SAFE: Punching shear results are displayed as a ratio of maximum calculated shear with respect to capacity. A ratio above 1.0 would indicate capacity was exceeded somewhere along the critical section. The ratio is displayed for each column and each point load. A notation of N/C means the value was not calculated by the program. From my experience i have found that SAFE punching shear calculation are conservative, therefore i always check manually if SAFE displays ratio more than 1.0.
Punching Shear Ratio in SAFE