifrin S.A. Uchet neritmichnosti tekhnologicheskikh protsessov pri vybore i obosnovanii rezhimov betonirovaniya raznomassivnykh konstruktsiy transportnykh sooruzheniy [Accounting for the Unsteadiness of Technological Processes in the process of Choosing and Rationalizing Concrete Pouring Regimes of Transport Facilities Constructions]. Sbornik trudov TsNIIS [Collected works of the Central Research Institute of Transport Construction]. Moscow, TsNIIS Publ., 2003, no. 217, pp. 206—216.

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INTERACTION OF A LONG PILE OF FINITE STIFFNESS WITH SURROUNDING SOIL AND FOUNDATION CAP

Vestnik MGSU 9/2015
  • Ter-Martirosyan Armen Zavenovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor of the Department of Soil Mechanics and Geotechnics, Head of Research and Education Center «Geotechnics», Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Ter-Martirosyan Zaven Grigor’evich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Department of Soil Mechanics and Geotechnics, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Trinh Tuan Viet - Moscow State University of Civil Engineering (National Research University) (MGSU) postgraduate student, Department of Soil Mechanics, Bases and Foundations, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 72-83

The article presents the formulation and analytical solution to a quantification of stress strain state of a two-layer soil cylinder enclosing a long pile, interacting with the cap. The solution of the problem is considered for two cases: with and without account for the settlement of the heel and the underlying soil. In the first case, the article is offering equations for determining the stresses of pile’s body and the surrounding soil according to their hardness and the ratio of radiuses of the pile and the surrounding soil cylinder, as well as formulating for determining equivalent deformation modulus of the system “cap-pile-surrounding soil” (the system). Assessing the carrying capacity of the soil under pile’s heel is of great necessity. In the second case, the article is solving a second-order differential equation. We gave the formulas for determining the stresses of the pile at its top and heel, as well as the variation of stresses along the pile’s body. The article is also formulating for determining the settlement of the foundation cap and equivalent deformation modulus of the system. It is shown that, pushing the pile into underlying layer results in the reducing of equivalent modulus of the system.

