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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Simulation of structure interaction with the base in caseof earthquake

Вестник МГСУ 12/2013
  • Mkrtychev Oleg Vartanovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, head, Scientific Laboratory of Reliability and Seismic Resistance of Structures, Professor, Department of Strength of Materials, Moscow State University of Civil Engineering (National Research University) (MGSU), ; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Dzhinchvelashvili Guram Avtandilovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Strength of Materials, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Busalova Marina Sergeevna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Strength of Materials, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 34-40

The article focuses on the problem of calculating seismic impact on structures. The article studies the impact of structures on the changes in seismic load parameters. Studies are conducted with the use of direct dynamic calculation methods implementing explicit integration schemes equations of motion. Two computational models of monolithic reinforced concrete buildings on elastic half-space are considered: 9 and 16 storeys. The solution of the problem is found in time domain by direct integration of the equations of motion for the explicit scheme using software package LS-DYNA. The foundation simulation is performed using solid finite elements, and the bearing structures of buildings — using solid shell finite elements. The external action applied in the horizontal direction X is shown by accelerogram. Synthesized accelerogram is obtained by the Institute of Physics of the Earth of the Russian Academy of Sciences for Imereti lowland region, city of Sochi. In the study the authors used a specially developed method of calculation based on the algorithm of the base-structure interaction (interface soil-structure interaction). This algorithm can effectively simulate the interaction with linear and nonlinear deformable half-space in the form of a limited array with "transparent" borders. The results show that neglecting the change in external seismic impact parameters caused by the influence of the structures leads to errors in calculation results, which in turn can lead to deficiency of the bearing capacity and seismic resistance of building structures designed in seismic regions. When using the accepted methods of earthquake calculation based on existing regulations, the original design accelerograms should be set considering the dynamic characteristics of the designed buildings.

DOI: 10.22227/1997-0935.2013.12.34-40

Библиографический список
  1. Mkrtychev O.V., Dzhinchvelashvili G.A. Raschet zhelezobetonnogo monolitnogo zdaniya na zemletryasenie v nelineynoy postanovke [Calculation of Reinforced Concrete Monolithic Building in Case of Earthquake in Nonlinear Formulation]. Sbornik dokladov Mezhdunarodnoy nauchno-metodicheskoy konferentsii, posvyashchennoy 100-letiyu so dnya rozhdeniya V.N. Baykova. Moskva, 4-5 aprelya 2012 goda [Collected Reports of the International Scientific Conference Dedicated to the 100th Anniversary of V.N. Baykov. Moscow, 4-5 April, 2012]. Moscow, 2012, pp. 283—289.
  2. Mkrtychev O.V., Dzhinchvelashvili G.A. Otsenka nelineynoy raboty zdaniy i sooruzheniy pri avariynykh vozdeystviyakh [Evaluation of Nonlinear Operation of Buildings and Structures in Emergency Exposures]. Problemy bezopasnosti rossiyskogo obshchestva [Security Problems of the Russian Society]. 2012, no. 3, pp. 17—31.
  3. Mkrtychev O.V. Otsenka nadezhnosti mnogoetazhnogo zdaniya pri seysmicheskom vozdeystvii na osnove resheniya dinamicheskoy zadachi [Evaluation of a Multi-storey Building Reliability under Seismic Impacts Basing on Dynamic Problem Solution]. Seysmostoykoe stroitel'stvo [Antiseismic Construction]. 2001, no. 2, pp. 33—35.
  4. Mkrtychev O.V. Raschet bol'sheproletnykh i vysotnykh sooruzheniy na ustoychivost' k progressiruyushchemu obrusheniyu pri seysmicheskikh i avariynykh vozdeystviyakh v nelineynoy dinamicheskoy postanovke [Calculation of Long-span and High-rise Buildings for Resistance to Progressive Collapse under Seismic and Emergency Impacts in Nonlinear Dynamic Formulation]. Sbornik dokladov nauchnogo seminara «Aktual'nye problemy rascheta zdaniy i sooruzheniy na osobye vozdeystviya (vklyuchaya seysmicheskie i avariynye)». 21 maya 2009 goda [Current Issues of the Analysis of Buildings and Structures in Case of Emergency Effects (Including Seismic and Accidental). Scientific Workshop. May 21, 2009]. Moscow, MGSU Publ., 2009, pp. 1—9.
  5. Herrera I., Bielak J. Soil-structure Interaction as a Diffraction Problem. Proceedings of the 6th World Conference on Earthquake Engineering. New Delhi, India, 1977, vol. 2, pp. 1467—1472.
  6. Bielak J., Loukakis K., Hisada Y., Yoshimura C. Domain Reduction Method for Threedimensional Earthquake Modeling in Localized Regions, Part I: Theory. Bulletin of the Seismological Society of America. 2003, vol. 93, no. 2, pp. 817—824.
  7. Yoshimura C., Bielak J., Hisada Y., Fernandez A. Domain Reduction Method for Threedimensional Earthquake Modeling in Localized Regions, Part II: Verification and Applications. Bulletin of the Seismological Society of America. 2003, vol. 93, no. 2, pp. 825—841.

