Experimental study and numerical analysis on shear behavior of coral aggregate concrete beams with different types of steel bar

The shear behavior of CACB with different types of steel bar was studied by combining experimental and numerical analysis methods, and a numerical analysis model suitable for describing the shear performance of CACB was established, and the variation law of the shear performance of CACB was clarified. The results show that: the type of steel bar has a great influence on the shear performance of CACB, because ordinary steel bars are easy to rust, while stainless steel bars and coated steel bars can effectively inhibit the corrosion of steel bars. When the shear failure of CACB occurs, the strain of ordinary steel bars is higher than that of organic newly coated steel bars. In addition, a numerical analysis model of CACB shear performance based on K&C (Karagozian & Case) theory was proposed to verify the applicability of the model in different types of C60 CACB steel bars, considering that complex stresses such as tension, shear and compression existed simultaneously under load. It is found that the numerical model can well analyze the whole process of inclined section failure, deflection and shear capacity of CACB, and its simulation accuracy is 63% and 31% higher than that of JGJ/T 12-2019 and GB 50010-2020, respectively, indicating that the numerical model can effectively characterize the change law of shear performance of CACB.