DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

DYNAMICALLY LOADED BAR:STABILITY AND KINEMATIC EQUATIONS OF MOTION

Vestnik MGSU 6/2013
  • Manchenko Maksim Mikhaylovich - St.Petersburg State University of Architecture and Civil Engineering (SPbGASU) postgraduate student, Department of Theoretical Mechanics; +7 (812) 296-20-22., St.Petersburg State University of Architecture and Civil Engineering (SPbGASU), 4 2nd Krasnoarmeyskaya st., 190005, St.Petersburg; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 71-76

Differential equations of motion for a bar are provided in this paper. The bar is exposed to the applied force that intensifies as the time progresses. The condition substantiating the trans-versal inertia force is identified using the equations. On top of the emerging inertia force, brief high-speed stress increases the yield stress of the material.The external force is accompanied by the eccentricity. Therefore, linear dimensions of the bar and its eccentricity make plastic behaviour possible both in compressed and stretched areas of the rod sections. Patterns of distribution of plastic deformations (one-sided and double-sided yield) are generated using the equations of motion for each case. Cauchy problems are supple- mented by the incoming conditions according to the principle of continuity of displacement and velocity.The criterion of stability loss is a condition when the variation of the exterior torque equals to the variation of the interior torque. At the same time, the variation of a longitudinal force must be equal to zero. Having completed a series of transformations, the author obtains the stability loss functional. It is calculated simultaneously with the motion equation. When the functional is equal to zero, the bearing capacity is exhausted.Moreover, there is a simplified method of identifying the critical force. The comparison of values with the testing findings demonstrates the efficiency of employment of the approximate method.

DOI: 10.22227/1997-0935.2013.6.71-76

References
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  3. Appleby-Thomas G.J., Hazell P.J. A Study on the Strength of an Armour-grade Aluminum under High Strain-rate Loading. Journal of Applied Physics, New York, American Institute of Physics. 2010, vol. 107, no. 12, p. 123508.
  4. Ma D., Chen D., Wu S., Wang H., Hou Y., Cai C. An Interrupted Tensile Testing at High Strain Rates for Pure Copper Bars. Journal of Applied Physics, New York, American Institute of Physics. 2010, vol. 108, no. 11, p. 114902.
  5. Pertsev A.K., Rukolayne A.Ya., Bolotin V.V., editor. Ustoychivost’ uprugoplasticheskikh sterzhney pri kratkovremennykh dinamicheskikh nagruzkakh [Stability of Elasto-plastic Rods Exposed to Short-term Dynamic Loads]. Problemy ustoychivosti v stroitel’noy mekhanike [Stability Problems in Structural Mechanics]. Tr. Vsesoyuzn. konf. po probl. ustoychivosti v stroit. mekhanike [Works of All-Russian Conference on Stability Problems in Structural Mechanics]. 1965, pp. 458—465.
  6. Nazaruk A.V. Issledovanie ustoychivosti szhatykh sterzhney, rabotayushchikh v uprugoplasticheskoy stadii pri dinamicheskikh nagruzkakh [Research into Stability of Elasto-plastic Behaviour of Compressed Rods Exposed to Dynamic Loads]. Leningrad, 1977, 23 p.
  7. Jones N. Structural Impact. Cambridge, Cambridge University Press. 2012, 604 p.
  8. Rybnov E., Sanzharovsky R., Beilin D. On the Durability of Reinforced Concrete Structures. Scientific Israel — Technological Advantages, Migdal Ha Emek. 2011, vol. 13, no. 4, pp. 111—121.

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ANALYSIS OF THE DYNAMIC LOAD APPLIED TO A CELLULAR COMMUNICATION MAST AND A CEILING PANEL ON WHICH IT RESTS

Vestnik MGSU 8/2012
  • Bakhtin Vadim Fedorovich - Expert Open Joint Stock Company Director, Civil Engineering Department 8 (473) 278-89-91, Expert Open Joint Stock Company, 82 Konstruktorov St., Voronezh, 394038, Russian Federation.
  • Chernikov Igor Yurevich - Expert Open Joint Stock Company Specialist in Examination of Buildings and Structures, Civil Engineering Department 8 (473) 278-89-91, Expert Open Joint Stock Company, 82 Konstruktorov St., Voronezh, 394038, Russian Federation.
  • Loktev Alexey Alexeevich - Moscow State University of Civil Engineering Candidate of Physical and Mathematical Sciences, Associated Professor, Department of Theoretical Mechanics and Aerodynamics 8 (499) 183-24-01, Moscow State University of Civil Engineering, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 66 - 75

