Method for determining initial characteristics of the most unfavorable accelerograms for linear systems with finite number of degrees of freedom

Vestnik MGSU 8/2015
  • Mkrtychev Oleg Vartanovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Head of Research Laboratory “Reliability and Earthquake Engineering”, Professor, Department of Strength of Materials, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Reshetov Andrey Aleksandrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, engineer, Research Laboratory “Reliability and Earthquake Engineering”, 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 80-91

The paper proposes a method of determining the baseline characteristics of accelerograms required for their synthesis. Accelerograms generated according to them transmit maximum impact energy of the seismic action to a construction. However, they are possible with a certain probability for a given construction site. To solve this problem were obtained seismic characteristics of the construction site and dynamic characteristics of the structure. Then was formed the target function characterizing the energy transmitted to the structure. Characteristics corresponding to the maximum of the target function will be most unfavorable baseline characteristics of accelerograms. As construction was considered a linear system with a finite number of degrees of freedom. In paper were obtained impulse and frequency responses of the considered linear system. As the seismic characteristics of the construction site have been obtained some characteristics of accelerograms. Such as the spectral density, distribution law dominant frequency, envelope. In paper as the target function is considered the dispersion of the displacement of the highest floor of the system. As varied parameter is considered a shift of the initial spectral density of the impact. On the shift parameter imposed probabilistic restrictions due to the law of the distribution of the dominant frequency. The use of the proposed method when generating accelerograms will allow to calculate seismic stability the most complete way.

DOI: 10.22227/1997-0935.2015.8.80-91

References
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  2. Mkrtychev O.V., Yur’ev R.V. Raschet konstruktsiy na seysmicheskie vozdeystviya s ispol’zovaniem sintezirovannykh akselerogramm [Structural Analysis on Seismic Effects Using Synthesized Accelerograms]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2010, no. 6, pp. 52—54. (In Russian)
  3. Mkrtychev O.V., Reshetov A.A. Metodika modelirovaniya naibolee neblagopriyatnykh akselerogramm zemletryaseniy [Methods of Modeling the Most Unfavorable Earthquake Accelerograms]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2013, no. 9, pp. 24—26. (In Russian)
  4. Nazarov Yu.P., Poznyak E.V., Filimonov A.V. Analiz vida volnovoy modeli i poluchenie raschetnykh parametrov seysmicheskogo vozdeystviya dlya vysotnogo zdaniya [Wave Model Analysis and Obtaining Estimated Parameters of the Seismic Action for Tall Buildings]. Promyshlennoe i grazhdanskoe stroitel’stvo [Industrial and Civil Engineering]. 2014, no. 5, pp. 40—45. (In Russian)
  5. Nazarov Yu.P., Poznyak E.V. O prostranstvennoy izmenchivosti seysmicheskikh dvizheniy grunta pri raschetakh sooruzheniy [On Space Variability of Seismic Movements of Soil at Structural Analysis]. Osnovaniya, fundamenty i mekhanika gruntov [Soil Mechanics and Foundation Engineering]. 2014, no. 5, pp. 17—20. (In Russian)
  6. Pshenichkina V.A., Zolina T.V., Drozdov V.V., Kharlanov V.L. Metodika otsenki seysmicheskoy nadezhnosti zdaniy povyshennoy etazhnosti [Methods of Estimating Seismic Reliability of High-Rise Buildings]. Vestnik Volgogradskogo gosudarstvennogo arkhitekturno-stroitel’nogo universiteta. Seriya: Stroitel’stvo i arkhitektura [Bulletin of Volgograd State University of Architecture and Civil Engineering. Series: Construction and Architecture]. 2011, no. 25, pp. 50—56. (In Russian)
  7. Cacciola P. A Stochastic Approach for Generating Spectrum Compatible Fully Nonstationary Earthquakes. Computers & Structures. 2010, vol. 88, no. 15—16, pp. 889—901. DOI: http://dx.doi.org/10.1016/j.compstruc.2010.04.009.
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  11. Dzhinchvelashvili G.A., Mkrtychev O.V. Effektivnost’ primeneniya seysmoizoliruyushchikh opor pri stroitel’stve zdaniy i sooruzheniy [Effectiveness of Seismic Isolation Bearings during the Construction of Buildings and Structures]. Transportnoe stroitel’stvo [Transpot Construction]. 2003, no. 9, pp. 27—31. (In Russian)
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  14. Tamrazyan A.G., Tomilin V.A. Nesushchaya sposobnost’ konstruktsiy vysotnykh zdaniy pri lokal’nykh izmeneniyakh fiziko-mekhanicheskikh kharakteristik materialov [Bearing Capacity of High-Rise Structures under Local Changes of Physical-Mechanical Characteristics of Materials]. Zhilishchnoe stroitel’stvo [Housing Construction]. 2007, no. 11, pp. 24—25. (In Russian)
  15. Trifonov O.V. Modelirovanie dinamicheskoy reaktsii konstruktsiy pri dvukhkomponentnykh seysmicheskikh vozdeystviyakh [Simulation of Dynamic Response of Structures at Two-Component Seismic Impacts]. Seysmostoykoe stroitel’stvo. Bezopasnost’ sooruzheniy [Antiseismic Construction. Safety of Structures]. 2000, no. 1, pp. 42—45. (In Russian)
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  20. Zentner I. Simulation of Non-Stationary Conditional Ground Motion Fields in the Time Domain. Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards. 2013, vol. 7, no. 1, pp. 37—48. DOI: http://dx.doi.org/10.1080/17499518.2013.763572.

