DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

The finite element method analysis of reinforced concrete structures with account for the real descriptionof the active physical processes

Vestnik MGSU 11/2013
  • Berlinov Mikhail Vasil'evich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Department of Reconstruction and Repair of Housing and Utility Objects, 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 .
  • Makarenkov Egor Aleksandrovich - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Reconstruction and Repair of Housing and Utility Objects, Moscow State University of Civil Engineering (MGSU), Moscow State University of Civil Engineering (MGSU); This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 26-33

It is well known, that buildings and their bearing structures are subject to ageing, including corrosion, deterioration, etc. When faults in bearing structure are detected, disposal-at-failure maintenance should be made. But before that, it is necessary to assess the rate of deterioration.The author suggests to use finite element method for calculation of the safety margin of reinforced concrete bearing structures, because the finite element method is widely used in engineering practice of structural design. In the process of engineering inspection of reinforced concrete structures all defects of the inspected structure should be clearly specified. The article suggests to create the FEM-Model of the inspected structure in view of the fact that this structure is defected. In order to achieve this effect, the stiffness matrix of some finite elements should be changed and the FEM-Model must be created of volumetric finite elements (the article speaks about eight-node parallelepiped elements).At first the FEM-Model will be created of eight-node parallelepiped elements with standard descriptions for the reinforced concrete; then finite elements in damage area must be changed. On the basis of integral estimation of the mode of deformation, deformation ratio will be calculated, which is essential for the description assignment of the changes in stiffness matrix. The formulation of the deformation ratio includes all the possible defects of structure through indexes, which must be analytically calculated depending on the concrete defect.The method described in the article is useful in the process of engineering inspection of the reinforced concrete structures. Using this method can sufficiently specify the safety margin of a defected structure and forecast the future operational integrity of this structure under the acting load.

DOI: 10.22227/1997-0935.2013.11.26-33

References
  1. Karpenko N.I. Obshchie modeli mekhaniki zhelezobetona [General Models of the Reinforced Concretes Mechanics]. Moscow, Stroyizdat Publ., 1996, 416 p.
  2. Karpenko N.I. Teoriya deformirovaniya zhelezobetona s treshchinami [The Theory of Deformation of the Reinforced Concrete with Cracks]. Moscow, Stroyizdat Publ., 1976, 205 p.
  3. Murashev V.I. Treshchinostoykost', zhestkost' i prochnost' zhelezobetona [Crack Strength, Stiffness and Strength of the Reinforced Concrete]. Moscow, Mashstroy-izdat Publ., 1958, 268 p.
  4. Klovanich S.F., Bezushko D.I. Metod konechnykh elementov v nelineynykh raschetakh prostranstvennykh zhelezobetonnykh konstruktsiy [The Finite Element Method for Nonlinear Analysis of Three-dimensional Reinforced Concrete Structures]. Odessa, OMNU Publ., 2009.
  5. Klovanich S.F., Balan T.A. Variant teorii plastichnosti zhelezobetona s uchetom treshchinoobrazovaniya [The Variant of the PlasticityTheory of the Reinforced Concrete Considering Crack Formation]. Priblizhennye i chislennye metody resheniya kraevykh zadach. Matematicheskie issledovaniya [Approximate and Numerical Methods of the Boundary Problems Solution. Mathematical Analysis]. Kishinev, ShTIINTsA Publ., 1988, no. 101, pp. 10—18.
  6. Singiresu S. Rao. The Finite Element Method in Engineering. Fourth edition. Elsevier Science & Technology Books, Miami, 2004.
  7. Filip C. Filippou. Finite Element Analysis of Reinforced Concrete Structures under Monotonic Loads. Structural Engineering, Mechanics and Materials. Department of Civil Engineering, University of California, Berkeley, Report No. UCB/SEMM-90/14, 1990.
  8. Larry J. Segerlind. Applied Finite Element Analysis. Second edition. John Wiley & Sons, Inc., New York, 1937.
  9. Bondarenko V.M., Bondarenko S.V. Inzhenernye metody nelineynoy teorii zhelezobetona [Engineering Methods of the Reinforced Concretes Nonlinear Theory]. Moscow, Stroyizdat Publ., 1982, 287 p.
  10. Prokopovich I.E., Ulitskiy I.I. O teoriyakh polzuchesti betonov [On the Theories of Concrete Production]. Izvestiya vuzov. Stroitel'stvo i arkhitektura [News of the Institutions of Higher Education. Building and Architecture].1963, no. 10, pp. 13—34.

