Experimental study and numerical analysis on shear behavior of coral aggregate concrete beams with different types of steel bar
摘要
Against the backdrop of the Belt and Road Initiative, engineering development and construction in tropical island areas along its routes have been accelerated, requiring a large amount of building materials. However, local traditional building material resources are lacking, while local coral, seawater, and other resources are abundant. Therefore, in the construction of island and reef projects, such as port terminals and roads, it is of great importance to prepare coral aggregate concrete beams (CACBs) on–site using coral, coral sand, and seawater. However, in the tropical marine environment with high wind, humidity, temperature, and radiation, the reinforcing bars inside CACBs are highly prone to rust, threatening the safety of structures. The shear failure of reinforced concrete beams is a typical brittle failure, and its failure risk is much greater than that of the same type of bending failure. Recently, numerical simulation technology has been widely used in the engineering field. Compared with traditional testing methods, it has the advantages of repeatability, strong controllability, low cost, and high time efficiency. Therefore, conducting research on the shear performance of different types of reinforcing bar CACBs by combining experiments and numerical analyses is of great scientific and engineering importance for the engineering construction and restoration of tropical islands and reefs. This study conducts experimental research on the shear performance of CACBs with different types of reinforcing bars through a combination of experiments and numerical simulations. Based on the experimental results, the constitutive model parameters of CACBs were determined, and a numerical analysis model of the shear performance of CACBs based on the Karagozian & Case (K&C) theory was established to analyze its crack development, failure deformation, and shear bearing capacity. Relationships such as the load–deflection curve and load–reinforcement strain were establishe