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ENERGY METHOD OF ANALYSIS OF STABILITY OF COMPRESSED RODS WITH REGARD FOR CREEPING

Vestnik MGSU 1/2013
  • Chepurnenko Anton Sergeevich - Don State Technical University (DGTU) Candidate of Engineering Science, teaching assistant of the strength of materials department, Don State Technical University (DGTU), 162 Sotsialisticheskaya str., Rostov-on-Don, 344022; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Andreev Vladimir Igorevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, corresponding member of Russian Academy of Architecture and Construction Sciences, chair, 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 .
  • Yazyev Batyr Meretovich - Rostov State University of Civil Engineering (RSUCE) Doctor of Technical Sciences, Professor, Chair, Depart- ment of Strength of Materials; +7 (863) 201-91-09, Rostov State University of Civil Engineering (RSUCE), 162 Sotsialisticheskaya St., Rostov-on-Don, 344022, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 101-108

The problem of stability of polymer rods with account for creeping was resolved using the energy method customized by Tymoshenko and Ritz. Possible patterns of displacements were provided in the form of trigonometric series with undetermined coefficients. The principle of the minimal total potential energy of the system was taken as the basis. According to this principle, the form in which the potential energy has a minimum value is implemented in all possible patterns of deformation occurring due to the loss of stability. The energy method makes it possible to replace the solution of complex differential equations by the solution of simple linear algebraic equations. The result was obtained numerically using MatLab software applicable to different equations describing deformations and stresses caused by the exposure to creeping. The problem was solved for low and high density polyethylene. The equation of Maxwell and Thompson was

