I AM TRYING TO USE NOTIONAL LOAD IN THE LRFD DESIGN. CAN ANYBODY CONFIRM IF I HAVE FORMED THE COMBINATION CORRECTLY?
PLEASE ALSO CLARIFY IF I HAVE TO DO P DELTA ANALYSIS THEN THE COMMAND FOR THE SAME IS PERFORM PDELTA ANALYSIS AND NOTHING ELSE REQUIRED.
*PRIMARY LOAD CASES
LOAD 1 DEAD LOAD (DL)
JOINT LOAD
13 TO 16 29 TO 32 45 TO 48 61 TO 64 FY -100
LOAD 2 LIVE LOAD (LL)
13 TO 16 29 TO 32 45 TO 48 61 TO 64 FY -50
LOAD 3 WIND LOAD (WL)
MEMBER LOAD
1 TO 100 UNI GX 1.8
101 TO 201 UNI Y .8
LOAD 300: DEAD NOTIONAL LOAD
NOTIONAL LOAD
1 X 0.002
LOAD 301: LIVE LOAD NOTIONAL LOAD
2 X 0.002
*SUPPOSE WE HAVE THE FOLLOWING LOAD COMBINATION
*1.4DL+NL
*1.4DL-NL
*1.2DL+1.6LL+NL
*1.2DL+1.6LL-NL
*1.2DL + 0.5LL +1.6WL+NL
*1.2DL + 0.5LL -1.6WL-NL
*1.2DL +1.6LL + 0.8WL+NL
*1.2DL +1.6LL- 0.8WL-NL
*0.9DL +1.6WL+NL
*0.9DL -1.6WL-NL
*FOLLOWING ARE THE LOAD COMBINATION WITH NOTIONAL LOADS
* (COMMENT: LOAD COMBINATION 500 SHOULD NOT BE USED)
LOAD 500:1.4DL+NL
REPEAT LOAD
1 1.4 300 1.4
LOAD 501:1.4DL-NL
1 1.4 300 -1.4
LOAD 502:1.2DL+1.6LL+NL
1 1.2 2 1.6 300 1.2 301 1.6
LOAD 503: 1.2DL+1.6LL-NL
1 1.2 2 1.6 300 -1.2 301 -1.6
LOAD 504: 1.2DL + 0.5LL +1.6WL+NL
1 1.2 2 0.5 3 1.6 300 1.2 301 0.5
LOAD 505: 1.2DL + 0.5LL-1.6WL-NL
1 1.2 2 0.5 3 -1.6 300 -1.2 301 -0.5
LOAD 506:1.2DL +1.6LL + 0.8WL+NL
1 1.2 2 1.6 3 0.8 300 1.2 301 1.6
LOAD 507: 1.2DL +1.6LL- 0.8WL-NL
1 1.2 2 1.6 3 -0.8 300 -1.2 301 -1.6
LOAD 508: 0.9DL +1.6WL+NL
1 0.9 3 1.6 300 0.9
LOAD 509: 0.9DL -1.6WL-NL
1 0.9 3 -1.6 300 -0.9
Yes the REPEAT LOADs have been specified correctly. The PDELTA analysis command is PDELTA nn ANALYSIS or PDELTA nn ANALYSIS SMALLDELTA ( both are the same ) where "nn" stands for the number of iterations. Using about 20 iterations is fine. In other words you can use PDELTA 20 ANALYSIS or PDELTA 20 ANALYSIS SMALLDELTA as the analysis command.
Thanks SYE for confirmation.
Now I want to use REPEAT LOAD to PERFORM DIRECT ANALYSIS LRFD ( without Reference load) to avoid typing for every loads
1 X 0.0024 2 X 0.0032 and so on PDF
But the program does not run with repeat load in Direct analysis.Can you advise?
REPEAT LOADs should work fine with DIRECT ANALYSIS. Must be something in your file that is causing the errors. Please upload the file and we will take a look.