Installation of antenna masts and towers that have cellular signal transmission equipment
mounted represents a relevant problem in the urban development. Given its density, as well as the
multiplicity of multistory residential and offi ce buildings, masts can be mounted onto existing buildings
and structures. For this purpose, the analysis of a metal mast itself and a ceiling panel on which it is
to rest should be performed in respect of different types of loading. This task is of utmost importance,
since original designs of buildings fail to take account of any supplementary static or dynamic loads.
Numerical and analytical methods are used for the purpose of the analysis. The analysis of cellular
signal transmission masts is performed numerically with the help of a software programme, while the
calculation of the ceiling panel is performed on the basis of a combined scheme. As a result, the authors
demonstrate the safety of installation of high-altitude masts onto existing structures exposed to
varying loads, including wind and ice loads.

DOI: 10.22227/1997-0935.2012.8.66 - 75

References
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  2. SanPiN 2.2.4/2.18.055—96. Sanitarnye pravila i normy na elektromagnitnye izlucheniya radiochastotnogo diapazona (EMI RCh): utv. postanovleniem Goskomsanepidnadzora ot 8.05.96 g. № 9. [Sanitary Rules and Norms 2.2.4/2.18.055—96. Sanitary Rules and Norms Applicable to Electromagnetic Emissions of the Radio Frequency Bandwidth, approved by the Resolution issued by the State Committee for Sanitary and Epidemiological Supervision on May 08, 1996, no. 9].
  3. OSTN 600—93. Otraslevye stroitel’no-tekhnologicheskie normy na montazh sooruzheniy i ustroystv svyazi, radioveshchaniya i televideniya: utv. prikazom Minsvyazi RF ot 15.07.93 g. № 168. [Industrial Construction Norms 600—93. Industrial Construction Norms Applicable to Installation of Communication, Radio and Television Structures and Facilities. Approved by the Order of the Ministry of Communications of the Russian Federation on July 15, 1993, no. 168].
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  7. SNiP 2.03.06—85. Alyuminievye konstruktsii. [Construction Norms and Rules 2.03.06—85. Aluminum Structures]. Moscow, State Construction Committee, 1985.
  8. Machty alyuminievye reshetchatye dlya radioreleynoy svyazi tipa MAR 5274-176-05775641-RE. Rukovodstvo po ekspluatatsii i montazhu. [Aluminum Latticework Masts for Radio Communication Systems of MAR 5274-176-05775641-RE Type. Guidelines for Operation and Installation].
  9. SNiP II-23—81*. Stal’nye konstruktsii. [Construction Norms and Rules II-23—81*. Steel Structures]. Moscow, State Construction Committee, 1989.
  10. Loktev A.A. Udarnoe vzaimodeystvie tverdogo tela i uprugoy ortotropnoy plastinki [Impact-driven Interaction between a Solid Body and an Elastic Orthotropic Plate]. Mekhanika kompozitsionnykh materialov i konstruktsiy [Mechanics of Composite Materials and Structures]. 2005, vol. 11, no. 4, pp. 478—492.
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  12. A fi nite element model for impact simulation with laminated glass / M. Timmel, S. Kolling, P. Osterrieder, P.A. Du Bois // International Journal of Impact Engineering. 2007. P. 1465—1678.
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Calculation of dynamic load impact on reinforced concrete arches in the ground

Vestnik MGSU 1/2016
  • Barbashev Nikita Petrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Senior Lecturer, Department of Reinforced Concrete and Masonry Structures, 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 35-43

Concrete arches are widely used in the construction of underground facilities. The analysis of their work under dynamic loads (blasting, shock, seismic) will improve the efficiency of design and application. The article addresses the problems of calculation of reinforced concrete arches in the ground in terms of the action of dynamic load - compression wave. The calculation is made basing on the decision of a closed system of equations that allows performing the calculation of elastic-plastic curved concrete structures under dynamic loads. Keeping in mind the properties of elastic-plastic reinforcement and concrete in the process of design variations, σ-ε diagrams are variable. The calculation is performed by the direct solution of differential equations in partial derivatives. The result is based on a system of ordinary differential equations of the second order (expressing the transverse and longitudinal oscillations of the structure) and the system of algebraic equations (continuity condition of deformation). The computer program calculated three-hinged reinforced concrete arches. The structural calculations were produced by selection of the load based on the criteria of reaching the first limit state: ultimate strain of compressed concrete; ultimate strain tensile reinforcement; the ultimate deformation of the structure. The authors defined all the characteristics of the stress-strain state of the structure. The presented graphs show the change of bending moment and shear force in time for the most loaded section of the arch, the dependence of stresses and strains in concrete and reinforcement, stress changes in time for the cross-sectional height. The peculiarity of the problem is that the action of the load provokes the related dynamic forces - bending moment and longitudinal force. The calculations allowed estimating the carrying capacity of the structure using the criteria of settlement limit states. The decisive criterion was the compressive strength of concrete.