DOI: 10.22227/1997-0935.2013.1.101-108

References
  1. Aleksandrov A.V. Soprotivlenie materialov. Osnovy teorii uprugosti i plastichnosti [Strength of Materials. Fundamentals of the Theory of Elasticity and Plasticity]. Moscow, Vyssh. shk. publ., 2002, 400 p.
  2. Klimenko E.S., Amineva E.H., Litvinov S.V., Yazyev S.B., Kulinich I.I. Ustoychivost’ szhatykh neodnorodnykh sterzhney s uchetom fi zicheskoy nelineynosti materiala [Stability of Compressed Heterogeneous Rods with Account for the Physical Nonlinearity of the Material]. Rostov-on-Don, Rostov State University of Civil Engineering Publ., 2012, 77 p.
  3. Alfutov N.A. Osnovy rascheta na ustoychivost’ uprugikh system [Fundamentals of Stability Analysis of Elastic Systems]. Moscow, Mashinostroenie Publ., 1991, 336 p.
  4. Vol’mir A.S. Ustoychivost’ deformiruemykh system [Stability of Deformable Systems]. Moscow, Nauka Publ., 1975, 984 p.
  5. Timoshenko S.P. Ustoychivost’ uprugikh system [Stability of Elastic Systems]. Moscow, Gostekhizdat Publ., 1946.
  6. Andreev V.I. Nekotorye zadachi i metody mekhaniki neodnorodnykh tel [Some Problems and Methods of Mechanics of Heterogeneous Bodies]. Moscow, ASV Pub., 2002, 288 p.
  7. Turusov R.A. Temperaturnye napryazheniya i relaksatsionnye yavleniya v osesimmetrichnykh zadachakh mekhaniki zhestkikh polimerov [Thermal Stresses and Relaxation Phenomena in Axisymmetric Problems of Mechanics of Rigid Polymers]. Moscow, 1970, 104 p.
  8. Belous P.A. Ustoychivost’ polimernogo sterzhnya pri polzuchesti s uchetom nachal’noy krivizny [Stability of a Polymer Rod Exposed to Creeping with Regard for Its Initial Curvature]. Trudy Odesskogo politekhnicheskogo instituta [Works of Odessa Polytechnic Institute]. 2001, no. 2, pp. 43—46.
  9. Gurevich G.I. Deformiruemost’ sred i rasprostranenie seysmicheskikh voln [Deformability of Media and Propagation of Seismic Waves]. Moscow, Nauka Publ., 1974, 482 p.
  10. Gol’dman A.Ya. Prochnost’ konstruktsionnykh plastmass [Structural Plastic Strength]. Leningrad, Mashinostroenie Publ., 1979, 320 p.

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RESEARCH OF SYNERGETIC PROPERTIES OF HIGH-STRENGTH STRUCTURAL STEEL 14Х2GMR IN THE AFTERMATH OF EXPOSURE TO HEAT TREATMENT

Vestnik MGSU 6/2012
  • Gustov Yuriy Ivanovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Profes- sor, Department of Machinery, Machine Elements and Process Metallurgy; +7 (499) 183-94-95, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Rus- sian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Allattouf Hassan Lattouf - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Mechanic Equip- ment, Details of Machines and Technology of Metals, 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 79 - 82

The article represents a brief overview of the properties of steel type 14X2GMR (Russian standards), a high-performance synergetic structural steel exposed to different modes of heat treatment.
The author demonstrates that the best set of the steel properties was obtained upon its normalization (Option 5). An alternative option is Option 1 (water quenching). This steel demonstrates its ≈ 1,0, which indicates the proximity between the uniform δр value and the concentrated δc value as the constituents of δ, the elongation value.
The best set of δр ,Ψр ,p, c, Кзт and p/c values is demonstrated by the steel at the normal temperature of 20 °C. An alternative set of criteria properties is identified at -60 °С.
The final choice of the optimal heat treatment mode and the operating temperature is recommended to be based on the maximal values of = p/c and the static viscosity
c = 0,5(k - σT)1n[1/(1 - Ψ)].
Given the resistance of steel to cracking during welding (Δ= 1,5; PSK= -0,25<0), it can be recommended for heavy-duty welded parts and assemblies.

DOI: 10.22227/1997-0935.2012.6.79 - 82

References
  1. Bol’shakov V.I. Substrukturnoe uprochnenie konstruktsionnykh staley [Substructural Strengthening of Structural Steels], a monograph. Canada, 1998, 316 p.
  2. Spravochnik po spetsial’nym rabotam. Svarochnye raboty v stroitel’stve [Reference Book of Specialty Assignments. Welding in Construction]. Moscow, 1971, Part 1, 464 p.

