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. |
