fix end beam problem

[Mohammadf]

Hi Dear all
I have modeled a simple beam with fix ends and with a gravity analysis. I can not run this model!!! it has an error."FATAL ProfileSPDLinSOE::getX - vectX == 0" but when i change one end constrain from 1 1 1 to 0 1 1 I can run it.

constraints Plain
numberer RCM
system BandGeneral
test NormDispIncr 1.e-6 10
algorithm Newton
integrator LoadControl 0.1
analysis Static
analyze 10


what is the problem? please help.

Regards

[hnaderi]

Hello Dear Friend Mohammadf

Change your Constraints Method. Use Penalty Method.
for Example:
Constraints Penalty 1e12 1e12

[Mohammadf]

Many Thanks Dear Naderi

[fmk]

the problem arose because the model had 0 degress-of-freedom when you use plain (transformationwould give similar results) and impose a constraint on the only free dof ..hence you actuall had 0 dof and hence the original error method.