Experimental and numerical study on dynamic mechanical properties of C60 concrete under biaxial confinement

In this study, the dynamic mechanical properties of C60 concrete under biaxial confinement were systematically investigated through experiments and numerical simulations. The experimental investigation employed a triaxial Split Hopkinson pressure bar to study the dynamic response of C60 concrete under various confining pressures (0 MPa, 5 MPa, 7.5 MPa, and 10 MPa) and high strain rates (60 s⁻¹, 90 s⁻¹, and 110 s⁻¹). The numerical simulation results were consistent with the experimental data, thereby confirming the reliability of the numerical model. The results indicated that the confinement and strain rates exerted a notable synergistic effect on the dynamic strength and damage characteristics of C60 concrete. A higher confining pressure significantly enhanced the load-bearing capacity, whereas increased strain rates further improved the dynamic performance. Energy dissipation analysis revealed a saturation effect regarding the regulation of wave propagation by the confining pressure. These findings provide essential insights into the effective application of prestressed concrete in protective structures.