To instruct the program to perform a second-order, P-Delta analysis, use the following procedure.

1. Either:

   select the Analysis page

   or

   on the Analysis and Design ribbon tab, select the Analysis Commands tool in the Analysis Data group
   
   

   The Analysis/Print Commands dialog opens.
2. Select the PDelta Analysis tab.
3. Type the Number of Iterations to use.
4. (Optional) Check the Use Geometric Stiffness (Kg) option to include stiffening effects of the KG matrix. Refer to Notes for Stress Stiffening Matrix (Option 2) for details on this option.
5. Check the Small Delta option to include effects of member deflection (i.e., P-δ effects). This option is recommended. Clear this option to only consider effects of structure drift (i.e., P-Δ effects).
6. Select the Print Option you want to use.
7. Click Add. The PDetla Analysis command is added to the input file.