Improvement of the Method of Calculating Plates for Punching
https://doi.org/10.22227/2949-1622.2024.1.35-42
Abstract
The article formulates proposals for improving the calculation methodology for punching. The methods in the current regulatory documents for assessing the tensile strength are based mainly on empirical dependencies obtained on the basis of numerous experimental studies. It should be noted that they give reliable results if certain design requirements are met (typical column sections). Along the interface line of the plate with a rectangular (square) column, supporting bending moments act in two orthogonal directions. The magnitude of these moments for the most common spans is large and, in an elastic setting, exceeds the span by two times. Taking into account the redistribution of forces and the most likely formation of cracks in the stretched zone, it can be argued that in the operational stage, the support sections of the plates have compressed and stretched zones. With such a stress-strain state, in the calculation scheme, when evaluating the tensile strength, the stretched part of the side surface of the “reduced” pyramid, bounded by the neutral axis along all faces, should be excluded. As a result, expressions are presented to determine the parameters of the reduced punching pyramid and the value of forces in concrete and reinforcement at the maximum bearing capacity stage.
About the Authors
N. N. Trekin
Moscow State University of Civil Engineering (National Research University) (MGSU)
Russian Federation
Russian Federation
Nikolai N. Trekin, Doctor of Technical Sciences, Associate Professor, Associate Professor of the Department of Reinforced Concrete and Masonry
Structures
26 Yaroslavskoe shosse, Moscow, 129337
V. V. Krylov
Moscow State University of Civil Engineering (National Research University) (MGSU)
Russian Federation
Russian Federation
Vladimir V. Krylov, Graduate student
26 Yaroslavskoe shosse, Moscow, 129337
K. R. Andrian
Joint Stock Company “Central Research and Design Experimental Institute (JSC Tsniipromzdaniy)”
Russian Federation
Russian Federation
Konstantin R. Andrian, Graduate student
Dmitrovskoe sh., 46/2, Moscow, 127238
References
1. Klovanich S.F., Shekhovtsov V.I. Punching of reinforced concrete slabs. Natural and numerical experiments. Odessa : ONMU, 2011.
2. Yu J., Luo L.-Z., Fang Q. Structure behavior of reinforced concrete beam-slab assemblies subject to perimeter middle column removal scenario. Engineering Structures. 2020. Vol. 208. No. 110336. Рp. 1-19. DOI: 10.1016/j.engstruct.2020.110336
3. Caldentey A.P., Diego Y.G., Fernández F.A., Santos A.P. Testing robustness: A full-scale experimental test on a two-storey reinforced concrete frame with solid slabs. Engineering Structures. 2021. Vol. 240. No. 112411. Рp. 1-17. DOI: 10.1016/j.engstruct.2021.112411
4. Men J., Xiong L., Wang J., Fan G. Effect of different RC slab widths on the behavior of reinforced concrete column and steel beam-slab subassemblies. Engineering Structures. 2021. Vol. 229. No. 111639. Р. 1. DOI: 10.1016/j.engstruct.2020.111639.
