Experimental Evaluation of the Punching Shear Strength of Interior Slab-column Connections with Different Shear Reinforcement Details

Rasha Mabrouk, Gehad Younis, Osman Ramadan

Abstract


This research aims to evaluate the effect of using different shear reinforcement details on the punching shear behavior of interior slab column connections. A comprehensive experimental program is conducted on sixteen specimens having the same concrete dimensions of 1100×1100×160 mm where the slab depth is chosen to be less than that stipulated by different design codes. The parameters under examination were the type of shear reinforcement arranged in a cross shape perpendicular to the column edges (single leg, multi-leg, and closed stirrups), the spacing between stirrups (25 and 50 mm), and the extended length covered by the stirrups (300 and 425 mm). Experimental results showed that slabs reinforced with multi-leg or closed stirrups, even for slabs with a thickness of 160 mm, had an increase in the shear capacity by up to 40% depending on the stirrup amount. A noticeable enhancement in ductility was also observed. Slabs reinforced with vertical single-leg stirrups did not exhibit any improvements. A finite element analysis was conducted to further assess the punching shear behavior of the tested specimens. A comparison between the test results and values obtained using design codes such as ACI 318-19 and ECP 203-2018 showed that the two design codes give a rather underestimated prediction of the punching shear capacity.

 

Doi: 10.28991/CEJ-2022-08-09-015

Full Text: PDF


Keywords


Punching Shear; Single-Leg Stirrups; Multi-Leg Stirrup; Closed Stirrup; Ductility; ANSYS.

References


Lips, S., Fernández Ruiz, M., & Muttoni, A. (2012). Experimental investigation on punching strength and deformation capacity of shear-reinforced slabs. ACI Structural Journal, 109(6), 889-900. doi:10.14359/51684132.

ACI Committee 318-19. (2019). Building Code Requirements for Structural Concrete. American Concrete Institute (ACI), Farmington Hills, United States. doi:10.14359/51716937.

ECP 203-2018. (2018). Egyptian Building Code for Structural Concrete Design and Construction. Ministry of Housing, Utilities & Urban Communities, Cairo, Egypt.

EN 1992-1-1. (2004). Eurocode 2: Design of concrete structure-Part 1-1: General rules and rules for buildings. European Committee for Standardization, Brussels, Belgium.

Papanikolaou, K. V., Tegos, I. A., & Kappos, A. J. (2005). Punching shear testing of reinforced concrete slabs, and design implications. Magazine of Concrete Research, 57(3), 167–177. doi:10.1680/macr.2005.57.3.167.

Hegger, J., Sherif, A. G., Kueres, D., & Siburg, C. (2017). Efficiency of Various Punching Shear Reinforcement Systems for Flat Slabs. ACI Structural Journal, 114(3), 631–642. doi:10.14359/51689434.

Mabrouk, R. T. S., Bakr, A., & Abdalla, H. (2017). Effect of flexural and shear reinforcement on the punching behavior of reinforced concrete flat slabs. Alexandria Engineering Journal, 56(4), 591–599. doi:10.1016/j.aej.2017.05.019.

Broms, C. E. (2019). Cages of inclined stirrups as shear reinforcement for ductility of flat slabs. ACI Structural Journal, 116(1), 83–92. doi:10.14359/51710871.

Issa, A. M., Salem, M. M., Mostafa, M. T., Hadhoud, H. M., & Ghit, H. H. (2019). Performance of Shear Reinforcement against Punching Shear Loads. International Journal of Engineering and Advanced Technology, 9(2), 841–850. doi:10.35940/ijeat.b3975.129219.

Schmidt, P., Kueres, D., & Hegger, J. (2020). Punching shear behavior of reinforced concrete flat slabs with a varying amount of shear reinforcement. Structural Concrete, 21(1), 235–246. doi:10.1002/suco.201900017.

Raafat, A., Fawzi, A., Metawei, H., & Abdalla, H. (2021). Assessment of stirrups in resisting punching shear in reinforced concrete flat slab. HBRC Journal, 17(1), 61–76. doi:10.1080/16874048.2021.1881422.

Polak, M. A., El-Salakawy, E., & Hammill, N. L. (2005). Shear reinforcement for concrete flat slabs. Special Publication, 232, 75-96.

Broms, C. E. (1990). Shear reinforcement for deflection ductility of flat plates. ACI Structural Journal, 87(6), 696–705. doi:10.14359/2988.

Broms, C. E. (2000). Elimination of flat plate punching failure mode. ACI Structural Journal, 97(1), 94–101. doi:10.14359/838.

Eom, T. S., Kang, S. M., Choi, T. W., & Park, H. G. (2018). Punching shear tests of slabs with high-strength continuous hoop reinforcement. ACI Structural Journal, 115(5), 1295–1305. doi:10.14359/51702231.

Beutel, R., & Hegger, J. (2002). The effect of anchorage on the effectiveness of the shear reinforcement in the punching zone. Cement and Concrete Composites, 24(6), 539–549. doi:10.1016/S0958-9465(01)00070-1.

Yang, Y., Li, Y., Guan, H., Diao, M., & Lu, X. (2021). Enhancing post-punching performance of flat plate-column joints by different reinforcement configurations. Journal of Building Engineering, 43, 1–17. doi:10.1016/j.jobe.2021.102855.

Hugo Dalosto de Oliveira, V., Jorge Nery de Lima, H., & Sales Melo, G. (2022). Punching shear resistance of flat slabs with different types of stirrup anchorages such as shear reinforcement. Engineering Structures, 253, 113671. doi:10.1016/j.engstruct.2021.113671.

Ghali, A., Neville, A. M., & Brown, T. G. (2017). Structural Analysis: A unified classical and matrix approach (6th Ed.). CRC Press, Boca Raton, United States. doi:10.1201/9781315273006.

Einpaul, J., Brantschen, F., Ruiz, M. F., & Muttoni, A. (2016). ¬¬Performance of Punching Shear Reinforcement under Gravity Loading: Influence of Type and Detailing. ACI Structural Journal, 113(4). doi:10.14359/51688630.

ANSYS Mechanical APDL Manual Set. (2019). ANSYS Software Company, Pennsylvania, United States.


Full Text: PDF

DOI: 10.28991/CEJ-2022-08-09-015

Refbacks

  • There are currently no refbacks.




Copyright (c) 2022 Rasha Mabrouk, Gehad Younis, Osman Ramadan

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
x
Message