DOI: 10.22227/1997-0935.2015.9.72-83

References
  1. Nadai A. Theory of Flow and Fracture of Solids. Vol. 1. New York, McGraw-Hill, 1950, 572 p.
  2. Florin V.A. Osnovy mekhanicheskikh gruntov [Fundamentals of Mechanical Soil]. Vol. 1. Moscow, Gosstroyizdat Publ., 1959, 356 p. (In Russian)
  3. Telichenko V.I., Ter-Martirosyan Z.G. Vzaimodeystvie svai bol’shoy dliny s nelineyno deformiruemym massivom grunta [Interaction between Long Piles and the Soil Body Exposed to NonLinear Deformations]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2012, no. 4, pp. 22—27. (In Russian)
  4. Ter-Martirosyan Z.G., Nguen Zang Nam. Vzaimodeystvie svay bol’shoy dliny s neodnorodnym massivom s uchetom nelineynykh i reologicheskikh svoystv gruntov [Interaction between Long Piles and a Heterogeneous Massif with Account for Non-linear and Rheological Properties of Soils]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2008, no. 2, pp. 3—14. (In Russian)
  5. Ter-Martirosyan Z.G., Trinh Tuan Viet. Vzaimodeystvie odinochnoy dlinoy svai s osnovaniem s uchetom szhimaemosti stvola svai [Interaction between a Single Long Pile and the Bedding with Account for Compressibility of the Pile Shaft]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 8, pp. 104—110. (In Russian)
  6. Mattes N.S., Poulos H.G. Settlement of Single Compressible Pile. Journal SoilMech. Foundation ASCE. 1969, vol. 95, no. 1, pp. 189—208.
  7. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p. (In Russian)
  8. Ter-Martirosyan A.Z., Ter-Martirosyan Z.G., Trinh Tuan Viet, Luzin I.N. Osadka i nesushchaya sposobnost’ dlinnoy svai [Settlement and Bearing Capacity of Long Pile]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2015, no. 5, pp. 52—60. (In Russian)
  9. Coyle H.M., Reese L.C. Load Transfer for Axially Loaded Piles in Clay. Journal Soil Mechanics and Foundation Division, ASCE. March1996, vol. 92, no. 2, pp. 1—26.
  10. Bartolomey A.A., Omel’chak I.M., Yushkov B.S. Prognoz osadok svaynykh fundamentov [Forecasting the Settlement of Pile Foundation]. Moscow, Stroyizdat Publ., 1994, 384 p. (In Russian)
  11. Randolph M.F., Wroth C.P. Analysis of Deformation of Vertically Loaded Piles. Journal of the Geotechnical Engineering Division, American Society of Civil Engineers. 1978, vol. 104, no. 12, pp. 1465—1488.
  12. Van Impe W.F. Deformations of Deep Foundations. Proc. 10th Eur. Conf. SM & Found. Eng., Florence. 1991, vol. 3, pp. 1031—1062.
  13. Prakash S., Sharma H.D. Pile Foundation in Engineering Practice. John Wiley & Sons, 1990, 768 p.
  14. Malyshev M.V., Nikitina N.S. Raschet osadok fundamentov pri nelineynoy zavisimosti mezhdu napryazheniyami i deformatsiyami v gruntakh [Calculation of the Base Settlements in Non-Linear Relation between Stresses and Displacements of Soil]. Osnovaniya, fundamenty i mekhanika gruntov [Bases, Foundations and Soil Mechanics]. 1982, no. 2, pp. 21—25. (In Russian)
  15. Hansen J.B. Revised and Extended Formula for Bearing Capacity. Bulletin 28. Danish Geotechnical Institute, Copenhagen, 1970, pp. 5—11.
  16. Joseph E.B. Foundation Analysis and Design. McGraw-Hill, Inc, 1997, 1240 p.
  17. Ter-Martirosyan Z.G., Strunin P.V., Trinh Tuan Viet. Szhimaemost’ materiala svai pri opredelenii osadki v svaynom fundamente [The Influence of the Compressibility of Pile Material in Determining the Settlement of Pile Foundation]. Zhilishchnoe stroitel’stvo [Housing Construction]. 2012, no. 10, pp. 13—15. (In Russian)
  18. Vijayvergiya V.N. Load-Movement Characteristics of Piles. Proc. Port 77 conference, American Society of Civil Engineers, Long Beach, CA, March 1977, pp. 269—284.
  19. Seed H.B., Reese L.C. The Action of Soft Clay along Friction Piles. Trans., ASCE. 1957, vol. 122, no. 1, pp. 731—754.
  20. Booker J., Poulos H.G. Analysis of Creep Settlement of Pile Foundation. Journal Geotechnical Engineering division. ASCE. 1976, vol. 102, no. 1, pp. 1—14.
  21. Poulos H.G., Davis E.H. Pile Foundation Analysis and Design. New York, John Wiley and Sons, 1980, 397 p.

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STRENGTHENING AND ANALYSIS OF STEEL STRU CT URES MADE OF THIN-WALLED COLD-BENT PROFILES WITH ACCOUNT FOR THE YIELD OF JOINT CONNECTIONS

Vestnik MGSU 11/2012
  • Kunin Yuriy Saulovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Chair, Department of Testing of Structures; +7 (495) 287-49-14, ext. 1331, 1150., Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kolesov Aleksandr Ivanovich - Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU) Candidate of Technical Sciences, Professor, Chair, Department of Metal Structures, +7 (831) 430-54-88, Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU), 65, Ilinskaya St., Nizhny Novgorod 603950, Russian Federation.
  • Yambaev Ivan Anatolevich - Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU) Candidate of Technical Sciences, Associate Professor, Department of Metal Structures, +7 (831) 430-54-88, Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU), 65, Ilinskaya St., Nizhny Novgorod 603950, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Morozov Dmitriy Aleksandrovich - Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU) postgraduate student, Department of Metal Structures, +7 (831) 430-54-88, Nizhny Novgorod State University of Architecture and Civil Engineering (NNGASU), 65, Ilinskaya St., Nizhny Novgorod 603950, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 74 - 81

