Tests of Slab-Column Connections Subjected to Reversed Cyclic Moments in Addition to Different Levels of Gravity Shear Load

Abstract:

Reinforced concrete flat slab-column structures are widely used because of their practicality. However, this type of structures can be subjected to punching-shear failure within the slab-column connections. Without shear reinforcement, the slab-column connection can undergo brittle punching failure, especially when the structure is subjected to lateral loading in seismic zones. This research is a part of an extensive investigation about the punching shear behaviour of interior RC slab-column connections under seismic loading. The main objective is to discuss the effect of the gravity shear level on the punching shear behaviour[1].The current paper represents only the results of the first four tested specimens without shear reinforcement. The first specimen was tested subjected to vertical gravity load only without cyclic loading while the other three specimens were tested under different vertical loads V which was kept constant during testing in addition to a reversed displacement controlled cyclic loading which was increased up to punching shear failure. The gravity load V was chosen as 0.4, 0.6 and 0.8 V₀ respectively, where V₀ is the vertical load causing punching shear failure according to ACI318-14[2]. All tested specimens have the same slab dimensions of 2000x2000mm, slab thickness 200mm, flexural reinforcement ratio of 1.62% and the same column dimensions 250mm x 250mm. Finally, the experimental results are analyzed and compared to international codes such as American Code ACI318-14 and Euro Code EC2-2004[3]. In light of these results, some preliminary conclusions are presented.

• Periodical: Solid State Phenomena (Volume 292)
• Pages: 146-152
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.292.146
• Online since: June 2019
• Authors: Amr Abdelkhalik, Tamer H.K. Elafandy, Amr Abdelrahman, Alaa Sherif*
• Keywords: Displacement Control, Gravity Shear Ratio, Interior Slab-Column Connections, Punching Shear, Reversed Cyclic Lateral Load, Seismic Loading

References

[1] Robertson, I., and Durrani, A. J., Gravity load effect on seismic behavior of interior slab-column connections,, ACI Structural Journal, vol. 89, no. 1, 37–45, (1993).

DOI: 10.14359/1282

[2] ACI 318-14, Building Code Requirements for Structural Concrete and Commentary,, American Concrete Institute, Farmington hills, (2014).

[3] European Standard, Eurocode 2: Design of concrete structures,, CEN, European Standard, (2004).

[4] Megally, S., and Ghali, A., Punching Shear Design of Earthquake-Resistant Slab-Column Connections,, ACI Structural Journal, 97, 5, Sept.-Oct. 2002, pp.720-730.

DOI: 10.14359/8807