Concrete Design > Cracking Factors prompts you with the following dialog.
This command is also available from Create (or Modify) > Member Properties > Cracking Factors. It allows you to assign cracking factors to selected beams, columns, and plates. Cracking factors apply only to bending stiffness of members and shell elements.
Note: Cracking factors are not considered by the program unless you check the option “Use cracked section properties (Icr) for members and finite elements” in Analysis > Analysis Options. Analysis results are cleared after assignment of cracking factors.