DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

The experience of strengthening reinforced concrete frame by flat capitals, installed on the top of slabs

Vestnik MGSU 4/2015
  • Lyudkovskiy Andrey Mikhaylovich - LLC Scientific Production Center “Reconstruction” Candidate of Technical Sciences, director, LLC Scientific Production Center “Reconstruction”, 1 Avtozavodskaya str., Moscow, 115280, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 80-89

The investigations were conducted of the nodes of reinforced concrete frame after increasing loads. The floor slabs in areas of bearing on the columns were reinforced by upper flat capitals. After the completion of construction works the nodes were tested in construction conditions by test loads exceeding the designed ones. The deflections were measured, disclosure of cracks was recorded in the process of loading. The tests have shown high efficiency of the applied design solutions. The calculations were conducted on the example of reinforced concrete frame of a residential building, the designed loads on which were increased from 9.8 up to 14.0 kPa after completion of construction. Basing on the calculations it was needed to reinforce the nods of slabs’ bearing on the columns, in which there already appeared cracks on the upper surfaces of slabs. It was decided to strengthen the bearing nodes by metal capitals and reinforced concrete footings. The foundations and columns of the building possessed sufficient reserves of bearing capacity.

DOI: 10.22227/1997-0935.2015.4.80-89

References
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  2. Zolotukhin Yu.D., Barbakadze V.Sh., Gerasimov I.D., Strabakhin N.I. Ispytanie sooruzheniy : spravochnoe posobie [Testing Structures. Reference Book]. Minsk, Vysheyshaya shkola Publ., 1992, 272 p. (In Russian)
  3. Avdeychikov G.V. Ispytanie stroitel’nykh konstruktsiy [Testing Building Structures]. Moscow, ASV Publ., 2009, 160 p. (In Russian)
  4. Lyudkovskiy A.M. O modelirovanii raboty massivnykh zhelezobetonnykh elementov AES pri deystvii kontsentrirovannykh nagruzok [On Modeling Massive Concrete Elements Operation of NPP under the Action of Concentrated Loads]. Voprosy atomnoy nauki i tekhniki. Seriya: Proektirovanie i stroitel’stvo [Problems of Nuclear Science and Technology. Series: Design and Construction]. 1986, no. 3. (In Russian)
  5. Bolgov A.N., Sokurov A.Z., Alekseenko D.V. Prodavlivanie kraynikh uzlov sopryazheniya plita — kolonna, usilennykh vkleennoy poperechnoy armaturoy [Punching of the Hips of the Junctions Slab — Column Reinforced by Glued Transverse Reinforcement]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2013, no. 3, pp. 11—14. (In Russian)
  6. Bolgov A.N., Sokurov A.Z., Alekseenko D.V. Prodavlivanie promezhutochnykh uzlov sopryazheniya plita — kolonna, usilennykh vkleennoy poperechnoy armaturoy [Punching of the Intermediate Nodes of the Junctions Slab — Column Reinforced by Glued Transverse Reinforcement]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 2014, no. 3, pp. 10—14. (In Russian)
  7. GOST 17624—87. Betony. Ul’trazvukovoy metod opredeleniya prochnosti [Russian State Standard GOST 17624—87. Concretes. Ultrasound Method of Strength Determination]. Elektronnyy fond pravovoy i normativno-tekhnicheskoy dokumentatsii [Electronic Fund of Legislative and Normative-Technical Documentation]. Available at: http://docs.cntd.ru/document/gost-17624-87. Date of access: 05.03.2015. (In Russian)
  8. GOST 22690—88. Betony. Opredelenie prochnosti mekhanicheskimi metodami nerazrushayushchego kontrolya [Russian State Standard GOST 22690—88. Concretes. Determining the Strength by Mechanical Methods of Undischatged Control]. Elektronnyy fond pravovoy i normativno-tekhnicheskoy dokumentatsii [Electronic Fund of Legislative and Normative-Technical Documentation]. Available at: http://docs.cntd.ru/document/gost-22690-88. Date of access: 05.03.2015. (In Russian)
  9. Tikhonov I.N. Armirovanie elementov i monolitnykh zhelezobetonnykh zdaniy : Posobie po proektirovaniyu [Reinforcement of the Elements and Monolithic Reinforced Concrete Buildings : Manual on Design]. Moscow, FGUP TsPP Publ., 2007, 170 p. (In Russian)
  10. Kapilovskiy V.S., Kriksunov A.Z., Malyarenko A.A., Perel’muter A.V., Perel’muter M.A. SCAD Office. Vychislitel’nyy kompleks SCAD [SCAD Office. Computing System SCAD]. Moscow, SKAD SOFT Publ., 2007, 592 p. (In Russian)
  11. Gvozdev A.A., Baykov V.N. K voprosu o povedenii zhelezobetonnykh konstruktsiy v stadii blizkoy k razrusheniyu [On the Question of Reinforced Concrete Structures Operation in a Stage Close to Destruction]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 1977, no. 9, pp. 22—24. (In Russian)
  12. Maniskevich E.S., Morozenskiy V.L., Pyzhov Yu.K. Prochnost’ na prodavlivanie opornykh zon perekrytiy, vozvodimykh metodom pod”ema [Punching Shear Strength of the Support Zones of the Slabs, Constructed by the Method of Lifting]. Beton i zhelezobeton [Concrete and Reinforced Concrete]. 1982, no. 4, pp. 21—22. (In Russian)
  13. SNiP 2.01.07—85. Nagruzki i vozdeystviya [Construction Norms SNiP 2.01.07—85. Loads and Impacts]. Elektronnaya biblioteka dokumentov [Electronic Library of Documents]. Available at: http://focdoc.ru/down/o-1842.html. Date of access: 05.03.2015. (In Russian)
  14. SP 20.13330.2011. Nagruzki i vozdeystviya. Aktualizirovannaya redaktsiya SNiP 2.01.07—85* [Requirements SP 20.13330.2011. Loads and Impacts. Revised Edition of Construction Norms SNiP 2.01.07—85*]. Elektronnyy fond pravovoy i normativno-tekhnicheskoy dokumentatsii [Electronic Fund of Legislative and Normative-Technical Documentation]. Available at: http://docs.cntd.ru/document/1200084848. Date of access: 05.03.2015. (In Russian)
  15. SP 52-101—2003. Betonnye i zhelezobetonnye konstruktsii bez predvaritel’nogo napryazheniya armatury [Requirements SP 52-101—2003. Concrete and Reinforced Concrete Structures without Prestress of Reinforcement]. Elektronnyy fond pravovoy i normativno-tekhnicheskoy dokumentatsii [Electronic Fund of Legislative and Normative-Technical Documentation]. Available at: http://docs.cntd.ru/document/1200037361. Date of access: 05.03.2015. (In Russian)