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ENERGY AND RESOURCE EFFICIENCY OF TRIBOLOGICAL ENGINEERING METHODS APPLIED TO CONSTRUCTION MACHINERY AND EQUIPMENT

Vestnik MGSU 8/2012
  • Gustov Yuriy Ivanovich - Moscow State University of Civil Engineering Doctor of Technical Sciences, Professor, Department of Mechanical Equipment, Details of Construction Machines and Technology of Metals 8 (499) 183-94-95, 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 .
  • Voronina Irina Vladimirovna - Moscow State University of Civil Engineering Senior Lecturer, Department of Mechanical Equipment, Details of Construction Machines and Technology of Metals 8 (499) 182-16-87, 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 .
  • Orekhov Aleksey Aleksandrovich - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Mechanical Equipment, Elements of Machines and Technology of Metals 8 (499) 183- 94-95, 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 169 - 174

The subject matter of the article is the energy and resource efficiency of tribological engineering
methods applied to working sections and interfaces of construction machines and equipment
exposed to varied temperature and loading conditions. The relevance of the problem is based on the
need to increase the durability of working sections exposed to intensive wear and tear, to improve
the productivity and to reduce the material and power expenses associated with the maintenance
and repair of the above items of machinery. The solution is based on tribology-related achievements.
Effective tribological methods include surface cladding and spraying of wear-resistant materials
onto the wear surface, induction brazing of reinforcing hard alloys, thermal and chemicothermal
treatment, etc. The most effective is an integrated structural and surface-treatment method.
The resource efficiency of tribological methods is based on their energy efficiency at the stages
of manufacturing and operation. Extension of the service life of products shouldn't increase the
energy consumption rate. The latter is estimated with the help of the efficiency factor of tribological
systems.
The authors propose a new deformation and topography-related method of identification of the
efficiency factor of rubbing elements. It encompasses multiple friction and wear models.

DOI: 10.22227/1997-0935.2012.8.169 - 174

References
  1. Gustov Yu.I. Tribotekhnika stroitel’nykh mashin i oborudovaniya [Tribological Engineering of Construction Machinery and Equipment]. Moscow, MGSU, 2011, 197 p.
  2. Chikhos Kh. Sistemnyy analiz v tribonike [The System Analysis in Tribological Engineering]. Moscow, Mir Publ., 1982, 351 p.
  3. Kragel’skiy I.V., Dobychin M.N., Kombalov V.S. Osnovy raschetov na trenie i iznos [Fundamentals of Friction and Wear Analysis]. Moscow, Mashinostroenie Publ. 1977, 526 p.
  4. Gustov Yu.I., Voronina I.V. Povyshenie dolgovechnosti sredstv mekhanizatsii stroitel’stva [Increase of Durability of Construction Machinery]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 2, pp. 305—308.
  5. Gustov Yu.I., Voronina I.V., Orekhov A.A. Metodologiya issledovaniya tribomekhanicheskikh pokazateley stroitel’noy tekhniki [Methodology of Research of Tribological Engineering Performance Indicators of Construction Machinery]. Mekhanizatsiya stroitel’stva [Construction Machinery]. 2011, no. 8, pp. 10—12.
  6. Gustov Yu.I., Voronina I.V., Lyubushkin K.A. Metod otsenki deformatsionno-destruktivnykh pokazateley detaley stroitel’noy tekhniki [Method of Assessment of Deformation-destructive Indicators of Details of Construction Machinery]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 4, pp. 278—281.
  7. Gustov Yu.I. Voronina I.V. Energotopografi cheskiy metod issledovaniya iznosostoykosti rabochikh organov i sopryazheniy stroitel’noy tekhniki [Method of Power-driven Topographic Examination of Wear Resistance of Operating Elements and Interfaces of Construction Machines]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 2, pp. 273—277.
  8. Gustov Yu.I., Voronina I.V., Orekhov A.A. Opredelenie napryazheniy destruktsii metallov na osnove sinergetiki plasticheskoy deformatsii [Identification of Decomposition Strain of Metals through the employment of Synergetics of Plastic Deformation]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 8, pp. 172—175.
  9. Ivanova V.S., Balankin A.S., Bunin I.Zh. Sinergetika i fraktaly v materialovedenii [Synergetics and Fractals in Material Science]. Moscow, Nauka Publ.,1994, 383 p.
  10. Skudnov V.A. Predel’nye plasticheskie deformatsii metallov [Ultimate Plastic Deformations of Metals]. Moscow, Metallurgiya Publ., 1989, 176 p.

