I believe what you are talking about is S-Steel. It is one of softwares in the structure office. Used for structure design calculation. S-Steel is used to check if the specific steel meet the code requirements. It can also check distribution of stress, deflection and moment along the steel. The input of the program can be directly import from its family software. $ X, `" s, i$ A$ ?) ~0 A# Y' T4 K5 kIt is very often used but not be used alone.