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FIELD TESTING OF DYNAMIC CHARACTERISTICS OF THE BUILDING OF A UNIVERSAL POOL UNDER CONSTRUCTION IN ANAPA

Вестник МГСУ 5/2012
  • Rumyantsev Anton Andreevich - Moscow State University of Civil Engineering (MSUCE) junior researcher, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Sergeevtsev Evgeniy Yur'evich - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Moscow State University of Civil Engineering (MSUCE), Mytishchi Branch, 50 Olimpiyskiy prospect, Moscow Region, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 93 - 97

The authors describe the methodology and results of dynamic field testing of the building of a universal pool under construction, as well as its eigenfrequencies, identified through the employment of a computer model.
The subject of the research represents the building of a universal pool under construction in Anapa. The general goal of this research is to identify the seismic stability of the building structure. An unbalance-type vibration machine was used in the course of the testing procedure. The machine was designed and manufactured at Moscow State University of Civil Engineering.
Identification of natural vibrations of building structures and verification of the identity of the computer model and the natural behaviour of the structure were to be completed to assess the required modes of operation of the vibration machine. Identification of full-scale dynamic characteristics was performed through the employment of the impulse method of vibration excitation.
Comparative analysis of experimental vibration frequencies and eigenfrequencies identified in the course of calculations based on different mathematical models demonstrates their similarity in terms of local shapes of vibrations, namely, in terms of buckling vibrations of an "annular" beam employed for the purpose of measurements taken in the course of the testing procedure. Frequency values identified in the course of testing and calculations vary from 4.5 to 19.8 Hz.
Calibration of the vibration machine represents another objective of the experiment. The experiment has demonstrated that the whole operating range of frequencies (2 to 15Hz) is to be employed in the course of testing procedures described above.

DOI: 10.22227/1997-0935.2012.5.93 - 97

Библиографический список
  1. Shablinskiy G.E., Isaykin A.S. Retrospektivnaya otsenka osobo otvetstvennykh sooruzheniy na osnove naturnykh dinamicheskikh issledovaniy [Retrospective Assessment of Structures of Major Importance on the basis of Dynamic Field Tests]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Construction], 1997, no. 8.
  2. Shablinskiy G.E., Zubkov D.A., Naturnye dinamicheskie issledovaniya stroitel'nykh konstruktsiy [Full-scale Dynamic Testing of Structures]. Moscow, ASV Publ., 2009.

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ASSESSMENT OF SPECTRAL DENSITY OF THE AERODYNAMIC FACTOR OF FRONT RESISTANCE

Вестник МГСУ 10/2012
  • Kir'yanova Lyudmila Vladimirovna - Moscow State University of Civil Engineering (MGSU) Candidate of Physics and Mathematics, Associate Professor, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .
  • Usmanov Anton Ravil'evich - Moscow State University of Civil Engineering (MGSU) student, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript .

Страницы 88 - 94

The subject matter of this article encompasses a detailed study of spectral density through the employment of narrow-band filters. The article is composed of the two sections. The theoretical section contains a theoretical estimation of spectral density and its theoretical substantiation. Further, we assume that the spectrum is constant. We have also made an intermediate conclusion that the estimation of spectral density will be ergodic if the two conditions are simultaneously satisfied. The strength of this method is that any estimates made on its basis are ergodic.
In the second practical part the estimations are entered into the Matlab software and applied to the aerodynamic factor of front resistance. Before the entry of estimations, statistical checks have been made. No spectral analysis is possible absent of the above checks.

DOI: 10.22227/1997-0935.2012.10.88 - 94

Библиографический список
  1. Venttsel’ E.S., Ovcharov L.A. Teoriya sluchaynykh protsessov i ee inzhenernye prilozheniya [Theory of Stochastic Processes and Its Engineering Applications]. Moscow, Vyssh. shk. publ., 2000, pp. 331—350.
  2. Bendat Dzh., Pirsol A. Prikladnoy analiz sluchaynykh dannykh [Applied Analysis of Random Data]. Moscow, Mir Publ., 1989, pp. 276—280.
  3. Liptser R.Sh., Shiryaev A.N. Statistika sluchaynykh protsessov [Statistics of Random Processes]. Moscow, Vyssh. shk. Publ., 1974, pp. 19—43.
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  5. Dzhenking G., Vatts D. Spektral’nyy analiz i ego prilozheniya [Spectral Analysis and Its Applications]. Moscow, Mir Publ., 1971, pp. 255—263.
  6. Marpl S.L. Tsifrovoy spektral’nyy analiz i ego prilozheniya [Digital Spectral Analysis and Its Applications]. Moscow, Mir Publ., 1990, pp. 146—159.
  7. Tikhonov V.I. Statisticheskaya radiotekhnika [Statistical Radio Engineering]. Radio i svyaz’ [Radio and Communications]. Moscow, 1982, no. 2, pp. 515—546.
  8. Simchera V.M. Metody mnogomernogo analiza statisticheskikh dannykh [Methods of Multivariate Statistical Analysis]. Moscow, Finansy i statistika publ., 2008, pp. 104—115.
  9. Afanas’eva I.N. Sravnitel’nyy analiz rezul’tatov chislennogo i eksperimental’nogo modelirovaniya turbulentnogo vozdushnogo potoka v zone pryamougol’noy prizmy [Comparative Analysis of Results of Numerical and Experimental Modeling of a Turbulent Air Stream in the Zone of a Rectangular Prism]. Mezhdunarodnyy zhurnal po raschetu grazhdanskikh i stroitel’nykh konstruktsiy [International Journal of Analysis of Civil and Building Structures]. 2008, no. 4, pp. 3—6.
  10. Anufriev I.E., Smirnov A.B., Smirnova E.N. MATLAB 7 [MATLAB 7]. St.Petersburg, BKhV-Peterburg Publ., 2005, pp. 241—477.

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