DOI: 10.22227/1997-0935.2016.1.35-43

References
  1. Rastorguev B.S., Vanus D.S. Otsenka bezopasnosti zhelezobetonnykh konstruktsiy pri chrezvychaynykh situatsiyakh tekhnogennogo kharaktera [Safety Estimation of Reinforced Concrete Structures in Case of Emergencies]. Stroitel’stvo i rekonstruktsiya [Construction and Reconstruction]. 2014, no. 6 (56), pp. 83—89. (In Russian)
  2. Rastorguev B.S. Obespechenie zhivuchesti zdaniy pri osobykh dinamicheskikh vozdeystviyakh [Providing Reliability of Buildings in Case of Specific Dynamic Loads]. Seysmostoykoe stroitel’stvo. Bezopasnost’ sooruzheniy [Antiseismic Construction. Safety of Structures]. 2003, no. 4, pp. 45—48. (In Russian)
  3. Tamrazyan A.G. Rekomendatsii k razrabotke trebovaniy k zhivuchesti zdaniy i sooruzheniy [Recommendations to the Development of Requirements to Reliability of Buildings and Structures]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 2—1, pp. 77—83. (In Russian)
  4. Modena C., Tecchio G., Pellegrino C., da Porto F., Donà M., Zampieri P., Zaninix M.A.Reinforced Concrete and Masonry Arch Bridges in Seismic Areas: Typical Deficiencies and Retrofitting Strategies. Structure and Infrastructure Engineering. 2014, vol. 11, issue 4,pp. 415—442. DOI: http://dx.doi.org/10.1080/15732479.2014.951859.
  5. Wu Q.X., Lin L.H., Chen B.C. Nonlinear Seismic Analysis of Concrete Arch Bridge with Steel Webs. International Efforts in Lifeline Earthquake Engineering : Proceedings of the 6th China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering. 2014,
  6. pp. 385—392. DOI: http://dx.doi.org/10.1061/9780784413234.050.
  7. Tamrazyan A.G. K otsenke riska chrezvychaynykh situatsiy po osnovnym priznakam ego proyavleniya na sooruzhenie [Emergency Risk Estimation According to Its Main Indicators]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2001, no. 5, pp. 8—10.(In Russian)
  8. Filimonova E.A. Metodika poiska optimal’nykh parametrov zhelezobetonnykh konstruktsiy s uchetom riska otkaza [Identification of Optimal Parameters of Reinforced Concrete Structures with Account for the Probability of Failure]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2012, no. 10, pp. 128—133.
  9. Tamrazyan A.G., Dudina I.V. Obespechenie kachestva sbornykh zhelezobetonnykh konstruktsiy na stadii izgotovleniya [Providing the Quality of Precast Reinforced Concrete Structures on Production Stage]. Zhilishchnoe stroitel’stvo [Housing Construction]. 2001,no. 3, pp. 8—10. (In Russian)
  10. Tamrazyan A.G. Analiz riska kak instrument prinyatiya resheniy stroitel’stva podzemnykh sooruzheniy [Risk Analysis as an Instrument of Decision Making in Underground Construction]. Zhilishchnoe stroitel’stvo [Housing Construction]. 2012, no. 2, pp. 6—7.(In Russian)
  11. Gorbatov S.V., Smirnov S.G. Raschet prochnosti vnetsentrenno-szhatykh zhelezobetonnykh elementov pryamougol’nogo secheniya na osnove nelineynoy deformatsionnoy modeli [Calculating the Stability of Reinforced Concrete Beam Columns with Rectangular Cross-section Basing on Nonlinear Deformation Model]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 2, vol. 1, pp. 72—76. (In Russian)
  12. Zharnitskiy V.I., Belikov A.A. Eksperimental’noe izuchenie voskhodyashchikh i niskhodyashchikh uchastkov diagramm soprotivleniya betonnykh i zhelezobetonnykh prizm [Experimental Investigation of Upward and Downward Areas of a Diagram of a Resistance Log of Concrete and Reinforced Concrete Wedges]. Nauchnoe obozrenie [Scientific Review]. 2014, no. 7—1, pp. 93—98. (In Russian)
  13. Kurnavina S.O. Tsiklicheskiy izgib zhelezobetonnykh konstruktsiy s uchetom uprugoplasticheskikh deformatsiy armatury i betona [Cyclic Bending of Reinforced Concrete Structures with Account for Elastic-Plastic Deformetions of Reinforcement and Conncrete]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 2, vol. 1, pp. 154—158. (In Russian)
  14. Zharnitskiy V.I., Golda Yu.L., Kurnavina S.O. Otsenka seysmostoykosti zdaniya i povrezhdeniy ego konstruktsiy na osnove dinamicheskogo rascheta s uchetom uprugoplasticheskikh deformatsiy materialov [Evaluation of Seismic Resistance of a Building and Damages of its Structures Besing on the Dynamic Calculation with Account for Elastic-Plastic Deformations of a Material]. Seysmostoykoe stroitel’stvo. Bezopasnost’ sooruzheniy [Antiseismic Construction. Safety of Structures]. 1999, no. 4, p. 7. (In Russian)
  15. Schiesser W.E. and Griffiths G.W. A Compendium of Partial Differential Equation Models: Method of Lines Analysis with Matlab. United Kingdom, City University, 1 January 2009, pp. 1—476.
  16. Saucez P., Vande Wouwer A. Schiesser W.E., Zegeling P. Method of Lines Study of Nonlinear Dispersive Waves. Journal of Computational and Applied Mathematics. 1 July 2004, vol. 168, issue 1—2, pp. 413—423. DOI: http://dx.doi.org/10.1016/j.cam.2003.12.012.
  17. Bakhvalov N.S., Zhidkov N.P., Kobel’kov G.M. Chislennye metody [Numerical Methods]. 3rd edition, revised and enlarged. Moscow, BINOM. Laboratoriya znaniy Publ., 2012, 640 p. (In Russian)
  18. Timoshenko S.P. Kolebaniya v inzhenernom dele [Oscillations in Engineering]. Translated from English. 3rd edition. Moscow, KomKniga Publ., 2007, 440 p. (In Russian)
  19. Zharnitskiy V.I., Barbashev N.P. Kolebaniya krivolineynykh zhelezobetonnykh konstruktsiy pri deystvii intensivnykh dinamicheskikh nagruzok [Oscillations of Curved Reinforced Concrete Structures in Case of Intensive Dynamic Loads]. Nauchnoe obozrenie [Scientific Review]. 2015, no. 4, pp. 147—154. (In Russian)
  20. Belikov A.A., Zharnitskiy V.I. Uprugoplasticheskie kolebaniya zhelezobetonnykh balok pri deystvii poperechnoy i prodol’noy dinamicheskikh nagruzok [Elastic-Plastic Oscillations of Reinforced Concrete Beams in Case of Transverse and Longitudinal Dynamic Loads]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 2—1, pp. 145—147. (In Russian)
  21. Barbashev N.P. K raschetu zhelezobetonnogo kol’tsa v grunte na deystvie volny szhatiya [Calculation of a Reinforced Concrete Circle in Soil in Case of Compression Wave Action]. Nauchnoe obozrenie [Scientific Review]. 2015, no. 10—1, pp. 79—83. (In Russian)

