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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Plastic deformation and fracture of masonry under biaxial stresses

Vestnik MGSU 2/2016
  • Kabantsev Oleg Vasil’evich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Professor, Department of Reinforced Concrete and Masonry Structures, 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 34-48

Masonry is a complex multicomponent composite composed of dissimilar materials (brick / stone and mortar). The process of masonry deformation under load depends on the mechanical characteristics of the basic composite materials, as well as of the parameters belonging to the elements, which define the link between brick and mortar being the structural elements. The paper provides an analysis of the experimental study results of masonry behaviour in two-dimensional stress state at primary stresses of opposite signs; identifies the mechanisms of masonry failure that are in compliance with the conditions of stress state. The work shows the key role that structural elements play in the formation of masonry failure processes. On the basis of failure mechanisms educed from the experiments, there was developed a discrete model of masonry. The processes and the corresponding strength criteria, which play a key role in the implementation of plastic deformation phase, have been detected. It has been shown that the plastic deformation of masonry under biaxial stresses occurs in case of the physical linear behavior of the basic materials (brick and mortar). It has been also substantiated that the plastic properties of masonry under biaxial stresses are determined by the processes occurring at the contact interaction nodes between brick and mortar in bed and cross joints. The values of the plasticity coefficients for masonry depending on the mechanical properties of a brick, a mortar and adhesive strength in their interaction have been obtained basing on the results of the performed numerical investigations.

