Parameters affecting diagonal cracking behavior of reinforced concrete deep beams

In this study, an experimental study is performed to investigate the effects of section height (h), ratio of shear span to effective depth (a/d) and compressive strength of concrete (f(c)(')) parameters on diagonal cracking and crack width behavior of RC deep beams after making comprehensive literature research. Effect of shear reinforcement on this behavior is also investigated. Eleven different RC deep beam specimens with or without shear reinforcement are tested under a 3-point loading with a simple support condition. Firstly, the test results reveal that the load carrying capacity of the specimens increases with an increase in section height. Very minor increments in mid-displacements are determined as well. Small increments are experienced in crack widths as h increases. Secondly, an increase in the shear strength of the tested members is obtained as a/d decreases. A small decrease in displacement values is observed with a brittle behavior as well. Moreover, diagonal crack widths increase along with an increment in a/d ratio. Thirdly, an increment of makes a significant contribution to the shear strength of RC deep beams. However, it results in a decrease in maximum diagonal crack widths. Lastly, shear reinforcement makes a very significant contribution to shear strength due to confining struts.