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. Select the P-Delta option to use for the analysis:

   Option	Details
   Use Large and Small Delta	Used to include effects of member deflection (i.e., P-δ effects). This option is recommended.
   Use Large Delta Only	Used to only consider effects of structure drift (i.e., P-Δ effects).
   Use Stress Stiffening effect of the KG matrix	Used to include stiffening effects of the KG matrix. Refer to Notes for Stress Stiffening Matrix (Option 2) for details on this option.

4. Type the Number of Iterations to use.
5. Select the Print Option you want to use.
6. Click Add. The PDetla Analysis command is added to the input file.