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DEFLECTION CALCULATION OF REINFORCED CONCRETE FLEXURAL ELEMENTS WITH THE TOP LAYER MADE OF HIGH QUALITY CONCRETE

Vestnik MGSU 3/2016
  • Potapov Yuriy Borisovich - Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE) Doctor of Technical Sciences, Professor, Department of Building Structures, Bases and Foundations named after Prof. Borisov Yu.M., Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE), 84 20-letiya Oktyabrya str., Voronezh, 394006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Barabash Dmitriy Evgen’evich - Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE) Doctor of Technical Sciences, Professor, Department of Building Structures, Bases and Foundations named after Prof. Borisov Yu.M., Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE), 84 20-letiya Oktyabrya str., Voronezh, 394006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Rogatnev Yuriy Fedorovich - Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE) Doctor of Technical Sciences, Professor, Department of Building Structures, Bases and Foundations named after Prof. Borisov Yu.M., Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE), 84 20-letiya Oktyabrya str., Voronezh, 394006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Panfilov Dmitriy Vyacheslavovich - Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE) Candidate of Technical Sciences, Associate Professor, chair, Department of Building Structures, Bases and Foundations named after Prof. Borisov Yu.M., Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE), 84 20-letiya Oktyabrya str., Voronezh, 394006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Mehdi Jawid Mohammad - Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE) postgraduate student, Department of Building Structures, Bases and Foundations named after Prof. Borisov Yu.M., Voronezh State University of Architecture and Civil Engineering (Voronezh SUACE), 84 20-letiya Oktyabrya str., Voronezh, 394006, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 26-36

One of the main requirements to the operational integrity of reinforced concrete flexural elements is nonexeedance of the deflection limits at the assumed load. It is possible to provide the given requirement using different methods, one of which is the production of a sandwich construction of the concretes with different strength. The article presents the results of theoretical and experimental investigations of the deflection of reinforced concrete beams with the top layer made of high-quality concrete, with different percentage and strength of longitudinal tensile reinforcement without prestressing. The study of different methods of calculating the curvature of reinforced concrete beams is carried out and the recommendations on calculating the deflections of such elements are made. The use of high quality concrete in the compression area of flexural elements allows reducing the deflections. The theoretical deflections of beams produced of the B60 class concrete are 15…20 % more than the deflections of the proposed composite sections in case of equal bearing capacity. The authors proposed a formula to calculate the bending of reinforced concrete flexural members with the top layer made of high-quality concrete in the compressed area.

DOI: 10.22227/1997-0935.2016.3.26-36

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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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Numerical and experimental investigations of steel-concrete beams with thin-walled section

Vestnik MGSU 1/2019 Volume 14
  • Zamaliev Farit S. - Kazan State University of Architecture and Engineering (KSUAE) Candidate of Technical Sciences, Professor, Associate Professor of Department of Metal Structures and Testing of Structures, Kazan State University of Architecture and Engineering (KSUAE), 1 Zelenaya st., Kazan, 420043, Russian Federation.

Pages 22-32

Introduction. Conducted is to the evaluation of the stress-strain state of the steel-concrete beams with thin-walled section. In recent times, steel-reinforced concrete structures have become widely used in civilian buildings (beams, slabs, columns). Thin-walled section have not found wide application in steel concrete structures, unlike steel structures. Presents the results of numerical studies of beams consisting of concrete, anchors and steel beams. Two investigating of the location of anchors are given. Numerical investigations are presented of steel-concrete beams with thin-walled section based on numerical studies. Testing procedure and test result are given. Results of calculations, comparison of numerical and experimental studies are presented. Materials and methods. For full-scale experiments, steel I-beams with filling of side cavities with concrete were adopted, screws are used as anchor ties, with varied both the lengths and their location (vertically and obliquely). As steel curved C-shaped steel profiles were used steel profiles from the range of the company “Steel Faces”. ANSYS software package was used for computer modeling. A total of 16 steel concrete beams were considered, for which the results of strength and stiffness evaluation were obtained in ANSYS. Results. The data of the stress-strain state of beams on the basis of computer simulation are obtained. The results are used for the production of field samples. Data of computer simulation are compared with the indicators of field experiments. Conclusions. The stress-strain state of steel-concrete structures was studied on the basis of numerical and experimental data. The proposed calculation method gives good convergence with the experimental data. Anchor connections made from self-tapping screws can be used in studies for modeling in steel-concrete beams structures and other anchor devices, ensuring the joint operation of concrete and steel profiles in structures.

DOI: 10.22227/1997-0935.2019.1.22-32

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