5. Eladawy M., Hassan M., Benmokrane B., Ferrier E. Lateral cyclic behavior of interior two-way concrete slab–column connections reinforced with GFRP bars. Engineering Structures. 2020. Vol. 209. No. 109978. Рp. 1-15. ISSN 0141-0296. DOI: 10.1016/j.engstruct.2019.109978
6. Deifalla A. A mechanical model for concrete slabs subject to combined punching shear and in-plane tensile forces. Engineering Structures. 2021. Vol. 231. No. 111787. Рp. 1-14. DOI: 10.1016/j.engstruct.2020.111787
7. Yu J.L., Wang Y.C. Modeling and design method for static resistance of a new connection between steel tubular column and flat concrete slab. Journal of Constructional Steel Research. 2020. Vol. 173. No. 106254. Рp. 1-16. DOI: 10.1016/j.jcsr.2020.106254
8. Kumar V., Kartik K.V., Iqbal M.A. Experimental and numerical investigation of reinforced concrete slabs under blast loading. Engineering Structures. 2020. Vol. 206. No. 110125. Рp. 1-13. ISSN 0141-0296. DOI: 10.1016/j.engstruct.2019.110125
9. Mao L., Barnett S.J., Tyas A., Warren J., Schleyer G.K., Zaini S.S. Response of small scale ultra high performance fiber reinforced concrete slabs to blast loading. Construction and Building Materials. 2015. Vol. 93. Pр. 822-830. DOI: 10.1016/j.conbuildmat.2015.05.085
10. Fernández R.M., Mirzaei Y., Muttoni A. Post-Punching Behavior of Flat Slabs. ACI Structural Journal. 2013. Vol. 110. Рp. 801-812. URL: https://www.researchgate.net/publication/283905342
11. Melo G.S. Behavior of Reinforced Concrete Flat Slabs after Local Failure. PhD thesis, Polytechnic of Central London, London, UK, 1990. 214 p. URL: https://www.researchgate.net/publication/352157118
12. More R.S., Sawant V.S. Analysis of Flat Slab. July 2015. Vol. 4. Issue 7. URL: https://www.ijsr.net/get_abstract.php
13. Trekin N.N., Krylov V.V. On the issue of the load-bearing capacity of slabs for punching under dynamic loading on ground-based space infrastructure objects. Scientific aspect. 2018. Vol. 7. No. 4. Pр. 771-776.
14. Krylov V.V. Testing the load-bearing capacity of a monolithic slab for punching under the action of a dynamic load. Scientific aspect. 2019. Vol. 3. No. 3. Pр. 320-325.
15. Krylov V.V., Sarkisov D.Yu., Ergeshov E.T., Evstafieva E.B. A program of experimental studies of the loadbearing capacity of beamless slabs for punching under dynamic loading. design of prototypes. Construction materials and products. 2020. Vol. 3. No. 3. Pp. 47-53. DOI: 10.34031/2618-7183-2020-3-3-47-53
16. Trekin N.N., Krylov V.V., Trofimov S.V., Evstafieva E.B., Sarkisov D.Yu. Experimental and theoretical study of the punching strength of slabs. Vestnik MGSU. 2021. Vol. 16. Pр. 1006-1014.
17. Trekin N.N., Krylov V.V., Evstafieva E.B., Andryan K.R. Experimental study of the punching strength of slabs under dynamic loading. Construction materials and products. 2021. Vol. 4. No. 4. Pр. 41-48.
18. Trekin N.N., Sarkisov D.Yu., Krylov V.V., Evstafieva E.B., Andryan K.R. Bearing capacity of monolithic reinforced concrete slabs for punching under static and dynamic loading. Building and reconstruction. 2022. No. 5 (103). Pp. 67-79.
19. Krylov V.V. Punching strength under static and dynamic loading. Engineering Bulletin of the Don. 2024. No. 1.
20. Trekin N.N., Kodysh E.N., Shmakov S.D., Chaganov A.B., Cherepanov A.V. Development of a Stress Sensor for Solids. Reinforced concrete structures. 2024. No. 5(1). Рр. 45-56. DOI:10.22227/2949-1622.2024.1.45-56 (in Russian).
21. Pekin D.A. The influence of bending on the mechanism of pushing through the support zone of a reinforced concrete slab. Industrial and Civil Construction. 2019. No. 10. Pp. 20-28.
22. Bolgov A.N. Reliability of formulas SP 52-101–2003 when calculating punching force. Industrial and civil construction. 2013. No. 2. Pp. 41-43.
Review
For citations:
Trekin N.N., Krylov V.V., Andrian K.R. Improvement of the Method of Calculating Plates for Punching. Reinforced concrete structures. 2024;6(2):35-42. (In Russ.) https://doi.org/10.22227/2949-1622.2024.1.35-42
Views:
180
Email this article 