The compressive strength of concrete under biaxial dynamic compression

The compressive strength of concrete under biaxial dynamic compression The compressive strength of two concretes under biaxial dynamic compressive stress was investigated. A biaxial split Hopkinson bar was used, that applied the dynamic load to the test specimen in the form of two load waves perpendicular to each other. For reference, the static compressive strengths under biaxial load with different stress ratios of the two load axes were determined in a triaxial testing machine. The results indicate a partially superposition of the two strength-increasing effects of multi-axial compressive stress and increased strain rate. In particular, clear differences can be seen in the fracture and crack pattern for the different load types.