In order to investigate the shear behavior of coral aggregate reinforced concrete beam (CARCB), the different concrete strength, steel types affect the shear behavior of CARCB was studied, the calculation formula of shear capacity (Vcs) and numerical analysis model of CARCB was proposed. The results show that: All kinds of CARCB have inclined section suitable reinforcement failure, the failure law of CARCB and ordinary aggregate reinforced concrete beam (OARCB) was basically the same. Considering stirrups corrosion and nonlinear mechanical properties characteristic of coral aggregate concrete (CAC), the Vcs calculation formula of CARCB was proposed, and its applicability in C25 ∼ C60 CARCB was verified, its accuracy was 26% and 34% higher than GB50010–2020 and JGJ/T 12–2019, respectively. A numerical analysis model suitable for describing the shear behavior of CARCB was proposed based on K&C (Karagozian & Case) theory, and its applicability in C25 ∼ C60 CARCB was verified, it was found that this model can well describe the whole process of CARCB inclined section failure, and the errors between simulated and measured values of Vcr, Vcs and midspan deflection are 0∼18%. In addition, the Vcs obtained by the numerical model is 3% more accurate than the calculation formula, indicating that the numerical model can effectively distinguish the variation law of shear behavior of CARCB.
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