"Structure is unstable" -Recommendations to find the problem
"Structure is unstable" -Recommendations to find the problem
(OP)
I am designing - for education- a 3D box truss of three similar(but not exactly the same) repeat sections.
If software is giving me the warning "Structure is unstable" .
Is there any systematic method of finding the problem?
The computer screen structure looks "good".
The software is "Dr. Frame".
Thanks
If software is giving me the warning "Structure is unstable" .
Is there any systematic method of finding the problem?
The computer screen structure looks "good".
The software is "Dr. Frame".
Thanks





RE: "Structure is unstable" -Recommendations to find the problem
corus
RE: "Structure is unstable" -Recommendations to find the problem
Good Luck
Thomas
RE: "Structure is unstable" -Recommendations to find the problem
Good luck!
-Brian
RE: "Structure is unstable" -Recommendations to find the problem
A systematic method of finding the problem would be to keep applying constraints until the model runs and then deduce the offending joint. Unless of course Dr Frame does frequency analysis when analysis of the mode shapes would be easier.
RE: "Structure is unstable" -Recommendations to find the problem
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.