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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

IDENTIFICATION OF MUTUAL INFLUENCE OF BENDING AND TORSIONAL STRAINS OF THE REINFORCED CONCRETE SPACE GRID FLOOR AS PART OF THE MONITORING OF ITS ERECTION

Vestnik MGSU 7/2012
  • Plotnikov Alexey Nikolaevich - Chuvash State University named after I.N. Ulyanov (ChuvSU) Associate Professor of Building Structures, +7 (8352) 62 45 96, Chuvash State University named after I.N. Ulyanov (ChuvSU), 15 Moskovskiy Prospekt, Cheboksary, 428015, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 82 - 89

The author presents the results of measurements of total deformations of the space-grid floor in relation to the torsional strain of beams and the rigidity of beams in bending and torsion while monitoring the erection of the floor of a building.
Any space grid system is utterly sensitive to changes in relations between the rigidity of elements. No experimental data covering space grid floors or any method of analysis of their stress-strain state are available.
The author performed the assessment of interrelations between the rigidity of some beams in the two directions by means of a full-scale loading test (monitoring) of the monolithic space grid floor, beam size 8.0 × 9.2 m. The purpose of the assessment was to confirm the bearing capacity and the design patterns based on deflections and stresses of elements to select the operational reinforcement value. Monolithic concrete was used to perform the load test.
As a result, the width of concrete ribs was found uneven. In the design of reinforced concrete space rib floors it is advisable to develop detailed models of structures through the employment of the finite element method due to the significant sensitivity of the system to distribution and redistribution of stresses.
Large spans of monolithic space rib floors require the monitoring of the stress-strain state and computer simulations to adjust the design pattern on the basis of the monitoring results.

DOI: 10.22227/1997-0935.2012.7.82 - 89

References
  1. Cao M., Ren Q., Qiao P. Nondestructive Assessment of Reinforced Concrete Structures Based on Fractal Damage Characteristic Factor», Journal of Engineering Mechanics, vol. 132, no. 9, pp. 924—931.
  2. Plotnikov A.N. Raspredelenie i pereraspredelenie usiliy v opertykh po konturu zhelezobetonnykh setchato-rebristykh sostavnykh perekrytiyakh [Distribution and Redistribution of Forces in Reinforced Concrete Space Grid Layered Floors Supported on Four Sides]. Proceedings of the All-Russian Conference of Young Scientists «Building Structures — 2000». State University of Civil Engineering, 2000.
  3. Plotnikov A.N. Izmenenie napryazhenno-deformirovannogo sostoyaniya zhelezobetonnoy perekrestno-rebristoy sistemy v protsesse ee vklyucheniya v sostav sloistogo perekrytiya vysotoy 2,1 m [The Change of the Stress-strain State of the Reinforced Concrete Space Rib System in the Course of Its Incorporation into the Layered Floor, Height 2.1 m]. Industrial and Civil Engineering in the Modern World. Collections of research projects of the Institute of Construction and Architecture. Moscow State University of Civil Engineering, 2011.
  4. Plotnikov A.N. Modelirovanie metodom konechnykh elementov (MKE) zhelezobetona pri kruchenii s izgibom [Simulation of Reinforced Concrete in the event of Torsion with Bending by the Method of Finite Elements (FEM)]. International Journal for Computational Civil and Structural Engineering. Vol. 6, no. 1 and 2, 2010. Moscow State University of Civil Engineering, pp.177-178. Available at: URL:http://www.mgsu.ru/images/stories/ nash_universitet/ Vestnik/IJCCSE _v6_i12_2010.pdf/ Date of Access: 22.11.2011.
  5. Aivazov R.L., Plotnikov A.N. Modelirovanie napryazhennogo sostoyaniya perekrestnykh elementov s razlichnym sootnosheniem zhestkostey na izgib metodom konechnykh elementov [Simulation of the Stress State of Cross Elements with Different Ratios of Bending Rigidity by the Finite Element Method]. New in Architecture, and Reconstruction of Structures: Proceedings of the Sixth All-Russian Conference NASKR - 2005. Chuvash State University, Cheboksary, 2005.
  6. Plotnikov A.N., Ezhov A.V., Sabanov A.I. Obsledovanie zhelezobetonnykh perekrytiy, obrazovannykh perekrestnymi rebrami s tsel’yu otsenki ikh napryazhenno-deformirovannogo sostoyaniya [Examination of Reinforced Floors Formed by Cross Ribs in order to Assess Their Stress-Strain State]. Prevention of Accidents of Buildings and Structures — 2011. Moscow. 2011. Available at: http://pamag.ru/pressa/deformat-status/ Date of Access: 21/11/2011.
  7. Bailey C.G., Toh W.S., Chan B.M., Simplified and Advanced Analysis of Membrane Action of Concrete Slabs. ACI JOURNAL, vol. 105, no. 1, 2008, pp. 30—40.
  8. SP 52-101—2003. Betonnye i zhelezobetonnye konstruktsii bez predvaritel’nogo napryazheniya armatury [Building Rules 52-101—2003. Concrete and Reinforced Concrete Structures without Prestressing of Reinforcement]. Moscow, 2004.
  9. Tekhnicheskiy kodeks ustanovivsheysya praktiki [Technical Code of Practice]. EN 1992-1-1:2004 Eurocode 2: Design of concrete structures — Part 1-1: General rules and rules for buildings. Ministry of Architecture and Construction of Belarus. Minsk, 2010.
  10. JSCE Guideline for Concrete no. 15. Standard Specifications for Concrete Structures — 2007. JSCE Concrete Committee. Design Publ., Japan, 2010.
  11. Aivazov R.L., Plotnikov A.N. Zhestkost’ zhelezobetonnykh perekrestnykh sistem na kruchenie i vliyanie ee izmeneniya na obshchee NDS [Rigidity of Reinforced Concrete Cross-Systems in Torsion and Its Effect on the Overall Change in the Stress-Strain State]. New in Architecture, and Reconstruction of Structures. Proceedings of the Sixth All-Russian Conference NASKR - 2007. Chuvash State University, Cheboksary, 2009.
  12. Plotnikov A.N., Ezhov A.V., Sabanov A.I. Pereraspredelenie usiliy v perekrestno-rebristom zhelezobetonnom perekrytii pri ekspluatatsii [Redistribution of Forces within Reinforced Concrete Space Rib Floors in the Course of Operation]. Industrial and Civil Engineering in the Modern World. Collections of research projects of the Institute of Construction and Architecture. Moscow State University of Civil Engineering, 2011.

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