VIBRATIONS OF A DEEP HEAVY FOUNDATION RESTING ON WEIGHTY MULTILAYER SOILS

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 .
  • Jaro Mokhammed Nazeem - Moscow State University of Civil Engineering (MSUCE) postgraduate student, Department of Soil Mechanics, Beddings and Foundations, 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 116 - 120

The authors present analytical and numerical solutions to the problem of vibrations of deep foundations caused by dynamic loads, if the foundations rest on multilayer soils. It is proven that the friction force that influences the foundation, the weighty nature of the bedding, and the visco-elastic properties of soils affect the amplitude and the frequency of vibrations.
The authors present an approach to the calculation of vibrations of deep foundations resting on multilayer soils. The proposed approach takes account of the side surface friction of the foundation and the soil and elastic and viscous properties of soils. The soil is presented as a multilayer substance, and all of its layers are connected to one another by elastic-viscous elements. In this case, each layer of soil vibrates independently and provides multiple degrees of freedom to the system.
A mathematical description of vibrations requires the identification of the coefficient of stiffness for each layer of soil, as well as the weight, the average per-layer stress and the angle of distributed static stress.
The results have proven that the weight of the bedding, the friction of a deep foundation, and elastic and viscous properties of soil affect the behavior of the amplitude and the frequency of foundation vibrations and the accumulation of residual settlements.

DOI: 10.22227/1997-0935.2012.4.116 - 120

References
  1. Voznesenskiy E.A. Dinamicheskaya neustoychivost' gruntov [Dynamic Instability of Soils]. Moscow, Editorial Publ., 1999, 264 p.
  2. Krasnikov N.D. Dinamicheskie svoystva gruntov i metody ikh opredeleniya [Dynamic Properties of Soils and Methods of Their Identification]. Leningrad, Stroyizdat Publ., 1970, 239 p.
  3. Savinov O.A. Sovremennye konstrukyii fundamentov pod mashiny i ikh raschet [Modern Structures of Foundations to Accommodate Machinery and Analysis of Structures]. Leningrad – Moscow, Stroyizdat Publ., 1974, 279 p.
  4. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 552 p.
  5. Ukhov S.B., Semenov V.V, Znamenskiy V.V., Ter-Martirosyan Z.G., Chernyshev S.H. Mekhanika gruntov. Osnovaniya i fundamenty [Soil Mechanics. Beddings and Foundations], 2007, 561 p.
  6. Braja M. DA. Fundamentals of Soil Dynamics, ed. ELSEVIER, New York, Amsterdam, Oxford, 1983, p. 399.

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DURABILITY OF THREE-LAYERED WALLS WITH BRICK FACING THAT PROVIDES HIGH THERMAL PROTECTION

Vestnik MGSU 1/2013
  • Umnyakova Nina Pavlovna - Scientific and Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (NIISF RAASN) +7 (495) 482-39-67, Scientific and Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (NIISF RAASN), 21 Lokomotivnyy proezd, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 94-100

The author examines possible reasons for the fracturing of external three – layered walls that have an efficient insulation of the thickness of 120 — 150 mm. The external wall layer is made of bricks. A comparative analysis of the temperature distribution inside the walls has demonstrated that the full-depth frost penetration into the brick facing of the wall that has 120 mm insulation occurs when the outside temperature is below –1 °C. However, the same effect occurs when the outside temperature is below –3 °C in respect of walls that have 50 mm insulation.If the average monthly temperature pattern, particularly the autumn one, is taken into consideration, in the event of the average November temperature of –2.2 °C the chance of full — depth wall freezing is higher if the insulation layer is thicker, and lower, if the insulation layer is 50 mm thick. The analysis of average monthly temperatures and ranges of their fluctuations has revealed that full-depth wall freezing lasts for 6 months, if the insulation layer is 120 mm thick, and if the insulation layer is thinner, the effect lasts only for 4 months. These calculations have proven that the thicker the insulation, the higher the temperature deformations and temperature stresses within the outside brick layer. These effects accelerate the fracturing of three — layered walls.

DOI: 10.22227/1997-0935.2013.1.94-100

References
  1. SNiP II-3—79*. Stroitel’naya teplotekhnika [Construction Norms and Rules II-3—79*. Heat Engineering in Construction]. Moscow, Gosstroy SSSR Publ., 1985.
  2. SNiP 23-02—2003. Teplovaya zashchita zdaniy [Construction Norms and Rules 23-02—2003. Thermal Protection of Buildings]. Moscow, Gosstroy SSSR Publ., 2004, 26 p.
  3. Shubin I.L., Umnyakova N.P. Aktualizirovannye stroitel’nye normy po zashchite ot shuma, estestvennomu i iskusstvennomu osveshcheniyu i teplovoy zashchite zdaniy, razrabotannye NIISF RAASN [Revised Construction Norms Applicable to Noise Protection, Natural and Artificial Illumination and Thermal Protection of Buildings Developed by Scientific and Research Institute of Building Physics of RAACS]. Materialy mezhdunarodnoy konferentsii «Sovremennye innovatsionnye tekhnologii izyskaniy, proektirovaniya i stroitel’stva v usloviyakh Kraynego Severa [Works of International Conference on Advanced Innovative Technologies of Surveying, Design and Construction in the Far North]. Yakutsk, 8—10 August, 2012, pp. 40—54.
  4. Fokin K.F. Stroitel’naya teplotekhnika ograzhdayushchikh chastey zdaniy [Heat Engineering of Envelope Elements of Buildings]. Moscow, 2006, 256 p.
  5. SNiP 23-01—99. Stroitel’naya klimatologiya [Construction Norms and Rules 23-01—99. Construction Climatology]. Moscow, 2011, 94 p.
  6. SNiP 2.01.01—82. Stroitel’naya klimatologiya i geofi zika. [Construction Norms and Rules 2.01.01—82. Construction Climatology and Geophysics]. Moscow, Gosstroy SSSR Publ., 1983, 136 p.
  7. Umnyakova N.P. Vliyanie temperaturnykh kolebaniy naruzhnogo vozdukha na obrazovanie kondensata v vozdushnoy prosloyke ventiliruemykh fasadov [Infl uence of Temperature Fluctuations of the Outside Air onto Formation of Condensate within the Air Space of Ventilated Facades]. Stroitel’nye materialy, oborudovanie i tekhnologii XXI veka [Construction Materials, Machinery and Technologies of the 21st Century]. 2004, no. 7, pp. 65—67.
  8. Umnyakova N.P. Vozvedenie energoeffektivnykh zdaniy v tselyakh umen’sheniya negativnogo vozdeystviya na okruzhayushchuyu sredu [Erection of Energy Efficient Buildings with a View to Reduction of the Negative Impact onto the Environment]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 3, vol. 2, pp. 459—464.
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