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TECHNOLOGY OF EXAMINATION OF PLASTERED SURFACES OF COMPLEX ARCHITECTURAL FORMS OF BUILDING STRUCTURES USING METHODS OF GEOMETRICAL MODELING

Vestnik MGSU 11/2012
  • Tamrazyan Ashot Georgievich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, full member, Russian Engineering Academy, head of the directorate, 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 .
  • Zholobov Aleksandr Leonidovich - Astrakhan Institute of Civil Engineering (AICI) Candidate of Technical Sciences, Professor, Department of Industrial and Civil Engineering, Astrakhan Institute of Civil Engineering (AICI), 18 Tatishcheva st., Astrakhan, 414056, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ivannikova Nadezhda Aleksandrovna - Astrakhan Institute of Civil Engineering (AICI) postgraduate student, Department of Industrial and Civil Engineering, Astrakhan Institute of Civil Engineering (AICI), 18 Tatishcheva st., Astrakhan, 414056, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 125 - 130

In the course of construction and restructuring of unique buildings and structures, any architect
faces the need to design complex surfaces that have curvilinear geometrical forms that cannot be
neglected. In turn, designs with complex curvilinear geometrical forms require higher skills in their
development, as the complexity of their design and implementation is a lot higher than that of elements
that have flat surfaces.
The value of plaster cannot be underestimated. Plaster applied to surfaces of various buildings
and structures (walls, partitions, columns) flattens the surface, shapes it up and protects it from
moisture and fire; it improves resistance to heat transfer; it reduces air permeability and improves
the soundproofi ng properties of protected designs, etc.
All pre-set parameters of plaster are to constitute the subject of random inspections, and inspection
results are to be considered in the course of acceptance of any work. The most important
though hard to control parameters of plaster include:
bond strength, thickness, moisture content and density;
flatness or its radius of curvature;
deformation properties of the plaster layer versus deformation properties of the design.
Control over compliance with the design is hard to implement as curvilinear surfaces are located
at a significant height above the ground and/or the floor level. Therefore, there is a need to develop a
non-destructive method of quality assurance of construction, restructuring and finishing works.
The solution to the problem becomes possible due to development of specific hardware and
software designated for remote though accurate identification of the surface curvature.
The authors have developed a modified range-oriented laser methodology that employs angular
segments to remotely assess the flatness of the building structure and its radius of curvature and
to determine the deviation of its value from the designed one. The software also makes it possible
to implement the quality control of the work performed over the curved surfaces coated with various
types of plaster.
The proposed solutions have been pilot tested in practice, and they are ready for use in the
building industry, namely, in construction, repair and restructuring works.

DOI: 10.22227/1997-0935.2012.11.125 - 130

References
  1. TR 182—08. Tekhnicheskie rekomendatsii po nauchno-tekhnicheskomu soprovozhdeniyu i monitoringu stroitel’stva bol’sheproletnykh, vysotnykh i drugikh unikal’nykh zdaniy i sooruzheniy. [Technical Recommendations 182—08. Technical Recommendations concerning Scientific and Technical Support and Monitoring of Construction of Large-span, High-rise and Other Unique Buildings and Structures]. Moscow, GUP «NIIMosstroy» Publ., 2008, 36 p.
  2. SNiP 3.04.01—87. Izolyatsionnye i otdelochnye pokrytiya [Construction Norms and Regulations 3.04.01—87. Insulation and Finishing Coatings]. Minstroy Rossii [Ministry of Construction of Russia]. Moscow, GUP TsPP Publ., 1996, p.
  3. Tishkin D.D. Analiz eksperimental’nykh dannykh i rezul’tatov aprobatsii mekhanizirovannoy tekhnologii oshtukaturivaniya sten pomeshcheniy [Analysis of Experimental Data and Results of Testing of Technology of Power-driven Plaster Application onto Walls of Premises]. Vestnik grazhdanskikh inzhenerov [Bulletin of Civil Engineers]. 2011, no. 1, pp. 91—97.
  4. Ivannikova N.A., Zholobova O.A. Problema obespecheniya zadannogo profi lya krivolineynykh poverkhnostey trudnodostupnykh stroitel’nykh konstruktsiy [The Problem of Compliance with the Preset Pattern of Curvilinear Surfaces of Hard-to-access Structural Elements]. Materials of Scientific and Practical Conference. Stroitel’stvo-2012 [Construction’2012]. Rostov-on-Don, Rostov State University of Civil Engineering, 2012, pp. 137—138.
  5. GOST 26433.2—94. Sistema obespecheniya tochnosti geometricheskikh parametrov v stroitel’stve. Pravila vypolneniya izmereniy parametrov zdaniy i sooruzheniy. [System of Assurance of Accuracy of Geometrics in Building Engineering. Building and Structure Measurement Rules]. Moscow, Izd-vo standartov publ., 1996, 42 p.
  6. MDS 11-17.2004. Pravila obsledovaniya zdaniy, sooruzheniy i kompleksov bogosluzhebnogo I vspomogatel’nogo naznacheniya [Rules of Inspection of Buildings, Structures, Liturgic and Supplementary Facilities]. Moscow, 2005, 48 p.
  7. Rodzhers D., Adams Dzh. Matematicheskie osnovy mashinnoy grafiki [Mathematical Fundamentals of Computer Graphics]. Moscow, Mir Publ., 2001, 604 p.

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