Structural Behavior of Reinforced Concrete Flat Plate with Double Steel Plates as Shear-head
Article Sidebar
Main Article Content
Abstract
This paper presents an experimental investigation on the behavior of punching shear of flat plate reinforced concrete slabs with double steel plates as shearhead. Five reinforced concrete square slabs of 70 mm thickness were confirmed as four edges simply supported by a 900 mm span length and tested under a static concentrated load at the center of the slab. The proposed shearhead consists of double rectangular steel plates (sandwiched, at top and bottom) connected by four studs, and installed at each column side in the column-slab connection area. The effect of steel plates length (90 mm and 180 mm) and thickness (2 mm and 4 mm) have been investigated through studying their effect on crack pattern, failure mode, load-deflection behavior, ultimate loads, elastic stiffness, and absorbing energy. Specimen SB2 (with steel plate of 180 mm length and 4 mm thickness) has the best enhancement in ultimate load, elastic stiffness, and absorbing energy by 29.5, 268, and 92 %, respectively, in comparison with the reference slab without shear reinforcement. Also, the experimental values of punching shear strength were compared with the proposed equation of design codes (ACI and EC2). In comparison with the experimental results, the prediction equations of codes show conservative values for slabs without shear reinforcement, and good agreement results for slabs with shear reinforcement.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Licensed under a CC-BY license: https://creativecommons.org/licenses/by-nc-sa/4.0/
How to Cite
References
P. Bhatt, T.J. MacGinley, and B.S. Choo, Reinforced concrete – Design theory and examples. 3rd ed. Publisher: Taylor & Francis, London, UK, 2006.
D.R. Oliveira, G.S. Melo, and P.E. Regan, “Punching strengths of flat plates with vertical or inclined stirrups,” ACI Structural Journal, vol. 97, no.3, pp. 485–491, 2000. DOI: 10.14359/4643
S. Lips, M.F. Ruiz, and A. Muttoni, “Experimental investigation on punching strength and deformation capacity of shear-reinforced slabs,” ACI Structural Journal, vol. 109, no. 6, pp. 889–900, 2012. https://doi.org/10.14359/51684132
S.M. Allam, “Effect of shear reinforcement on punching shear strength of reinforced concrete slabs,” International Review of Civil Engineering, vol. 4, no.5, pp. 253–264, 2013.
P.G. Fernández, A. Marí, and E. Oller, “Theoretical prediction of the punching shear strength of concrete flat slabs under in-plane tensile forces,” Engineering Structures 229, 111632, 2020. https://doi.org/10.1016/j.engstruct.2020.111632
H.A. Ali, and M.H. Al-Sherrawi, “Steel collar strengthening of a slab-column connection under eccentric load,” Engineering, Technology and Applied Science Research, vol. 14, no.4, pp. 14677–14684, 2024. https://doi.org/10.48084/etasr.7391
J.S. Al-Abasi, M.M. Rasheed, and M.A. Yaseen, “Experimental study of lightweight concrete flat plate with sandwich shear plates,” Journal of Engineering and Development, vol. 16, no. 4, pp. 107–126, 2012. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1143
K.F. El-Kashif, E.A. Ahmed, and H.M. Salem, “Experimental investigation of strengthening slab-column connections with CFRP fan,” Ain Shams Engineering Journal, vol. 10, no.3, pp. 639–650, 2019. https://doi.org/10.1016/j.asej.2019.02.005
American Concrete Institute (ACI), ACI-318, Building code requirements for structural concrete and , commentary, USA, 2019.
