DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Features of the effect of dynamic loading produced on the concrete behavior at different stages of deformation caused by uniaxialand biaxial compression

Vestnik MGSU 7/2013
  • Tsvetkov Konstantin Aleksandrovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Strength of Materials; +7 (499) 183-43-29, 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 .
  • Mitrokhina Anastasiya Olegovna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Strength of Materials; +7 (499) 183-43-29, 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 .

Pages 77-85

The authors examine the impact of dynamic loads produced on the strength and deformability properties of concretes and their micro-cracking. The experiment performed and analyzed by the authors consisted in the dynamic loading of a concrete sample that caused its destruction. The analysis of the experimental findings consisted in the identification of specific conditions of cracking, derivation of dependencies and compilation of charts. The following conclusions are made in furtherance of the authors’ analysis of the experiment in question:1) experimental findings help identify the nature of influence of the stress state on the strength value, deformability and micro-cracking of concretes. For example, it is discovered in the process of the experiments that the lower bound of the microracking dynamics increases more significantly than the prism strength.2) Regularities of influence of the rise in the loading intensity produced on concrete deformation properties are identified. The key factor of the concrete destruction is not the nature of the deformation, but the value of the overall strain.

DOI: 10.22227/1997-0935.2013.7.77-85

References
  1. Karpenko N.I. Obshchie modeli mekhaniki zhelezobetona [General Models of Reinforced Concrete Mechanics]. Moscow, Stroyizdat Publ., 1996.
  2. Tsvetkov K.A. Osnovnye rezul’taty eksperimental’no-teoreticheskikh issledovaniy prochnostnykh i deformativnykh svoystv betona pri dinamicheskom nagruzhenii v usloviyakh odnoosnogo i dvukhosnogo szhatiya [Principal Findings of Theoretical and Experimental Research into Strength and Deformability-related Properties of Concrete Exposed to Dynamic Loading in the Conditions of Uniaxial and Biaxial Compression]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2007, no. 3, pp. 109—120.
  3. Malashkin Yu.N., Ish V.G. Beton v dvukhosnom napryazhennom sostoyanii «rastyazhenie-szhatie» [Concrete in the Biaxial Stress State of “Tension-Compression”. In the book: Issledovanie monolitnosti i raboty betona massivnykh sooruzheniy [Research into Integrity and Behaviour of the Concrete of Massive Concrete Structures]. Moscow, MISI Publ., 1975, pp. 120—130.
  4. Bakirov R.O., Emyshev M.V., Maystrenko V.N. Vliyanie skorosti nagruzheniya na granitsy mikrotreshchinoobrazovaniya vysokoprochnykh betonov [Influence of Loading Rate onto Micro-cracking Bounds of High-strength Concretes]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 1982, no. 9, pp. 32—33.
  5. Rakhmanov V.A., Rozovskiy E.L. Vliyanie dinamicheskogo vozdeystviya na prochnostnye i deformativnye svoystva tyazhelogo betona [Influence of Dynamic Impacts on Strength and Deformability Properties of Heavy Concretes]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 1987, no. 7, pp. 19—20.
  6. Bazhenov Yu.M. Beton pri dinamicheskom nagruzhenii [Concrete Exposed to Dynamic Loading]. Moscow, Stroyizdat Publ.,1971, 271 p.
  7. Rykov G.V., Obledov V.P., Mayorov E.Yu., Abramkina V.T. Eksperimental’nye issledovaniya protsessov deformirovaniya i razrusheniya betonov pri intensivnykh dinamicheskikh nagruzkakh [Experimental Research into Processes of Deformation and Destruction of Concretes Exposed to Intensive Dynamic Loads]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Analysis of Structures]. 1989, no. 5, pp. 54—59.
  8. Ross C.A., Tedesco J.W., Kuennen S.T. Effects of Strain Rate on Concrete Strength. Materials Journal, January 1, 1995, pp. 37—47.
  9. Zielinski A.J. Concrete Structures under Impact Loading. Rate effects. Internal Report. Delft University of Technology, Faculty Civil Engineering and Geosciences, 1984, pp. 12—31.

Download

Stress-strain properties of concrete made of the chip of crushed concrete

Vestnik MGSU 10/2016
  • Bezgodov Igor’ Mikhaylovich - Moscow State University of Civil Engineering (National Research University) (MGSU) research worker, 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 .
  • Pakhratdinov Alpamys Abdirashitovich - Moscow State University of Civil Engineering (National Research University) (MGSU) postgraduate student, Department of Construction Materials, 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 .
  • Tkach Evgeniya Vladimirovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Sciences, Professor, Department of Construction Materials, 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 24-34

The use of crushed concrete scrap, the volume of which is quite essential, is constrained by the regulatory framework and poor studies of stress-strain characteristics of concrete. In order to solve this problem it is necessary to conduct comparative experiments with the aim of obtaining the strength and deformation characteristics of concrete, which will allow determining the possible list of structures for industrial and civil objects. Tests were carried out on the assessment of prism strength, modulus of elasticity, coefficient of lateral deformation, the maximum compression strain, tensile strength in bending as well as tests of reinforced concrete beams produced of the same compositions for evaluation of failure load, strain and deflection diagram construction with the aim of identifying distinctive characteristics of strength and deformation characteristics of concrete obtained of crushed concrete waste in comparison with the characteristics of concrete made of granite macadam. The results of the investigation show that the use of crushed concrete waste in reinforced concrete structures is quite allowable and there is no need in serious adjustments in the calculations, especially for concretes of low grades.