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Collapse simulation of building constructions

Vestnik MGSU 9/2014
  • Nekrest'yanov Viktor Nikolaevich - Military Technical University (VTU) postgraduate student, Military Technical University (VTU), 8 Karbysheva str., Balashikha, Moscow Region, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 145-153

The physical reasons for building structures destruction are both the forces arising at stress-strain state of construction elements and external influences arising at emergency situations, as well as their moments, impulses and periodic impulses with the frequencies close to of fluctuations frequencies of construction elements. We shall call the mathematical calculation models for the parameters-reasons of destructions the basic models. The basic models of destruction of building structures elements allow not only providing necessary level of reliability and survivability of the elements and the construction as a whole already at the stage of their design, but also giving the chance, at their corresponding completion, to provide rational decisions on the general need of recovery works and their volume depending on destruction level. Especially important for rational design decisions development, which ensure the demanded constructional safety of building structures, is library creation of the basic mathematical models of standard processes of bearing elements destructions for standard construction designs for the purpose of the further forecast (assessment) of the level and probabilities of standard destructions. Some basic mathematical models of destructions processes of the standard elements of building structures are presented in the present article. A model of accounting for construction defects and a model of obtaining requirements to probabilities of partial destructions of a construction are given. Both of these models are probabilistic.

DOI: 10.22227/1997-0935.2014.9.145-153

References
  1. Almazov V.O., Cao Duy Kh?i. Dinamika progressiruyushchego razrusheniya monolitnykh mnogoetazhnykh karkasov [Dynamics of Progressing Destruction of Monolithic Multystoried Frameworks]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2010, no. 4, pp. 52—56.
  2. Bartolomey M.L. Chislennyy analiz protsessa razvitiya treshchin pri neravnomernykh osadkakh sooruzheniya [The Numerical Analysis of Crack Development at Uneven Settlement of a Construction]. Vychislitel'naya mekhanika sploshnykh sred [Computing Mechanics of Continuous Media]. 2012, vol. 5, no. 2, pp. 217—224.
  3. Gar'kin I.N. Analiz prichin obrusheniy promyshlennykh zdaniy [Analysis of the Reasons of Industrial Buildings Collapse]. Tekhnicheskie nauki: problemy i perspektivy : materialy Mezhdunarodnoy nauchnoy konferentsii (g. Sankt-Peterburg, mart 2011) [Technical Sciences: Problems and Prospects : Materials of the International Conference (Saint Petersburg, March 2011)]. Saint Petersburg, Renome Publ., 2011, pp. 27—29.
  4. Cao Duy Kh?i. Problema dinamicheskogo kharaktera vozdeystviy pri progressiruyushchem razrushenii [The Problem of the Dynamic Character of the Influences in Case of Progressive Collapse]. Stroitel'stvo — formirovanie sredy zhiznedeyatel'nosti : sbornik trudov 13-y Mezhdunarodnoy mezhvuzovskoy nauchno-prakticheskoy konferentsii molodykh uchenykh, aspirantov i doktorantov [Construction — Formation of Life Environment : Research Works of the 13th International Inter-university Science and Practice Conference of Young Researchers, Doctoral Students and Postgraduates]. Moscow, MGSU Publ., 2010, pp. 28—32.
