PROPOSED CORRECTION FACTORS for PUNCHING SHEAR CAPACITY of RC FLAT SLABS with SHEAR REINFORCEMENT

Abstract

Punching shear is the main problem facing reinforced concrete (RC) flat slabs. There are many studies that investigate the punching shear of flat slabs in the normal cases, while there are very few studies that investigate circular flat slabs supported on circular columns. This paper investigates the effect of: (1) steel shear studs; (2) steel stirrups; (3) main reinforcement details and (4) shear reinforcement arrangement on the punching shear resistance of circular RC flat slabs. An experimental program was conducted by the authors and the obtained results are compared with the numerical results using ANSYS V. 15, as well as the analytical results using the American and the Egyptian codes of standards. The obtained results show that punching shear strength increased when using steel shear reinforcement (studs and stirrups) by 9% to 57%.Toughness and displacement ductility improved by 31% to 333% and 85 to 121%, respectively. Both codes overestimate the ultimate failure load for the range of the studied variables in this research and not in general.

Performance of Reinforced Concrete Flat Slabs Having GFRP Gratings

“…Compared to previous formulations, the suggested empirical method gives more accurate predictions of the punched shear resistance of internal FRP-reinforced slab column connections throughout the whole range of examined parameters. Elmoien et al [18] studied experimentally and analytically the punching behavior of internally strengthened R.C. circular flat slabs using different techniques.…”