DOI: 10.22227/1997-0935.2016.2.34-48

References
  1. Geniev G.A. O kriterii prochnosti kamennoy kladki pri ploskom napryazhennom sostoyanii [On the Strength Criteria of Masonry with Plane Stress State]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Analysis of Constructions]. 1979, no. 2, pp. 7—11. (In Russian)
  2. Tyupin G.A. Deformatsionnaya teoriya plastichnosti kamennoy kladki [Deformational Theory of Masonry Plasticity]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Analysis of Constructions]. 1980, no. 6, pp. 28—30. (In Russian)
  3. Polyakov S.V., Safargaliev S.M. Monolitnost’ kamennoy kladki [Monolithic Masonry]. Alma-Ata, Gylym, 1991, 160 p. (In Russian)
  4. Kashevarova G.G., Ivanov M.L. Naturnye i chislennye eksperimenty, napravlennye na postroenie zavisimosti napryazheniy ot deformatsiy kirpichnoy kladki [Full-scale and Numerical Experiments to Create the Dependencies of Stresses from Masonry Deformations]. Privolzhskiy nauchnyy vestnik [Volga Region Scientific Proceedings]. 2012, no. 8, pp. 10—15. (In Russian)
  5. Kashevarova G.G., Zobacheva A.Yu. Modelirovanie protsessa razrusheniya kirpichnoy kladki [Modeling the Fracture Process of Masonry]. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Stroitel’stvo i arkhitektura [Perm National Research Polytechnic University Bulletin. Construction and Architecture]. 2010, no. 1, pp. 106—116. (In Russian)
  6. Grishchenko A.I., Semenov A.S., Semenov S.G., Melnikov B.E. Influence of Structural Parameters of the Masonry on Effective Elastic Properties and Strength. Inzhenerno-stroitel’nyy zhurnal [Magazine of Civil Engineering]. 2014, no. 5, pp. 95—106. (In Russian)
  7. Derkach V.N. Anizotropiya prochnosti na rastyazhenie kamennoy kladki pri raskalyvanii [Anisotropy of Tensile Strength of Masonry in Case of Cleaving]. Nauchno- tekhnicheskie vedomosti SPbGPU [St. Petersburg State Polytechnical University Journal]. 2012, no. 147-2, pp. 259—265. (In Russian)
  8. Schubert P., Bohene D. Schubfestigkeit von Mauerwerk aus Leichtbetonsteinen. Das Mauerwerk. Ernst & John, 2002, vol. 6, no. 3, pp. 98—102.
  9. Capozucca R. Shear Behaviour of Historic Masonry Made of Clay Dricks. The Open Construction and Building Technology Journal. 2011, no. 5. (Suppl 1-M6), pp. 89—96. DOI: http://dx.doi.org/10.2174/1874836801105010089.
  10. Sousa R., Sousa H., Guedes J. Diagonal Compressive Strength of Masonry Samples — Experimental and Numerical Approach. Materials and Structures. 2013, vol. 46, pp. 765—786. DOI: http://dx.doi.org/10.1617/s11527-012-9933-z.
  11. Calio I., Marletta M., Panto B. A New Discrete Element Model for the Evaluation of the Seismic Behaviour of Unreinforced Masonry Buildings. Engineering Structures. 2012, no. 40, pp. 327—338. DOI: http://dx.doi.org/10.1016/j.engstruct.2012.02.039.
  12. Mohebkhah A., Tasnimi A.A. Distinct Element Modeling of Masonry-Infilled Steel Frames with Openings. The Open Construction and Building Technology Journal. 2012, no. 6 (Suppl 1-M2), pp. 42—49. DOI: http://dx.doi.org/10.2174/1874836801206010042.
  13. Kabantsev O.V. Diskretnaya model’ kamennoy kladki v usloviyakh dvukhosnogo napryazhennogo sostoyaniya [Discrete Model of Masonry under Biaxial Stresses]. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel’nogo universiteta [Vestnik Tomsk State University of Architecture and Building]. 2015, no. 4 (51), pp. 113—134. (In Russian)
  14. Kabantsev O.V., Tamrazyan A.G. Modelirovanie uprugo-plasticheskogo deformirovaniya kamennoy kladki v usloviyakh dvukhosnogo napryazhennogo sostoyaniya [Modeling Elastoplastic Deformation of Masonry under Biaxial Stresses]. International Journal for Computational Civil and Structural Engineering. 2015, no. 3, vol. 11, pp. 87—100. (In Russian)
  15. Vil’deman V.E., Sokolkin Yu.V., Tashkinov A.A. Mekhanika neuprugogo deformirovaniya i razrusheniya kompozitsionnykh materialov [Mechanics of Inelastic Deformation and Destruction of Composite Materials]. Moscow, Nauka. Fizmatlit Publ., 1997, 288 p. (In Russian)
  16. Burago N.G. Modelirovanie razrusheniya uprugoplasticheskikh tel [Modelling of Elastoplastic Bodies Destruction]. Vychislitel’naya mekhanika sploshnykh sred [Computational Continuum Mechanics]. 2008, vol. 1, no. 4, pp. 5—20. (In Russian)
  17. Trusov P.V. Nekotorye voprosy nelineynoy mekhaniki deformiruemogo tverdogo tela (v poryadke obsuzhdeniya) [Some Problems of Nonlinear Mechanics of Solids (In the Form of Discussion)]. Vestnik Permskogo natsional’nogo issledovatel’skogo politekhnicheskogo universiteta. Mekhanika [Perm National Research Polytechnic University Bulletin. Mechanics]. 2009, Vol. 17, pp. 85—95. (In Russian)
  18. Kabantsev O.V., Karpilovskiy V.S., Kriksunov E.Z., Perel’muter A.V. Tekhnologiya raschetnogo prognoza napryazhenno-deformirovannogo sostoyaniya konstruktsiy s uchetom istorii vozvedeniya, nagruzheniya i deformirovaniya [Technology of Computational Prediction of Stress-Strain State of Constructions Taking into Account the History of Erecting, Loading and Deformation]. International Journal for Computational Civil and Structural Engineering. 2011, no. 3, vol. 7, pp. 110—117. (In Russian)
  19. Kopanitsa D.G., Kabantsev O.V., Useinov E.S. Eksperimental’nye issledovaniya fragmentov kirpichnoy kladki na deystvie staticheskoy i dinamicheskoy nagruzki [Experimental Researches of Masonry Fragments on the Effect of Static and Dynamic Loads]. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel’nogo universiteta [Vestnik Tomsk State University of Architecture and Building]. 2012, no. 4, pp. 157—178. (In Russian)
  20. Il’yushin A.A. Mekhanika sploshnoy sredy [Continuum Mechanics]. Moscow, Izdatel’stvo Moskovskogo universiteta Publ., 1978, 287 p. (In Russian)
  21. Parton V.Z., Morozov E.M. Mekhanika uprugoplasticheskogo razrusheniya. Osnovy mekhaniki razrusheniya [Mechanics of Elastic-Plastic Destruction. Fundamentals of Destruction Mechanics]. 3rd edition, revised. Moscow, LKI Publ., 2008, 352 p. (In Russian)
  22. Sokolov B.S., Antakov A.B. Rezul’taty issledovaniy kamennykh i armokamennykh kladok [The Results of Masonry and Reinforced Masonry Research]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2014, no. 3, pp. 99—106. (In Russian)
  23. Tonkikh G.P., Kabantsev O.V., Simakov O.A., Simakov A.B., Baev S.M., Panfilov P.S. Eksperimental’nye issledovaniya seysmousileniya kamennoy kladki naruzhnymi betonnymi applikatsiyami [Experimental Researches of Seismic Reinforcement of Masonry by Exterior Concrete Applications]. Seysmostoykoe stroitel’stvo. Bezopasnost’ sooruzheniy [Earthquake Engineering. Constructions Safety]. 2011, no. 2, pp. 35—41. (In Russian)
  24. Pangaev V.V., Albaut G.I., Fedorov A.V., Tabanyukhova M.V. Model’nye issledovaniya napryazhenno-deformirovannogo sostoyaniya kamennoy kladki pri szhatii [Model Research of the Stress-Strain State of Masonry in Case of Compression]. Izvestiya vysshikh uchebnykh zavedeniy. Stroitel’stvo [News of Higher Educational Institutions. Construction]. 2003, no. 2, pp. 24—29. (In Russian)
  25. Kabantsev O.V. Deformatsionnye svoystva kamennoy kladki kak raznomodul’noy kusochno-odnorodnoy sredy [Deformation Properties of Masonry as the Multimodulus Piecewise Homogeneous Continua]. Seysmostoykoe stroitel’stvo. Bezopasnost’ sooruzheniy [Earthquake Engineering. Constructions Safety]. 2013, no. 4, pp. 36—40. (In Russian)
  26. Popov N.N., Rastorguev B.S. Dinamicheskiy raschet zhelezobetonnykh konstruktsiy [Dynamic Calculation of Reinforced Concrete Constructions]. Moscow, SI Publ., 1974, 207 p. (In Russian)
  27. Karpilovskiy V.S., Kriksunov E.Z., Malyarenko A.A., Mikitarenko M.A., Perel’muter A.V., Perel’muter M.A. SCAD Office. Versiya 21. Vychislitel’nyy kompleks SCAD++ [SCAD Office. Version 21. Computer Complex SCAD++]. Moscow, SKAD SOFT Publ., 2015, 808 p. (In Russian)

