DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Constructive solutions for beamless capitalless floors with prestressed reinforcement

Vestnik MGSU 6/2014
  • Bardysheva Yuliya Anatol'evna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, 141006, Moscow Region, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kuznetsov Vitaliy Sergeevich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Senior Research Worker, Department of Architectural and Construction Design, Mytishchi Branch, Moscow State University of Civil Engineering (MGSU), 50 Olimpiyskiy prospect, Mytishchi, 141006, Moscow Region, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Talyzova Yuliya Aleksandrovna - Moscow State University of Civil Engineering (MGSU) Assistant, Department of Architectural and Structural 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 44-51

In the article the authors present advanced constructions of prestressed reinforced concrete flat ceiling, where high-strength ropes in elastic shell are used as stressed reinforcement. The novelty of the solution lays in diagonal arrangement of hard valves and use of high-strength ropes in a flexible shell of "Monostrand" type. This type of prestress, in our opinion, is the most acceptable from technical point of view for selective reinforcement of separate tense rods or cables. The use of pre-stressed reinforcement in the form of individual rods or cables increases the rigidity and crack resistance of concrete beamless slabs. The use of high-strength ropes in the monostrand-type shell makes it possible to prestress in frames of single cell plate or floor in general and to reduce labour input for stressing armature. The paper presents original solution with diagonal position of the valve. The authors suggest the use of prestressed diagonal valves as in all cells of the floor with the cells of the same or only slightly different size and in separate cells of the floor (for roofs with different cells). The diagonal location of stressed reinforcement proposed in the work is an efficient solution for extending the range of dimensions and loads size.

DOI: 10.22227/1997-0935.2014.6.44-51

References
  1. Chernygov E.A. Issledovanie effektivnosti primeneniya tekhnologii natyazheniya armatury na beton bez stsepleniya [Efficiency Study of the Use of Post-Tensioning Technology without Bond]. Molodye uchennye v transportnoy nauke: nauchnye trudy [Young Scientists in Transport Science: Scientific Works]. Moscow, OAO TsNIIS Publ., 2005, pp. 87—95.
  2. Citnikov S.L., Miryushenko E.F. Sposob izgotovleniya predvaritel'no napryazhennykh zhelezobetonnykh konstruktsiy i monostrend [Production Method of Prestressed Reinforced Concrete Structures and Monostrand]. Patent RF № 2427686. № 2009132979/03; zayavl. 02.09.2009; opubl. 27.08.2011, Byul. № 24 [Russian Patent no. 427686. No. 2009132979/03; subm. 02.09.2009; published 27.08.2011, Bull. No. 24]. 8 p.
  3. Zaytsev Yu.V. Modelirovanie deformatsiy i prochnosti betona metodami mekhaniki razrusheniy [Concrete Deformation and Strength Modeling by Means of Fracture Mechanics]. Moscow, Stroyizdat Publ., 1982, 196 p.
  4. Gagin A.A. Osobennosti bezbalochnykh bol'sheproletnykh monolitnykh zhelezobetonnykh perekrytiy [Features of Beamless Longspan Monolithic Reinforced Concrete Slabs]. Vestnik RUDN. Seriya: Inzhenernye issledovaniya [Proceedings of Peoples’ Friendship University of Russia. Series: Engineering Investigations]. 2010, no. 2, pp. 25—28.
  5. Paillé JM. Calcul des structures en béton. Guide d'application. 2 ed. AFNOR, 2013, 716 p.
  6. Freyssinet E. Naissance du béton précontraint et vues d'avenir. Travaux, 1954. no. 236, 463 p.
  7. Martynov A.A. Sposob natyazheniya kanatnoy armatury pri vozvedenii zdaniy po sisteme ims [Way of Wire Rope Tensioning in the Process of Construction Using Industrial Erecting System]. Patent RF № 2264506. № 2002117939/03; zayavl. 05.07.2002; opubl. 20.11.2005 Byul. № 32 [Russian Patent no. 2264506. No. 2002117939/03; subm. 05.07.2002; published 20.11.2005, Bull. no. 32]. 6 p.
  8. Dzyuba I.S., Vatin N.I., Kuznetsov V.D. Monolitnoe bol'sheproletnoe rebristoe perekrytie s postnapryazheniem [Monolithic Longspan Ribbed Floor with Post-stress]. Inzhenerno-stroitel'nyy zhurnal [Engineering Construction Journal]. 2008, no. 1, pp. 5—12.
  9. Likhov Z.R. Zhelezobetonnye stropil'nye balki s konsol'nymi vystupami vdol' proleta [Reinforced Concrete Sloping Beams with Outriggers Along Span]. Razvitie teorii i praktiki zhelezobetonnykh konstruktsiy: sbornik nauchnykh trudov [Development of Theory and Practice of Reinforced Concrete Structures: Collection of Scientific Works]. Rostov on Don, RGSU Publ., SevkavNIPIagroprom Publ., 2003, pp. 112—114.
  10. Ryazantsev S.P., Fedorov Yu.L. Monolitnoe zhelezobetonnoe bezrigel'noe perekrytie [Monolithic Reinforced Concrete Girderless Floor Construction]. Novye idei novogo veka: materialy 10-go mezhdunarodnogo foruma IAS TOGU [New Materials of the New Century: Materials of the 10th International Forum of Pacific National University]. Khabarovsk, TOGU Publ., 2010, vol. II, pp. 90—94.
  11. Mailyan D.R., Mailyan R.L., Osipov M.V. Zhelezobetonnye balki s predvaritel'nym napryazheniem na otdel'nykh uchastkakh [Reinforced Concrete Beams with Prestress of Separate Areas]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2002, no. 2, pp. 18—20.
  12. Durability of Post-tensioning Tendons. Fib Bulletin no. 33, Lausanne, 2005, 76 p.
  13. Kritsin S.T., Markov N.A., Sharipov R.Sh. Sposob natyazheniya armaturnogo elementa s ankernym ustroystvom [Way of Reinforcing Element Tensioning with Anchor Arrangement]. Patent RF № 2037041. № 5038642/33; zayavl. 24.02.1992; opubl. 09.06.1995 [Russian Patent no. 2037041. No. 5038642/33; subm. 24.02.1992; publ. 09.06.1995. Available at: http://www.freepatent.ru/patents/2037041. Date of access: 30.03.2014.
  14. Walsh K.Q., Kurama Y.C. Behavior of Unbonded Post-tensioning Monostrand Anchorage Systems under Monotonic Tensile Loading. PCI Journal. Precast / Prestressed Concrete Institute, 2010, vol. 55, no. 1, pp. 97—117.
  15. Kishinevskaya E.V., Vatin N.I., Kuznetsov V.D. Usilenie stroitel'nykh konstruktsiy s ispol'zovaniem postnapryazhennogo zhelezobetona [Reinforcement of Building Structiures Using Poststressed Tecinforced Concrete]. Inzhenerno-stroitel'nyy zhurnal [Engineering and Construction Journal]. 2009, no. 3, pp. 29—32.

