Sir,

I am new for Staad Pro. Kindly elaborate about some points:

1. When We should use P Delta Analysis instead of Perform analysis?

2. Here Three options in P Delta Analysis a) Converge b) Use geometric stiffness (KG) c) Small Delta. When and how use these options?

3. It is necessary to keep seismic load cases above (before) all load cases? Means load case number 1 to 4 should be for EQ X, EQ -X, EQ Z, EQ -Z?

4. What should be the location of wind load in load cases? before or after Dead Load and Live Load cases?

5. I have some load combinations like:

1.5 DL+1.5 LL

1.2 DL +1.2 LL +1.2 WLX

1.2 DL +1.2 LL +1.2 WL-X

1.2 DL +1.2 LL +1.2 WLZ

1.2 DL +1.2 LL +1.2 WL-Z

1.2 DL +1.2 LL +1.2 ELX

1.2 DL +1.2 LL +1.2 EL-X

1.2 DL +1.2 LL +1.2 ELZ

1.2 DL +1.2 LL +1.2 EL-Z

1.5 DL + 1.5 WLX

1.5 DL + 1.5 WL-X

1.5 DL + 1.5 WLZ

1.5 DL + 1.5 WL-Z

1.5 DL + 1.5 ELX

1.5 DL + 1.5 EL-X

1.5 DL + 1.5 ELZ

1.5 DL + 1.5 EL-Z

0.9 DL + 1.5 ELX

0.9 DL + 1.5 EL-X

0.9 DL + 1.5 ELZ

0.9 DL + 1.5 EL-Z

Should I use REPEAT LOAD command for all above load combinations for P Delta analysis or I should use REPEAT LOAD command for (1.5 DL + 1.5 LL) combination and for remaining I can use load combination command?

6. How can I give these commands after P DELTA (n) ANALYSIS SMALL DELTA:

PRINT PROBLEM STATISTICS

PRINT ELEMENT INFORMATION ALL

PRINT MATERIAL PROPERTIES ALL

LOAD LIST ALL

PRINT SUPPORT REACTION LIST 1 TO 10

PRINT ELEMENT FORCE ALL

PRINT STORY DRIFT

7. what value of (n) is sufficient in P DELTA (n) ANALYSIS SMALL DELTA?