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

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Vestnik MGSU 3/2012
  • Moiseenko Ksenija Sergeevna - Moscow State University of Civil Engineering(MSUCE) Candidate of Technical Sciences, Senior Lecturer, Department of Technology of Binders and Concretes, Moscow State University of Civil Engineering(MSUCE), 26 Yaroslavskoeshosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Voronin Viktor Valerianovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Department of Technologies of Cohesive Materials and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, 129337, Russian Federation.
  • Panchenko Aleksandr Ivanovich - Moscow State University of Civil Engineering (MSUCE) 8 (499) 287-49-14, ext. 3101, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoeshosse, Moscow, 129337, Russia.
  • Solovev Vitalij Nikolaevich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of Construction of Nuclear Plants 8(499) 188-03-03, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoeshosse, Moscow, 129337, Russia.

Pages 96 - 99

This paper covers the integrity of decorative sandwich materials; relations between relative deformations of the sandwich system and the length of contact between layers; thicknesses of the surface layer and relative deformations of the concrete base. Principles of the proposed technology are also provided in the article.
The field study of the behaviour of decorative sandwich concrete products exposed to severe conditions of operation have proven that products collapse due to cracking and peeling of the polymer concrete layer in particular cases.
Deformations of sandwich materials caused by temperature and humidity fluctuations were analyzed by strain-gauge resistance sensors placed onto the surface polymer concrete layer of a product fragment and on the concrete base in the course of their freezing. Deformations were measured at the temperature intervals of 4 to 5 degrees Celsius. Freezing represents the most severe condition.
Mathematical method of experimental planning was employed to identify the dependence between relative deformations of sandwich system Исс and length of layer-to-layer contact L, thickness of surface layer h and relative deformations of the concrete base ɛ 105.
As a result of the probabilistic and statistical processing of the experimental data a three-factor quadratic model of relative deformations of a sandwich system was generated.
This equation is used to identify the most favourable conditions to assure the integrity of a sandwich product under the combined impact of the aforementioned factors. The analysis has proven that the surface layer made of polymer concrete does not crack irrespective of the contact length if deformations of the concrete base do not exceed the limit tensibility of the surface layer. In the event of substantial deformations of the concrete base, integrity of the sandwich system is to be assured by means of the right choice of thickness and length of the surface layer.
Based on the dependence of relative deformations of the sandwich composite, made of a concrete matrix and a polymer concrete decorative and protective layer, analysis of their integrity was performed with the account for the thickness of the surface layer, contact length and relative deformations of the water saturated concrete base in the course of freezing.
Pre-set theoretical provisions were applied to develop recommendations aimed at the optimization of the composition and characteristics of the technology of production of double-layer decorative and protective products based on polymer and mineral binders.

DOI: 10.22227/1997-0935.2012.3.96 - 99

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  2. Bazhenov Ju.M. Tehnologiya betona [Technology of Concrete], Moscow, ASV, 2007.
  3. Voronin V.V. Morozostoykost’ i tehnologiya betona s modificirovannym poverhnostnym sloem [Frost Resistance and Technology of Concrete with a Modified Surface Layer]. Author’s abstract of a doctoral dissertation, Moscow, MISI im. V.V. Kuybysheva, 1985.
  4. Moiseenko K.S. Povyshenie treschinostoykosti sloistykh betonnykh izdeliy s dekorativnym polimerbetonnym zaschitnym sloem [Improvement of Fracture Resistance of Sandwich Concrete Products with a Decorative Polymer Concrete Protective Layer]. Author’s abstract of a candidate’s dissertation, Moscow, MGSU, 2011.


Phenomenological model of local plasticity

Vestnik MGSU 9/2012
  • Dolgorukov Vadim Aleksandrovich - Ryazan Institute (Branch) of Mosсow State Open University (MGOU) Candidate of Technical Sciences, Associated Professor, Chair, Department of Architecture and Urban Planning, Ryazan Institute (Branch) of Mosсow State Open University (MGOU), 26/53 Pravo-Libetskaya st., Ryazan, 390000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 101 - 108

Two points of an elastic and perfectly plastic material exposed to the plane stress are examined by the author. One point is located on the stress concentrator surface. The other one is located at a certain distance from the first one (it is considered as a secondary point within the framework of the kinetic theory of a plastic flow).
As a result of the finite element analysis of the stress-strain state it has been discovered that the material in the point located in the front area of the kinetic plastic flow remains linearly elastic in terms of its physical condition, and the load is applied to it in accordance with a curved trajectory. This trajectory is represented by




coordinates, where Uф and U0 are the density-related components of dilatation and distortion strain. For the purposes of modeling, the trajectory is represented as a two-component broken line.
As a result, the kinetic plastic flow prolongation is limited. This effect intensifies while the value of the elastic Poisson ratio (µ) goes down. For example, for ? < 0.5, dimensions of the plastic zone outstretched along the crack curve are smaller than those identified using the Irwin plastic zone solution. Furthermore, in case of ? = 0.25, the effective crack length is










, and the modified stress distribution is below the singular stress distribution according to the laws of linear elastic fracture mechanics.

DOI: 10.22227/1997-0935.2012.9.101 - 108

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