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STABILITY OF TRUNCATED CIRCULAR CONICAL SHELL EXPOSED TO AXIAL COMPRESSION

Vestnik MGSU 10/2012
  • Litvinov Vladimir Vital'evich - Rostov State University of Civil Engineering (RGSU) Director, Laboratory of Department of Strength of Materials, 8 (863) 201-91-36, Rostov State University of Civil Engineering (RGSU), 162 Sotsialisticheskaya St., Rostov-Don, 344022, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Andreev Vladimir Igorevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, corresponding member of Russian Academy of Architecture and Construction Sciences, chair, 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 .
  • Chepurnenko Anton Sergeevich - Don State Technical University (DGTU) Candidate of Engineering Science, teaching assistant of the strength of materials department, Don State Technical University (DGTU), 162 Sotsialisticheskaya str., Rostov-on-Don, 344022; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 95 - 101

The problem of stability of a freely supported truncated circular conical shell, compressed by the upper base of a uniformly distributed load per unit length , referred to the median shell surface and directed along the generatrix of the cone, was solved by the Ritz-Timoshenko energy method. The orthogonal system of curvilinear coordinates of the points of the middle surface of the shell was adopted to solve the problem. Possible displacements were selected in the form of double series approximation functions. The physical principle of inextensible generatrix of the cone exposed to buckling at the moment of instability was employed. In addition, the fundamental principle of continuum mechanics, or the principle of minimal total potential energy of the system, was taken as the basis. According to the linear elasticity theory, energy methods make it possible to replace the solution of complex differential equations by the solution of simple linear algebraic equations. As a result, the problem is reduced to the problem of identifying the eigenvalues in the algebraic theory of matrices. The numerical value of the critical load was derived through the employment of the software.

DOI: 10.22227/1997-0935.2012.10.95 - 101

References
  1. Vol’mir A.S. Ustoychivost’ deformiruemykh sistem [Stability of Deformable Systems]. Nauka Publ., 1967, 984 p.
  2. Birger I.A., Panovko Ya.G. Prochnost’. Ustoychivost’. Kolebaniya [Strength. Stability. Vibrations]. Reference book. Moscow, Mashinostroenie Publ., 1968, vol. 3, 568 p.
  3. Alfutov N.A. Osnovy rascheta na ustoychivost’ uprugikh sistem [Fundamentals of Analysis of Stability of Elastic Systems]. Moscow, Mashinostroenie Publ., 1991, 336 p.
  4. Gol’denveyzer A.L. Teoriya tonkikh uprugikh obolochek [Theory of Thin Elastic Shells]. Moscow – Leningrad, Gostekhizdat Publ., 1953, 544 p.
  5. Mushtari Kh.M. Priblizhennoe reshenie nekotorykh zadach ustoychivosti tonkostennoy konicheskoy obolochki krugovogo secheniya [Approximate Solution of Some Problems of Stability of Thin-walled Conical Shell with Circular Cross Section]. Prikladnaya matematika i mekhanika [Applied Mathematics and Mechanics]. 1943, vol. 7, no. 3, pp. 155—166.
  6. Grigolyuk E.I., Kabanov V.V. Ustoychivost’ obolochek [Stability of Shells]. Moscow, Nauka Publ., 1978.
  7. Timoshenko S.P. Ustoychivost’ uprugikh system [Stability of Elastic Systems]. Moscow, Gostekhizdat Publ., 1946.
  8. Baruch M., Harari O., Singer J. Low Buckling Loads of Axially Compressed Conical Shells. Trans. ASME, Ser. E., 1970, vol. 37, no. 2, pp. 384—392.
  9. Shtaerman I.Ya. Ustoychivost’ obolochek [Stability of Shells]. Works of Kiev Institute of Aviation. 1936, no. 1, pp. 12—16.
  10. Bryan G.N. Application of the Energy Test to the Collapse of a Thin Long Pipe under External Pressure. Proc. Cambridge Philos. Soc. 1988, vol. 6, pp. 287—292.

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