DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Peculiarities of stress distribution in beamless floor plate as a result of prestressing forces

Vestnik MGSU 9/2014
  • Kremnev Vasiliy Anatol'evich - LLC "InformAviaKoM" Director General, LLC "InformAviaKoM", 2 Pionerskaya str., Korolev, Moscow Region, 141074, Russian Federation; +7 (495) 645-20-62; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • 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 48-53

The article discusses the features of the stress state of the plate of capitalless girderless overlapping as a result of force of prestressed reinforcement, where the reinforcement used is high-strength reinforcement in flexible shell of "Monostrend" type. The peculiarity of specific design solution is a diagonal arrangement of prestressed reinforcement with heads fixed at the outer edges of the columns. The purpose of this arrangement of the prestressed reinforcement is deflection reduction of the central area of a plate and reduction of the width of cracks on the lower surface in the bay and on the upper surface of the support areas. The article shows the distribution of normal stresses of existing loads in the plane plate. The stress distribution over the thickness of the plate was assumed uniform. In order to establish design size of a section in diagonal direction it is possible to set the variables x and y and then calculate the coordinates of stress distribution curves in the concrete as a result of compression by prestress force. The authors offer diameter values of equal stresses in case of 4 and 8 K7O ropes. The method of calculating prestressing losses of concrete creep are offered.

DOI: 10.22227/1997-0935.2014.9.48-53

References
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NUMERICAL AND FULL-SCALE EXPERIMENTS OF PRESTRESSED HYBRID REINFORCED CONCRETE-STEEL BEAMS

Vestnik MGSU 3/2018 Volume 13
  • Zamaliev Farit Sakhapovich - Department of Metal Structures and Testing of Structures, Kazan State University of Architecture and Engineering (KSUAE) Candidate of Technical Sciences, Professor, Associate Professor, Department of Metal Structures and Testing of Structures, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya st., Kazan, 420043, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 309-321

Recently, civil buildings are increasingly using composite reinforced concrete and steel (RCS) structures (beams, slabs, columns). Prestress in RCS structures has not yet found such a spread as, for example, in reinforced concrete and metal structures, although its use is known from technical sources. The present article is devoted to the evaluation of the stress-strain state of prestressed RCS beams. The procedure and results of computer modeling of the response of composite RCS beams consisting of steel I-beam, anchors, prestressed reinforcement and concrete are given. Two variants of arrangement of prestressed reinforcement are considered. According to the data of numerical studies, full-scale samples of beam models were made and their tests were carried out. The article presents the test procedure, the results of experimental studies in the form of graphs, diagrams. At the end of the article, analytical expressions are given for analysis of composite RCS beams of the described cross-section. Results of calculations, comparison of the results of numerical and full-scale experiments are presented. Subject: based on computer simulation and full-scale experiments, the stress-strain state of prestressed composite beams was investigated. Beams were studied with the arrangement of prestressed reinforcement along the I-beam flanges and along the envelope of the bending moment diagram. Research objectives: analyze the stress-strain state of beams, identify effectiveness of the arrangement of prestressed reinforcement. Materials and methods: for full-scale experiments, steel I-beams with lateral cavities filled with concrete were adopted, rod reinforcement was used as a prestressed reinforcement, and a dynamometric key was used for prestress (preload). ANSYS software package was used for computer modeling. Results: the computer simulation data of the stress-strain state of beams is obtained. The results are used for making full-scale samples. The obtained results of computer simulation are compared with the data of full-scale experiments. Conclusions: essential features of the response of prestressed composite beams are studied from numerical modeling, in-situ experiments and analytical calculations. The proposed calculation method gives a good match with the experimental data.

DOI: 10.22227/1997-0935.2018.3.309-321

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