  5. Soldatenko T.N. Model' identifikatsii i prognoza defektov stroitel'noy konstruktsii na osnove rezul'tatov ee obsledovaniya [Model of Identification and Forecast of Construction Design Defects on the Basis of its Inspection Results]. Inzhenerno-stroitel'nyy zhurnal [Engineering and Construction Magazine]. 2011, no. 7 (25), pp. 52—61.
  6. Yun' O.M. Proizvodstvo i logika: Informatsionnye osnovy razvitiya [Production and Logic: Information Bases of Development]. Moscow, Novyy vek Publ., 2001, 168 p.
  7. Calgaro J.-A., Gulvanessian H. Management of Reliability and Risk in the Eurocode System. Safety, Risk, and Reliability — Trends in Engineering. International Conference. Malta, 2001, pp. 155—160.
  8. Korn G., Korn T. Spravochnik po matematike (dlya nauchnykh rabotnikov i inzhenerov) [The Reference Book on Mathematics (for Scientists and Engineers)]. Moscow, Nauka Publ., 1973, 831 p.
  9. Ermakov V.A., Korgin A.B. Metodika MKE-otsenki nesushchey sposobnosti konstruktsiy s uchetom nalichiya defektov [Methods of FEM Estimation of the Bearing Capacity of Structures with Account for Imperfections]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2009, Special Issue no. 1, pp. 26—28.
  10. Belostotskiy A.M., Pavlov A.S. Raschet konstruktsiy bol'sheproletnykh zdaniy s uchetom fizicheskoy, geometricheskoy i konstruktivnoy nelineynostey [Calculation of the Designs of Wide-span Buildings Taking into Account Physical, Geometrical and Constructive Nonlinearities]. International Journal for Computational Civil and Structural Engineering. 2010, vol. 6, no. 1—2, pp. 80—87.
  11. Krivosheina M.N., Tuch E.V., Kobenko S.V. Vliyanie ucheta snizhennykh mekhanicheskikh svoystv v vysotnom napravlenii pregrad na ikh uprugoplasticheskoe deformirovanie i razrushenie [Influence of the Accounting for the Reduced Mechanical Properties in the High-rise Direction of Barriers on their Elastic-plastic Deformations and Destruction]. Mekhanika kompozitsionnykh materialov i konstruktsiy [Mechanics of Composite Materials and Designs]. 2010, vol. 16, no. 1, pp. 43—54.
  12. Bathurst R.J., Allen T.M., Nowak A.S. Calibration Concepts for Load and Resistance Factor Design (LRFD) of Reinforced Soil Walls. Canadian Geotechnical Journal. 2008, vol. 45, no. 10, pp. 1377—1392.
  13. Pavlov A.S. Chislennoe modelirovanie deformirovaniya i razrusheniya uzlov stroitel'nykh konstruktsiy [Numerical Modeling of Deformation and Destruction of Structural Connections]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 4, pp. 525—529.
  14. Birger I.A., Panovko Ya.G. Prochnost', ustoychivost', kolebaniya : spravochnik v 3 tomakh [Durability, Stability, Fluctuations : The Reference Book in 3 Volumes]. Mashinostroenie Publ., 1968, vol. 3, 568 p.
  15. Baziar M.H., Kashkooli A., Saeedi-Azizkandi A. Prediction of Pile Shaft Resistance Using Cone Penetration Tests (CPTs). Computers and Geotechnics. 2012, vol. 45, pp. 74—82. DOI: http://dx.doi.org/10.1016/j.compgeo.2012.04.005.
  16. Sladkova L.A., Abros'kin N.P., Nekrest'yanov V.N. Zayavka 2012125272 RF, MPK G01N3/00. Sposob opredeleniya prochnosti konstruktsii. Zayavitel' FGBOU VPO «VTU», ¹ 2012125272/28; zayavl. 19.06.2012; opubl. 20.01.2014. Byul. ¹ 2 [Application 2012125272 RF, MPK G01N3/00. Method of Determining the Structure Durability. Applicant: Military Technical University, no. 2012125272/28; notice 19.06.2012; publ. 20.01.2014. Bulletin no. 2]. 1 p.

