12-11-2009, 07:20 AM
Dear Veggeta,
I run this model without change anything, it give :
* * * W A R N I N G * * *
ZERO STIFFNESS FOUND DURING SOLUTION FOR DOF UX OF JOINT 872
LOCATED AT X = 12.500000, Y = 1.500000, Z = 5.650000,
STIFFNESS MATRIX DIAGONAL VALUE SET TO 1.00E-10
* * * W A R N I N G * * *
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
CHECK THE STRUCTURE CAREFULLY FOR:
- INADEQUATE SUPPORT CONDITIONS, OR
- ONE OR MORE INTERNAL MECHANISMS, OR
- ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
- EXTREMELY LARGE STIFFNESS PROPERTIES, OR
- BUCKLING UNDER P-DELTA LOADS (IF ANY), OR
- AN EIGEN SHIFT (IF ANY) ONTO A NATURAL FREQUENCY
I fixed it because some of stair beams are not conected to the bordes (LOCATED AT X = 12.500000, Y = 1.500000, Z = 5.650000)
May I ask you what kind of material Durock? Can you explained what is that material..
because you run with UBC respons spectrum with Scale Factor = 0,3...
regards,
robertsasmita
I run this model without change anything, it give :
* * * W A R N I N G * * *
ZERO STIFFNESS FOUND DURING SOLUTION FOR DOF UX OF JOINT 872
LOCATED AT X = 12.500000, Y = 1.500000, Z = 5.650000,
STIFFNESS MATRIX DIAGONAL VALUE SET TO 1.00E-10
* * * W A R N I N G * * *
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
CHECK THE STRUCTURE CAREFULLY FOR:
- INADEQUATE SUPPORT CONDITIONS, OR
- ONE OR MORE INTERNAL MECHANISMS, OR
- ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
- EXTREMELY LARGE STIFFNESS PROPERTIES, OR
- BUCKLING UNDER P-DELTA LOADS (IF ANY), OR
- AN EIGEN SHIFT (IF ANY) ONTO A NATURAL FREQUENCY
I fixed it because some of stair beams are not conected to the bordes (LOCATED AT X = 12.500000, Y = 1.500000, Z = 5.650000)
May I ask you what kind of material Durock? Can you explained what is that material..
because you run with UBC respons spectrum with Scale Factor = 0,3...
regards,
robertsasmita