Keywords : Punching shear
journal of kerbala university,
Volume 6, Issue 4, Pages 88-100
The main purpose of this study is to evaluate the effect of punching shear strength on the behavior of self compacting reinforced concrete two-way slab specimens which have different types of openings. Seven slabs were prepared for this matter divided into two groups, group (A) consists of four slabs, one without opening (S1) and three with square openings (S2,S3, and S4) while group (B) consists of three slabs with circle opening (S5,S6, and S7). The different parameters included in this study are; shapes of opening (square opening, circular opening) and position of opening (for punching failure). The constant parameters considered are; concrete type (self compact) and steel reinforcement ratio. Some of conclusions in this study are; the ultimate punching shear strength of the slab with the larger opening is less than that with smaller one and at the edge for square opening, and the ultimate load capacity for slab specimens were decreased significantly when opening existed, so that the slabs in group (A and B)showed decreasing of the original load of slab (S1), of (38.9%, 44.4%, 33.3%, 30.6%, 38.9%, and 44.4%) for slabs: (S2, S3, S4, S5, S6, and S7) specimens respectively .The percentage of reduction depends mainly on size and position of opening.