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INTERACTION OF THE PILE AND SURROUNDING SOIL DURING VIBRATORY PILE DRIVING

Vestnik MGSU 3/2018 Volume 13
  • Sobolev Evgeniy Stanislavovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Assistant Professor of the Department Soil Mechanics and Geotechnics, Researcher at the Research and Education Center «Geotechnics», 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 .
  • Sidorov Vitaliy Valentinovich - National Research Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Assistant Professor of the Department Soil Mechanics and Geotechnics, Researcher at the Research and Education Center «Geotechnics», National Research 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 293-300

Subject: a computational scheme of the bottom of deep foundation for analyzing vibrations of the “pile-heavy foundation” system is proposed. It is shown that, in this case, accounting for inertial forces of the pile and friction along the lateral surface of the pile leads to a non-periodic (non-harmonic) damped oscillation of the deep foundation. Research objectives: assessment of displacement and resistance along the lateral surface of a pre-fabricated reinforced concrete pile under vibratory immersion; estimation of key factors affecting resistance of the pile in vibratory immersion. Materials and methods: when solving the problem of interaction between the pile and the surrounding soil during vibratory immersion, analytical solutions of the static and dynamic problems using modified rheological models of soils were used. Analytical solutions are obtained using the software package MathCAD. Comparison of the results of analytical calculations with numerical solutions is performed in the PLAXIS 2D geotechnical software package that implements the finite element method. In the numerical solution of the problem of interaction between the pile and the surrounding soil, an elastoplastic model with Mohr-Coulomb hardening was used. Results: when solving the problem of oscillation of the “system”, various contact models are considered for calculations, including elastic, nonlinear and rheological, taking into account time-dependent hardening. Rheological parameters of soils are used, which can be determined on the basis of special laboratory studies. Conclusions: the proposed scheme for interaction between the pile and the surrounding soil during vibratory immersion describes, with sufficient accuracy, the oscillations of a weighty pile on a viscoelastic soil base, taking into account the resistance along the lateral surface and the frictional forces at the pile-soil contact. The performed analytical and numerical analysis of the proposed model showed qualitative agreement. Allowance for friction along the lateral surface of a weighty pile significantly influences the vibration characteristics of a deep foundation.

DOI: 10.22227/1997-0935.2018.3.293-300

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