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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
  1. Timoshenko S.P., Voynovskiy-Kriger S. Plastinki i obolochki [Plates and Shells] Moscow, 1959, pp. 274—283.
  2. Nikonorov S.V., Tarasova O.A. Tekhnologiya rannego nagruzheniya monolitnykh perekrytiy pri ispol’zovanii balochno-stoechnoy opalubki [Technology of Early Loading of Monolithic Slabs Using Rack-girder Formwork]. Inzhenerno-stroitel’nyy zhurnal [Civil Engineering Journal]. 2010, no. 4. Available at: http://www.engstroy.spb.ru. Date of access: Dec. 5, 2012.
  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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Features of monolithic beam floor operation under load

Vestnik MGSU 11/2013
  • Malakhova Anna Nikolaevna - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Architectural and Structural Design, Department of Reinforced Concrete 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 50-57

The article deals with a monolithic floor in the form of a solid slab with intercolumn beams arranged in two directions, with cell dimensions 5,7×8,0 m. The article presents a constructive solution: floor slab having a thickness (h) 200 mm is based on contour beam cross-section with the dimensions of 300×500 (b×h) mm. The reinforcement of structural elements of a slab is shown.The results of simplified floor slab calculation in the elastic stage and by limit equilibrium method are presented. The simplification of the floor calculation due to the separate calculation of beams (the main supporting structure of the floor) and slabs, supported by a system of beams, is offered. It is considered that slabs are firmly fastened on four sides with no displacement of supports.Also the results of computer calculation of monolithic beam floors are presented, which take into account the operation of structural elements of the floor. In the process of computer calculation of monolithic beam floor the slab was modeled by plate members and floor beams — by axial elements.The author gives a comparative analysis of the results of simplified calculations and computer calculations of a monolithic beam floor made on the basis of the final stress distribution in the slab. Special features of a monolithic beam slab under the load depend on the parameters of stiffness of contour floor beams.

DOI: 10.22227/1997-0935.2013.11.50-57

References
  1. Tamrazyan A.G. O vliyanii snizheniya zhestkosti zhelezobetonnykh plit perekrytiy na nesushchuyu sposobnost' pri dlitel'nom deystvii nagruzki [On the Influence of Reducing the Stiffness of Reinforced Concrete Floor Slabs on their Bearing Capacity under Long-term Load]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2012, no. 7, pp. 30—32.
  2. Yarov V.A., Koyankin A.A., Skripal'shchikov K.V. Eksperimental'nye issledovaniya uchastka monolitnogo perekrytiya mnogoetazhnogo zdaniya [Experimental Investigations of a Section of the Monolithic Floor of a Multi-storey Building]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2009, no. 3, pp.150—153.
  3. Potapov Yu.B., Vasil'ev A.V., Fedorov I.V., Vasil'ev V.P. Zhelezobetonnye perekrytiya s plitoy, opertoy po konturu [Reinforced Concrete Floors with a Slab Supported on a Contour]. Promyshlennoe i grazhdanskoe stroitel'stvo [Industrial and Civil Engineering]. 2009, no. 3, pp. 40—41.
  4. Russo G., Pauletta M.. Seismic Behavior of Exterior Beam-Column Connections with Plain Bars and Effects of Upgrade. ACI Structural Journal. 2012, March, vol. 109, no. 2, pp. 225—233.
  5. Lips S., Ruiz M.F., Muttoni A.. Experimental Investigation on Punching Strength and Deformation Capacity of Shear-Reinforced Slabs. ACI Structural Journal. 2012, November, vol. 109, no.6, pp. 889—900.
  6. Torsten Welsch, Markus Held. Zur Geschichte der Stahlbetonflachdecke. Beton- und Stahlbetonbau. 2012, vol. 107, no. 2, pp. 106—115.

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