Zero Stiffness Warning

[subbu1985]

Hi!!!!

I'm getting a warning in Staad Pro saying something like Zero stiffness..

What's the best way to get rid of it???

Any suggestions...

 

[RAYC1]

Add a SET PRINT 1 command before the Joint Coords by using the editor.

 

[subbu1985]

Hi Ray C1!!!!

It's working fine!!!
But why is that error arising??
What is the logic behind using that SET PRINT 1???
It'd be much helpful if u could furnish the reason for that...


Regards,
Arun.

 

[RAYC1]

The SET PRINT 1 command's only purpose is to omit the message at the users request.

It is not an error. It is rather more a note or FYI. Zero rows and zero columns (at a joint) in the global stiffness matrix can occur when trusses or releases or tension/compression-only are used by some or all of the members at a joint. The zeroes are almost always harmless but the message is printed in case the engineer is not expecting zeroes. It is possible that a wind load/floor load will generate a load at a zero dof and in effect be lost but that is rare. The Print Static Check will be out of balance in such a case.