Shear investigation of self compacted concrete at different shapes

Twenty seven self-compacted concrete (SCC) beams at different shaped were designed and tested to determine the effect of using SCC on the shear strength under two concentrated loads. The tested beams were divided into three groups according to the shape of the section rectangular sections, T-sections and I-sections. Each group was divided into three series, according to the clear San to the effective depth ratio (Ln/d). Each series beams have the same longitudinal steel ratio, cross section area and clear span to effective depth ratio, but have different values in compressive strength (fc').It was found that The ultimate shear strength predicated from ACI 318M-11 is conservative prediction than the experimental values, The ultimate shear strength of SCC rectangular beams increase about 16.5%.35.245%and 25.665% when the compressive strength increased from (29.36 to 49.2 MPa) at clear span to effective ratio (ln/d) 5.84, 5.5 and 5.05
respectively, The ultimate shear strength of SCC T-beams increase about 28.57%.10.714%and 10.17% when the compressive strength increased from (29.36 to 49.2 MPa) at clear span to effective ratio (ln/d) 5.84, 5.5 and 5.05 respectively, while The ultimate shear strength of SCC Ibeams increase about 14.38%.15.55%and 10.746% when the compressive strength increased from (29.36 to 49.2 MPa) at clear span to effective ratio (ln/d) 5.84, 5.5 and 5.05 respectively . The clear span to the effective depth ratio (ln/d) has a significant influences on the ultimate shear strength of SCC beams, The ultimate shear strength of SCC rectangular beams increased about 21.58%,32.9% and 32.01% when the clear span to the effective depth (ln/d) decreased from (5.84 to 5.05) at compressive strength () 29.36, 41.42 and 49.2 MPa respectively, The ultimate shear strength of SCC T-beams increased about 40.47%,34.73%and 20.37% when the clear span to the effective depth (ln/d) decreased from (5.84 to 5.05) at compressive strength () 29.36, 41.42 and 49.2 MPa respectively, while The ultimate shear strength of SCC I-beams increased about 44.72%,45.19%and 40.13% when the clear span to the effective depth (ln/d) decreased from (5.84 to 5.05) at compressive strength () 29.36, 41.42 and 49.2 MPa respectively.