ThisMustBeAJoke
Structural
- Jan 1, 2021
- 9
Hello, been trying to design a portal, currently i am designing roof, while analyzing i am having this warning:
"Load Case : Solving Linear Stiffness from Zero (unstressed) initial conditions
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!. CHECK THE STRUCTURE CAREFULLY FOR. TO OBTAIN FURTHER INFORMATION:.
- USE THE STANDARD SOLVER, OR. - RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH. ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES "
which I think caused by releasing partial fixities.
what i done : released axial fixity of purlins and ridge , M3 for diagonals, M2 and M3 for verticals, no release at bottom or top face as a shown at picture.
what should i do for correctly releasing partial fixity? if the error not cause from that, what is your idea please help![[bigears]](/data/assets/smilies/bigears.gif "[bigears] [bigears]")
"Load Case : Solving Linear Stiffness from Zero (unstressed) initial conditions
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!. CHECK THE STRUCTURE CAREFULLY FOR. TO OBTAIN FURTHER INFORMATION:.
- USE THE STANDARD SOLVER, OR. - RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH. ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES "
which I think caused by releasing partial fixities.
what i done : released axial fixity of purlins and ridge , M3 for diagonals, M2 and M3 for verticals, no release at bottom or top face as a shown at picture.
what should i do for correctly releasing partial fixity? if the error not cause from that, what is your idea please help