Hello everyone,
I am a new user for STAAD. I am doing a p-delta analysis to a tent structure, whose structural components include steel tubing frame and steel tension cables. I used REPEAT LOAD for the load combinations. Previously, the result of load combinations have abrupt change in the steel design code from analysis of a single primary load with identical loads. The results are not converging with the increase of # of iterations.
Then I learned that I have to reset the stiffness matrix by using "CHANGE" command after running p-delta analysis to each of the load combinations. Now the steel design result is the same as that by analysis of a single identical primary load. However, the result of steel design code only have record of the very last load cases, that is the 33rd one. The program was able to obtain other result such as displacement, reaction forces and beam forces for all of the load cases.
I am wondering if there is method to retrieve the steel design ratio compliance result after each run of the load case. Otherwise I have to separate the analysis into a total of 33 load cases. I am posting my load analysis code here:
LOAD 8 LOADTYPE None TITLE LOAD COMBINATION 1
REPEAT LOAD
1 1.25 2 1.5 6 0.4
PDELTA 1 ANALYSIS PRINT ALL
PARAMETER 2
CODE CANADIAN
TRACK 2 MEMB ALL
PARAMETER 3
CODE CANADIAN
FYLD 355 ALL
CHECK CODE AL
CHANGE
LOAD 9 LOADTYPE None TITLE LOAD COMBINATION 2
REPEAT LOAD
1 1.25 2 1.5 7 0.4
PDELTA 1 ANALYSIS PRINT ALL
PARAMETER 2
CODE CANADIAN
TRACK 2 MEMB ALL
PARAMETER 3
CODE CANADIAN
FYLD 355 ALL
CHECK CODE AL
CHANGE
.....
.....
LOAD 33 LOADTYPE None TITLE LOAD COMBINATION 10
REPEAT LOAD
1 1.25 2 1.5
PDELTA 1 ANALYSIS PRINT ALL
PARAMETER 2
CODE CANADIAN
TRACK 2 MEMB ALL
PARAMETER 3
CODE CANADIAN
FYLD 355 ALL
CHECK CODE ALL
FINISH
Thanks a lot!