European Committee for Standardization (CEN), Eurocode 2: design of concrete structures – part 1-1: General rules and rules for buildings. European Committee for Standardization. Brussels. 2001
R.T.S. Mabrouk, A. Bakr, and H. Abdalla, “Effect of flexural and shear reinforcement on the punching behavior of reinforced concrete flat slabs,” Alexandria Engineering Journal, vol. 56, no.4, pp. 591–599, 2017. https://doi.org/10.1016/j.aej.2017.05.019
M.A. Golham, and A.H.A. Al-Ahmed, “Strengthening of GFRP reinforced concrete slabs with openings,” Journal of Engineering, vol. 30, no.1, pp. 157–172, 2024. https://doi.org/10.31026/j.eng.2024.01.10
M. Navarro, S. Ivorra, and F.B. Varona, “Parametric computational analysis for punching shear in RC slabs,” Engineering Structures, vol. 65, pp. 254–263, 2018. https://doi.org/10.1016/j.engstruct.2018.03.035
H.K. Ammash, S.S. Kadhim, and M.K. Dhahir, “Repairing half-loaded flat slabs against punching shear using steel stiffeners,” Case Studies in Construction Materials 16, e01032, 2022. https://doi.org/10.1016/j.cscm.2022.e01032
A.M. Ibrahim, and M.S. Fawzy, “Strengthening of RC flat slabs against punching shear with GFRP laminates adopting a hybrid technique,” Engineering and Applied Science Research, vol. 50, no.5, pp. 490–498, 2023. https://ph01.tci-thaijo.org/index.php/easr/article/view/253016
M.M. Majeed, and A.N. Abbas, “Punching shear strength characteristics of flat plate panels reinforced with shear-head collars: Experimental investigation,” Civil Engineering Journal, vol. 5, no.3, pp. 528–539, 2019. https://doi.org/10.28991/cej-2019-03091265
E.A. Abood, M.H. Abdallah, M. Alsaadi, H. Imran, L.F.A. Bernardo, D. De Domenico, and S.N. Henedy, “Machine learning-based prediction models for punching shear strength of fiber-reinforced polymer reinforced concrete slabs using a gradient-boosted regression tree,” Materials, vol. 17, no.16, 3964, 2024. https://doi.org/10.3390/ma17163964
H.J. Yan, and N. Xie, “Optimized machine learning algorithms for predicting the punching shear resistance of flat slabs with transverse reinforcement,” International Journal of Concrete Structures and Materials, vol. 18, no.1, 76, 2024. https://doi.org/10.1186/s40069-024-00721-9
L. Satjapan, I. Thanongsak, S. Monthian, G. Reyes, and K. Boksun, “Punching Shear Capacity of Recycled Aggregate Concrete Slabs,” Buildings vol. 12, no.10, 1584, 2022. https://doi.org/10.3390/buildings12101584
A.M. Saadoon, M.A. Mashrei, K.A. Al Oumari, “Punching shear strength of recycled aggregate-steel fibrous concrete slabs with and without strengthening,” Advances in Structural Engineering, vol. 25, no.10, pp. 2175–2190, 2022. https://doi.org/10.1177/13694332221090288
A.A. Abdulhussein, and M.H. Al-Sherrawi, “Experimental and numerical analysis of the punching shear resistance strengthening of concrete flat plates by steel collars,” Engineering, Technology and Applied Science Research, vol. 11, no.6, pp. 7853–7860, 2021. https://doi.org/10.48084/etasr.4497
Iraqi specifications (No. 5-2019), Portland cement. Iraqi Central Organization for Standardization and Quality Control, 2019.
Iraqi specifications (No. 45-1984), Aggregates from natural sources for concrete and building construction. Iraqi Central Organization for Standardization and Quality Control, 1984.
ASTM C494M, Standard specification for chemical admixtures for concrete. ASTM International, 2017.
ASTM C39, Test method for compressive strength of cylindrical concrete specimens. ASTM International, 1986.
ASTM C469a, Test method for static modulus of elasticity and Poisson's ratio of concrete in compression. ASTM International, 2003.
ASTM C78, Test method for flexural strength of concrete. ASTM International, 1984.
ASTM C496, Standard test method for splitting tensile strength of cylindrical concrete specimens. ASTM International, 2003.
S. Lulu, S. Yuanxie, and L. Shixue, “Reliability Analysis of RC Slab-Column Joints under Punching Shear Load Using a Machine Learning-Based Surrogate Model,” Building, vol. 12, no.10, 1750, 2022. https://doi.org/10.3390/buildings12101750