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RESEARCH OF FORMATION OF THE PORE STRUCTURE OF CEMENT SYSTEMS THAT HARDEN AT LOW AND NEGATIVE TEMPERATURES

Vestnik MGSU 3/2012
  • Pashkevich Stanislav Aleksandrovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, head, Laboratory of Climatic Tests, Scientific and Research Institute of Construction Materials and Technologies, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (495) 656-14-66; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Pustovgar Andrey Petrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, assistant professor, Vice Rector for Research, scientific director of the Research Institute of Building Materials and Technologies (SRI SMiT), Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Adamtsevich Aleksey Olegovich - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, senior research worker of Head of the Department of Scientific Policy, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Golunov Sergey Anatolevich - Moscow State University of Civil Engineering (MSUCE) Deputy Director, Scientific and Research Institute of New Building Materials and Technologies (NII «SMiT»), Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Shishiyanu Natalya Nikolaevna - Moscow State University of Civil Engineering (MSUCE) master student, Department of Construction of Nuclear Power Plants, Junior Researcher, Scientific and Research Institute of New Building Materials and Technologies (NII «SMiT»), Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 120 - 125

The article covers the formation of the pore structure of cement systems that harden at low and negative temperatures. Temperature fluctuations that accompany the hydration of cement systems can produce a substantial impact onto the chemical activity of the water in the course of hydration. These factors can produce an adverse impact on the formation of the structure of the cement stone and impair its performance characteristics. The formation of the structure of cement systems is dependent on the impact of specialized additives, including antifreeze agents that facilitate hydration at low and negative temperatures. The research of their action and the nature of their influence on the formation of the microstructure of the cement stone facilitate the purposeful adjustment of their properties. Therefore, modification of cement systems by specialized antifreeze components is a relevant objective of scientific and practical research.
Research of a classical cement system (a benchmark composition) and a cement system modified by a specialized antifreeze polymer-based additive (a modified composition) was performed to identify the impact of antifreeze additives onto the process of formation of its pore space.
Upon completion of the research project described in the article, the authors have concluded that antifreeze additives facilitate hydration of cement at low and negative temperatures and cause regular formation of the pore structure of the cement stone.

DOI: 10.22227/1997-0935.2012.3.120 - 125

References
  1. Bazhenov Yu.M. Sposoby opredeleniya sostava betona razlichnykh vidov [Methods of identification of Composition of Various Types of Concrete]. Moscow, Stroyizdat, 1975.
  2. Usherov-Marshak A.V., Sopov V.P., Zlatkovskiy O.A. Fiziko-khimicheskie osnovy vliyaniya moroza na tverdenie betona [Physical and Chemical Principles Underlying the Influence of Frost onto Concrete Hardening], Naukovo-praktichni problemi suchasnogo zalizo bstona, no. 50, K, NDIBK, 1999, pp. 391—394.
  3. Rukovodstvo po primeneniyu khimicheskikh dobavok v betone [Guide to the Use of Chemical Additives to the Concrete], NIIZhBGosstroya SSSR, Moscow, Stroyizdat, 1980.

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