DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

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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The projected effect from acceptance of constructive solutions to ensure the reliability of an industrial facility

Vestnik MGSU 11/2015
  • Zolina Tat’yana Vladimirovna - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Professor, First Vice-rector, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sadchikov Pavel Nikolaevich - State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU") Candidate of Technical Sciences, Associate Professor, Department of Automated Design and Modeling Systems, State Autonomous Educational Institution of the Astrakhan area of higher education "Astrakhan State Architectural and Construction University" (JSC GAOU VPO "AGASU"), 18 Tatishcheva str., Astrakhan, 414000, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 68-79

The article raises the problem of increasing the reliability of an industrial building bearing the entire set of frame disturbances. One of the ways to solve it is to mount extra structural elements, previously unrecorded in the design of the object. During the study we examined some of them: installation of mechanical transverse stiffening diaphragms; increasing the rigidity of the column part above the crane; arranging connecting rods located in levels of covering in the temperature seam and crane beams. Choosing the most effective option is determined by constructive and technological features of the research object. In our case, it acts as a one-storey industrial building of hull workshop of Astrakhan maritime shipyard, equipped with overhead cranes. Using this example the calculations, which were carried out, allow estimating the effect from acceptance of constructive solutions for installation of reinforced concrete diaphragms of stiffness at the edges of framework and increase the rigidity of the column part above the crane. During the study four options are considered for calculation scheme using wall panels. These should include representation of the device: as a solid wall; in two columns wide; for large aperture sizes; at the low altitude of the end of the opening. We have presented a comparative analysis of the results before and after the introduction of the corresponding elements in the calculating model of the research object. In the accepted system of constructive measures disc coating with high horizontal rigidity distributes the load on the front diaphragm. Increasing the stiffness of above the tower crane column part gives an additional effect, as an overhead crane is located closer to the cover and in case of the column of more developed section in the above the crane area, it passes the covering greater effort. In its turn, it prevents the transverse displacement and rotation, involving the entire framework into operation. The introduction of these measures contributes to: equal declining of displacements of stresses loads from the action of the nodal points of the frame, both in the level of brake beams and in the surface level; increasing the period of achieving the object’s maximal allowable condition and an extended period of its faultless operation.

DOI: 10.22227/1997-0935.2015.11.68-79

References
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