Download

INFLUENCE OF HIGH-STRENGTH REINFORCEMENT WITHOUT ADHESION TO CONCRETE ON STRENGTH OF CAST-IN-SITU BEAMLESS FLOORS

Vestnik MGSU 8/2017 Volume 12
  • Osipenko Yuri Grigoryevich - «Monolit» Candidate of Technical Sciences, Associate Professor, First Deputy General Director, «Monolit», 50 Olimpiyskiy prospekt, Mytischi, Moscow region, 141006, Russian Federation.
  • Kuznetcov Vitaliy Sergeevich - National Research Moscow State University of Civil Engineering Candidate of Technical Sciences, Associate Professor, Department of Architecture and Construction Design, National Research Moscow State University of Civil Engineering, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Shaposhnikova Yulia Alexandrovna - National Research Moscow State University of Civil Engineering Senior Lecturer, Department of Reinforced Concrete and Stone Structures, National Research Moscow State University of Civil Engineering, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 885-891

The influence and location of prestressed high-strength reinforcement without adhesion to concrete on the strength of a beamless floor panel is considered. The work is aimed at clarifying the methodology for calculating the strength of cast-in-situ beamless floor with mixed reinforcement, where reinforcement is used in a plastic shell of monostrend type without adhesion to concrete for the most complete use of the strength characteristics of the panel material. The aim of the study is to determine the level of influence and location of prestressed reinforcement without adhesion to concrete on the strength of a panel of cast-in-situ beamless floor, as well as comparison of the results obtained for the stresses of ropes in panels with contour and diagonal arrangement of prestressed reinforcement. The shape of the rope position is represented by a part of the parabola passing through the points of the rope support. On the support, the vertical and horizontal components of the reaction are determined by the longitudinal force in the rope and the exit angle of the guy rope. 9х9m cast-in-situ beamless floor panels in two variants were investigated: with diagonal and contour stressing steel. The values of increment in stresses in the ropes and the resulting values at various prestress and deflection levels, presented in the form of tables and graphs, have been calculated. According to the results of the study, the use of high-strength prestressed ropes without adhesion to concrete, as an additional working reinforcement, reduces deflections of the panels and lowers consumption of common reinforcement. The results indicate a relative decrease in efficiency of using rope strength along with an increase in the initial prestress level. From the point of ensuring load-bearing capacity, the contour positioning of ropes is preferable, due to more complete use of strength of high-tensile reinforcement. To meet the requirements of ultimate limit states, the establishment of the pre-stress level of ropes should be carried out taking into account probable achievement of the design stress in high-strength reinforcement .

DOI: 10.22227/1997-0935.2017.8.885-891

Download

Results 1 - 2 of 2