Designing and detailing of building systems . Mechanics in civil engineering

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

Вестник МГСУ 8/2017 Том 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.

Страницы 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

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