The Impact of Aspect Ratio, Characteristic Strength and Compression Rebars on the Shear Capacity of Shallow RC Beams

Abstract

This paper investigates the impact of the aspect ratio, the characteristics strength of the concrete, and the compression steel ratio on the shear capacity of wide-shallow beams. An experimental program consists of seven specimens, including a control specimen, all tested under a three-point load test. Three specimens were considered for each parameter (the control specimen was included in all three variables). The experimental results were compared to the theoretical values of six different codes of practice; they were also analyzed to determine the ductility, stiffness, and dissipated energy of each specimen. The results indicated that the shear reinforcement was fully functioning until it yielded, with a minimum contribution of 55% of the total shear capacity of the specimens. The aspect ratio and the characteristic strength had a notable impact on the shear capacity of the specimens, while the compression steel ratio had a minor effect on the shear capacity, but it improved the stiffness and the ductility of the beams. Theoretical concrete shear strengths from design codes ranged between 77 and 163% of the experimental values; EN-1992 was the closest code to the experimental results. A comparison between the experimental results and predicted values using GP and EPR methods from previous research showed accuracies of 72% and 81%, respectively. Doi: 10.28991/CEJ-2023-09-09-012 Full Text: PDF

The Impact of Shear Reinforcement Amount and Arrangement on the Shear Capacity of Shallow RC Beams: An Experimental Study

“…Since all the tested beams have the same dimensions, concrete strength, and longitudinal rebars, they all have the same concrete contribution and longitudinal rebar contribution (vc+v), and only the shear reinforcement contribution (vs) is responsible for the difference in total shear strengths. Plotting the total shear strength (vu) of beams B1, B6, and B7 against their theoretical ultimate shear reinforcement strength (4 stirrups × Ash.fys) as shown in Figure 5-c showed that (vc+v) equals 1.24 MPa for all the samples, which matches the results of the first part of this research [3]. The difference between (vu) and (1.24 MPa) is (vs).…”

“…Soliman et al [3] had investigated the shear capacity of seven wide-shallow beam specimens, considering the aspect ratio, concrete compressive strength, and ratio of compression rebar. The ultimate shear strength of the specimens decreased when the aspect ratio increased from 1.66 to 5.…”