DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Analysis of strength of monolithic beamless floors using the limitequilibrium method

Vestnik MGSU 7/2013
  • Kuznetsov Vitaliy Sergeevich - Mytishchi Branch, Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; +7 (495) 583-07-65; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Talyzova Yulia Aleksandrovna - Mytishchi Branch, Moscow State University of Civil Engineering (MGSU) Assistant Lecturer, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, Moscow Region, 141006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 51-58

The authors present features of the strength analysis of monolithic beamless floors, obtained using the limit equilibrium method. This method consists in the following procedure: a monolithic plate bends and breaks in the limit equilibrium under a uniformly distributed load. The influence of various combinations and dimensions of column sections on bending moments are considered. The influence of cross-sectional dimensions of columns on values of effective forces is analyzed in detail. The general equation to solve the strength problems of monolithic plates, having regular grids of columns exposed to continuous uniform loads, is derived and solved by the authors. This expression can be applied to calculate the span and support moments and to establish optimal reinforcement of plates. Results of calculations are presented in graphs that make it possible to derive interesting findings.

DOI: 10.22227/1997-0935.2013.7.51-58

References
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  3. Soudki Kh., El-Sayed A.K., Vanzwolc T. Strengthening of Concrete Slab-column Connections Using CFRP Strips. Journal of King Saud University Engineering Sciences. January 2012, vol. 24, no. 1, pp. 25—33. Available at: http://www. sciencedirect.com. Date of access: Apr. 10, 2013.
  4. Zenunovica D., Folic R. Models for Behavior Analysis of Monolithic Wall and Precast or Monolithic Floor Slab Connections. Engineering Structures. July 2012, vol. 40, pp. 466—478. Available at: http://www. sciencedirect.com. Date of access: Apr. 10, 2013.
  5. Dorfman A.E., Levontin L.N. Proektirovanie bezbalochnykh beskapitel’nykh perekrytiy [Design of Beamless Cap-free Floors]. Moscow, Stroyizdat Publ., 1975, pp. 11—22, 36—46.
  6. Shtaerman M.Ya., Ivyanskiy A.M. Bezbalochnye perekrytiya [Beamless Floors]. Moscow, 1953, pp. 47—64.
  7. Zolotkov A.S. Vibratsionnye ispytaniya fragmentov monolitnykh zdaniy do razrusheniya [Vibration Testing of Fragments of Monolithic Buildings to Fracture]. Inzhenerno-stroitel’nyy zhurnal [Civil Engineering Journal]. 2012, no 1. Available at: http://www.engstroy.spb.ru. Date of access: Dec. 5, 2012.
  8. Wieczorek M. Influence of Amount and Arrangement of Reinforcement on the Mechanism of Destruction of the Corner Part of a Slab-Column Structure. Proñedia Engineering. 2013, vol. 57, pp. 1260—1268. Available at: http://www. sciencedirect.com. Date of access: Apr. 10, 2013.
  9. Malakhova A.N. Usilenie monolitnykh plit perekrytiy zdaniy stenovoy konstruktivnoy sistemy [Strengthening Monolithic Slabs of Buildings Having Wall Structural Systems]. Nauchno-prakticheskiy Internet zhurnal «Nauka. Stroitel’stvo. Obrazovanie» [Science and Practical Journal “Science, Construction, Education”]. 2012, no. 4. Available at: http://www.nso-journal.ru. Date of access: March 31, 2013.
  10. Pogrebnoy I.O., Kuznetsov V.D. Bezrigel’nyy predvaritel’no napryazhennyy karkas s ploskim perekrytiem [Beamless Pre-stressed Frame Having a Flat Slab]. Inzhenerno-stroitel’nyy zhurnal [Civil Engineering Journal]. 2010, no 3. Available at: http://www.engstroy.spb.ru. Date of access: Dec. 5, 2012.
  11. Samokhvalova E.O., Ivanov A.D. Styk kolonny s bezbalochnym beskapitel’nym perekrytiem v monolitnom zdanii [Juncture of a Column and Beamless Cap-free Floors in a Monolithic Building]. Inzhenerno-stroitel’nyy zhurnal [Civil Engineering Journal]. 2009, no 3. Available at: http://www.engstroy.spb.ru. Date of access: Dec. 5, 2012.

