The Effect of Varying Maximum Aggregate Size and Reinforcement Ratio on the Behavior of Reinforced Shear Key Specimens with Normal Steel Under Direct Shear
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Abstract
When designing concrete structural members subjected to different types of stresses, it is essential to optimize the contribution of all structural components. In the design of shear reinforcement for beams, the contribution of longitudinal bars to shear resistance is typically neglected, as they are mainly intended to resist bending stresses. This study investigates the influence of varying the longitudinal reinforcement ratio and maximum aggregate size on the behavior of shear key specimens. The experimental program includes nine specimens, incorporating three maximum aggregate sizes (2 mm, 4 mm, and 9 mm) and three reinforcement ratios (minimum, average, and maximum). After performing the required tests, the shear stress, slip, and dilation values were determined and compared among the specimens. The results demonstrated that increasing the maximum aggregate size enhanced the shear capacity when the reinforcement ratio was at its minimum. Conversely, when the reinforcement ratio was increased to its maximum level, the shear capacity decreased with increasing aggregate size.
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