A light steel thin-walled structure is very effective. The durability and strength of structures,
investment efficiency, high construction intensity, excellent technical and operational characteristics,
backed by extensive architectural solutions make the employment of the technology of light
steel thin-walled structures particularly efficient in low-rise commercial construction. Light steel thinwalled
structures represent a relatively new area, therefore, the regulatory base required for a reliable
analysis of these st ructures is unavailable, and this fact limits their use in construction. Russia
has no special norms regulating the above parameters. The underdeveloped regulatory framework
in Russia gives rise to the problem of market saturation with cheap low-quality fasteners.
The purpose of testing is to determine the mechanical properties of steel . The tests were applied
to five separate self-tapping screw connections. The purpose of testing was also to determine
the bearing capacity and the stress-strain state of connections.
Numerical calculations using the finite element method required a steel diagram. MGSU specialists
mad e tensile test specimen to determine the physical and mechanical properties of coldformed
thin-walled steel profiles at the "Sector for Testing of Building Structures". Identification of
pliability of connections was required to employ the dependence obtained using numerical calculations
of structures. As a result of the work performed at MGSU, a diagram of thin-walled cold-formed
steel profiles was generated.

DOI: 10.22227/1997-0935.2012.11.74 - 81

References
  1. Kunin Yu.S, Katranov I.G. Optimizatsiya primeneniya vytyazhnykh zaklepok i samosverlyashchikh samonarezayushchikh vintov v soedineniyakh LSTK [Optimization of Use of Pop Rivets and Self-Drilling Self-Tapping Screws in Connections of Light-steel Thin-walled Structures]. Stroitel’nye materialy, oborudovanie, tekhnologii XXI veka [Construction Materials, Equipment, Technologies of the XXI Century]. 2010, no. 7, pp. 35—37.
  2. Kunin Yu.S, Katranov I.G. K voprosu rascheta vintovykh soedineniy legkikh stal’nykh tonkostennykh konstruktsiy na rastyazhenie [Analysis of Screw Connections of Light Steel Thin-walled Structures in Tension]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2011, no. 3, pp. 9—11.
  3. Katranov I.G. Ispytaniya i raschet vintovykh soedineniy legkikh stal’nykh tonkostennykh konstruktsiy na rastyazhenie [Testing and Analysis of Screw Connections of Light Steel Thin-walled Structures in Tension]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 2, pp. 89—93.
  4. Kikot’ A.A., Kornitskaya M.N., Murzin E.V. Programma rascheta progibov izgibaemykh elementov iz stal’nykh tonkostennykh kholodnognutykh profiley [Software for the Calculation of Deflections of Flexural Elements Made of Thin-walled Cold-formed Steel Profiles]. Proektirovanie i stroitel’stvo v Sibiri [Design and Construction in Siberia]. 2010, no. 4, pp. 8—10.
  5. Teplykh A.V. Primenenie obolochechnykh i ob”emnykh elementov pri raschetakh stroitel’nykh stal’nykh konstruktsiy v programmakh SCAD i Nastran s uchetom geometricheskoy i fi zicheskoy nelineynosti [The Use of Envelope and 3D Elements in the Calculation of Building Steel Structures Using SCAD and Nastran Software with Account for Geometrical and Physical Nonlinearity]. Magazine of Civil Engineering, no. 3, pp. 4—20.
  6. Katranov I.G., Kunin Yu.S. Eksperimental’nye issledovaniya raboty vytyazhnykh zaklepok i vintov v soedineniyakh LSTK. Predotvrashchenie avariy zdaniy i sooruzheniy. [Experimental Examinations of Performance of Rivets and Screws in Connections of Light Steel Thin-walled Structures. Prevention of Failure of Buildings and Structures]. Available at: http://www.pamag.ru/pressa/experiment-zv-lstk. Date of access: 19.09.2012.
  7. Bryzgalov A.V. K raschetu nesushchey sposobnosti soedineniy samosverlyashchimi samonarezayushchimi vintami [Analysis of the Bearing Capacity of Connections of Self-drilling Self-tapping Screws]. Krepezh, klei, instrument i…. [Fasteners, Glues, Tools and ….]. 2006, no. 2. Available at: http://www.navek.ru/index.php?page=sections&id=184&page_num=
  8. Kozhevnikov V.F. Raschet mestnoy podatlivosti elementov mnogoryadnogo dvusreznogo boltovogo soedineniya [Analysis of Local Yield of Elements of Multi-raw Double-cut Bolted Connections]. Uchenye zapiski TsAGI [Scientific Notes of Central Aerohydrodynamic Institute]. 1982, no. 1, pp. 57—63.
  9. Anan’in M.Yu., Fomin N.I. Metod ucheta podatlivosti v uzlakh metallicheskikh konstruktsiy zdaniy [Method of Analysis of Yield of Joints of Metal Structures of Buildings]. Akademicheskiy vestnik UralNIIproekt RAASN [Academic Bulletin of the Ural Scientific and Research Institute of the Russian Academy of Architectural and Construction Sciences]. 2010, no 2, pp. 72—74.
  10. Ayrumyan E.L. Rekomendatsii po proektirovaniyu, izgotovleniyu i montazhu konstruktsiy karkasa maloetazhnykh zdaniy i mansard iz kholodnognutykh stal’nykh otsinkovannykh profiley OOO «Balt-Profil’» [Recommendations concerning Design, Manufacturing and Assembly of the Structural Frame of Low-rise Buildings and Mansards Made of Cold-formed Galvanized Steel Profiles of LLC “Balt-Profile”]. Moscow, 2004, 70 p.
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Simulating pseudotruss excavating part of excavators