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EXPERIMENTAL STUDY OF THE BEARING CAPACITY OF SPATIAL METAL FRAMES

Vestnik MGSU 5/2012
  • Serpik Igor' Naftol'evich - Bryansk State Technological Academy of Engineering Doctor of Technical Sciences, Professor, Chair, Department of Mechanics, Bryansk State Technological Academy of Engineering, 3 Stanke Dimitrov Prospect, Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Alekseytsev Anatoliy Viktorovich - Bryansk State Technological University of Engineering (BSTU) Candidate of Technical Sciences, Associate Professor, Department of Construction Operations, Bryansk State Technological University of Engineering (BSTU), 3 prospekt Stanke Dimitrova, Bryansk, 241037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 40 - 44

In the article, the authors describe the principal findings of the experimental study of destruction of spatial frames made of closed-profile steel rods. Six samples of frames were tested through the application of a kinematic loading scheme. Values of forces, displacements and deformations were measured over the time. Each sample was brought to the state when the load reached its maximal value. Thereafter, the load intensity was reduced to 0.6...0.7 of its maximal value. It was identified that the destruction of rods in the event of combined stress was similar to the formation of plastic hinges in the course of regular bending. In some cases, cracks were formed in the zones of plastic hinges. This process did not cause complete destruction of frames.
Destruction-related conditions were also assessed by the quasi-rigidity method implemented in STARK ES 2009 software package. The input data were used to perform failure, bending and torsion tests of steel pipes. The experiments and calculations have proven that in this case the process of destruction can be considered in accordance with the limit equilibrium method by taking account of formation of spatial plastic hinges. The quasi-rigidity method can be employed to identify the maximal load that the frames can bear.

DOI: 10.22227/1997-0935.2012.5.40 - 44

References
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  2. Bower A.F. Applied Mechanics of Solids. New York, CRC Press, 2009, 794 р.
  3. Tin-Loi F. Plastic Limit Analysis of Flat Frames and Grids Using GAMS. Computers and Structures. 1995, vol. 54, pp. 15—25.
  4. Rutman Yu.L., Semenov V.A., Lebedev V.L. Primenenie metoda psevdozhestkostey dlya analiza predel’nykh sostoyaniy konstruktsiy [Application of the Method of Pseudo-stiffness in the Analysis of Limit States of Structures]. Stroitel’naya mekhanika i raschet sooruzheniy [Structural Mechanics and Analysis of Structures]. 2007, no. 6, pp. 68—72.
  5. Serpik I.N., Alekseytsev A.V. Raschet prostranstvennykh sterzhnevykh sistem metodom predel’nogo ravnovesiya [Calculation of Spacial Rod Systems by the Limit Equilibrium Method]. Matematicheskoe modelirovanie v mekhanike deformiruemykh tel i konstruktsiy. Metody granichnykh i konechnykh elementov. [Mathematical Modeling in Mechanics of Solids and Structures. Methods of Boundary and Finite Elements]. Proceedings of the 27th International Conference. St.Petersburg, SPBGASU [St.Petersburg State University of Architecture and Civil Engineering]. 2011, pp. 104.
  6. Serpik I.N., Alekseytsev A.V., Gusakov A.N. Ustanovka dlya ispytaniy na izgib s krucheniem sterzhnevykh obraztsov. [Stand for Bending and Torsion Testing of Sample Rods]. Pat. 2406992, RF, MPK G01N 3/20 Bull. no. 35 of 20.12.2010, 4 p.
  7. Serpik I.N., Alekseytsev A.V., Gusakov A.N. Eksperimental’no-teoreticheskie issledovaniya protsessa obrazovaniya plasticheskikh sharnirov v sterzhnyakh korobchatogo secheniya pri slozhnom soprotivlenii [Experimental and Theoretical Study of the Process of Formation of Plastic Hinges in Box Section Rods in the event of Combined Stress]. Traditsii i innovatsii v stroitel’stve [Traditions and Innovations in construction]. Proceedings of the 67th All-Russian Scientific and Technical Conference. Samara, SGASU [Samara State University of Architecture and Civil Engineering]. 2010, pp. 131—133.

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