Parametric Study for Behavior of the Punching Shear Capacity of Flat Slab Without Shear Reinforcement by The Selected Design Codes

Abstract

The system of the flat slab is widely used for the construction of structures because it has economic and functional advantages. However, a flat slab has some disadvantages as punching shear problem occurs by shear force concentrations around the column, the transfer of moments between slabs and columns creates both twisting and high local moments, and make larger deflections. Punching shear failure is one of the failure mode types on the flat slabs that lead to brittle failure without the yielding of steel with small deflections when shear reinforcement is not added. Punching shear capacity of flat slabs without shear reinforcement could be calculated by some codes. Nowadays, the most widely used codes for punching shear are Eurocode2 2004, ACI 318, and Model code 2010. The strategy of all these design codes toward punching is mainly empirical and makes use of the findings of different experimental studies. Investigation on the code functions and on the impact of individual factors on the expected punching shear capacity has been carried out through a parametric study. The impact of concrete compressive strength, tensile reinforcement ratio and size of member were also observed.

Keywords

• flat slab
• punching shear
• compressive strength of concrete
• and tensile reinforcement ratio