DOI: 10.22227/1997-0935.2016.10.24-34

Download

IDENTIFICATION OF THICKNESS OF A COMPOSITE MATERIAL AS PART OF THE QM GLUED CONNECTION OF WOODEN ELEMENTS

Vestnik MGSU 8/2012
  • Linkov Nikolay Vladimirovich - Moscow State University of Civil Engineering Candidate of Technical Sciences, Department of Timber and Plastic Structures 8 (495) 287-49-14, ext. 31-11, Moscow State University of Civil Engineering, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 125 - 130

The principal objective of the research project is to identify the thickness of an advanced
composite adhesive material used as part of a glued connection of wooden surfaces. The active
ingredients of the proposed adhesive material include an epoxy matrix and a glass fiber fabric. The
author has analyzed the bearing capacity and deformability of the proposed connection in relation
to the thickness of the composite material. The author used the methodology of assessment of the
bearing capacity of wooden structures developed by professor Yu.M. Ivanov. For the purposes of
development of optimal parameters of the "QM Glued" connection, the author identified the optimal
ratio of b, or width of the surface of connected elements, and the thickness of the composite material:
t = 1/40 b.

DOI: 10.22227/1997-0935.2012.8.125 - 130

References
  1. Lin’kov N.V. Nesushchaya sposobnost’ derevyannykh balok sostavnogo secheniya na soedinenii «KM-Vkladysh» [Bearing Capacity of Composite Sections of Wooden Beams If Connected Using the “CM-Liner” Method]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 1, pp.161—167.
  2. Shilin A.A., Pshenichnyy V.A., Kartuzov D.V. Usilenie zhelezobetonnykh konstruktsiy kompozitsionnymi materialami [Strengthening of Reinforced Concrete Structures by Composite Materials]. Moscow, Stroyizdat Publ., 2004.
  3. Shilin A.A., Pshenichnyy V.A., Kartuzov D.V. Vneshnee armirovanie zhelezobetonnykh konstruktsiy kompozitsionnymi materialami [Outside Reinforcement of Reinforced Structures by Composite Materials]. Moscow, Stroyizdat Publ., 2007.
  4. Blaschko M. and Zilch K. Rehabilitation of Concrete Structures with CFRP Strips Glued into Slits. Proceedings of the 12th International Conference on Composite Materials. Paris, 1999, July 5-9.
  5. Arduini M., Nanni A., Romagnolo M. Performance of Decommissioned Reinforced Concrete Girders Strengthened with Fiber-reinforced Polymer Laminates. ACI Structural Journal. September-October, 2002, pp. 652—659.
  6. Vasil’ev V.V., Protasov V.D., Bolotin. Vasil’ev V.V., Tarnopol’skiy Yu.M., editors. Kompozitsionnie materialy [Composite Materials]. Moscow, Mashinostroenie Publ., 1990.
  7. Rekomendatsii po ispytaniyu soedineniy derevyannykh konstruktsiy [Recommendations for the Testing of Connections of Wooden Structures]. Moscow, Stroyizdat Publ., 1980.
  8. Blaschko M., Niedermeier R., Zilch K. Saadatmanesh H. and Ehsani, M.R., editors. Bond Failure Modes of Flexural Members Strengthened with FRP. Proceedings of Second International Conference on Composites in Infrastructures, Tucson, Arizona, 1998, pp. 315—327.
  9. Lin’kov, N.V., Filimonov E.V. Modelirovanie sredstvami PK SCAD soedineniya derevyannykh elementov kompozitsionnym materialom na osnove epoksidnoy matritsy i steklotkani [Modeling of Wooden Elements Connected by a Composite Material Based on Epoxy Matrix and Fiberglass Using PC SCAD Software]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2009, Special Issue no. 1, pp. 50—53.
  10. Lin’kov N.V., Filimonov E.V. Prochnost’ i deformativnost’ kompozitsionnogo materiala na osnove epoksidnoy matritsy i steklotkani [Strength and Deformability of the Composite Material Based on the Epoxy Matrix and Fiberglass]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 1, pp. 235—243.

Download

Results 1 - 3 of 3