Vestnik MGSU 3/2019 Volume 14
  • Zotov Oleg A. - Pneumax engineer, Pneumax, 30 vlad. Communal proezd, Khimki, 141400, Russian Federation.
  • Gustov Dmitriy Yu. - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Associate Professor of Department of Construction Mechanization, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 376-385

Introduction. Single-dipper hydraulic excavators are becoming widely used multifunctional machines. Upgrading the machine as a whole and its assemblies is an actual problem to be solved with the aim of reducing material consumption and increasing stability and throughput. The article presents results of computer simulation of the excavating part designed to reduce the weight of the equipment. These data can be used to improve the equipment of excavators when operating with non-standard excavating equipment of increased weight. Materials and methods. The excavating equipment of the Hitachi ZX270 excavator is taken as a prototype. Computer simulating and calculation of the excavating part is conducted using the T-FLEX software. The calculation is carried out for different modes of the excavator operation and for different orientations of the jig boom, dipper stick and dipper relative to each other: excavating with the entire width of the dipper, single-tooth excavating, swiveling the loaded excavator for unloading. The highest stresses arise in structural members in the considered calculation cases. The calculations are performed without accounting the oscillations occurring at transient operating modes and during locking. Results. The study determines a stress-deformed condition of the pseudotruss excavating part structures of the excavator with various lightened makes selected on the basis of computer simulation. Zones of the highest stresses and largest deformations are revealed as well as suggestions on their decrease are made. The research results are used to optimize the jig boom and dipper stick structures by the criterion of generated stress minimization. Conclusions. The obtained data and formulated recommendations are the basis for further detailed simulation of pseudotruss excavating part structures of excavators and other machines of various layouts and purposes.

DOI: 10.22227/1997-0935.2019.3.376-385

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