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 LL1.2 DL +1.2 LL +1.2 WLX1.2 DL +1.2 LL +1.2 WL-X1.2 DL +1.2 LL +1.2 WLZ1.2 DL +1.2 LL +1.2 WL-Z1.2 DL +1.2 LL +1.2 ELX1.2 DL +1.2 LL +1.2 EL-X1.2 DL +1.2 LL +1.2 ELZ1.2 DL +1.2 LL +1.2 EL-Z1.5 DL + 1.5 WLX1.5 DL + 1.5 WL-X1.5 DL + 1.5 WLZ1.5 DL + 1.5 WL-Z1.5 DL + 1.5 ELX1.5 DL + 1.5 EL-X1.5 DL + 1.5 ELZ1.5 DL + 1.5 EL-Z0.9 DL + 1.5 ELX0.9 DL + 1.5 EL-X0.9 DL + 1.5 ELZ0.9 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 STATISTICSPRINT ELEMENT INFORMATION ALLPRINT MATERIAL PROPERTIES ALLLOAD LIST ALLPRINT SUPPORT REACTION LIST 1 TO 10PRINT ELEMENT FORCE ALLPRINT STORY DRIFT
7. what value of (n) is sufficient in P DELTA (n) ANALYSIS SMALL DELTA?
I am new here in this commnity but using stadd a long time. I have very urgent qurrey, can you help?
Pdelta with repeat load command not fuctioning for eqarthquack load.
LOAD 1 SEISMIC LOAD IN X DIR [EQX]
LOAD 22 3.0*EQZREPEAT LOAD2 3.0
PDELTA 2 ANALYSIS SMALLDELTA PRINT LOAD DATA
MEMBER LOAD JT FX FY FZ MX MY MZ
475 1 148 -14.75 -18.56 1398.45 44591.81 -27316.19 151.53 213 14.75 18.56 -1398.45 -844.36 -8127.52 -151.53 22 148 0.00 0.00 0.00 0.00 0.00 0.00 213 0.00 0.00 0.00 0.00 0.00 0.00 repeat load with 3x EQX should be multiple of load case 1 value but here showing zero.
How to solve?