Reaction Mismatch - Check Val not equal to Zero

[PaulGrimes2282]

In my model the check value in the reactions case is greater than zero - i.e. the sum of the forces is greater than the sum of the reactions by around 7800kN (out of a total sum of forces of 72600kN). i am also getting horizontal reactions with no horizontal forces applied which don't sum to zero, and huge moments about pinned supports.

I am getting some nodal instabilities as pre-analysis warnings which shouldn't be unstable - all have at least one point of fixity. I also had a couple of nodal instabilities at pinned supports, where i have now used fixed supports to get rid of the instability.

I can't attach the model file as it is too large - is there another place that i can upload it adn link to?

Thanks!

[Rafal.Gaweda]

Try wetransfer.com or filemail.com

If not I will create ftp for you

[PaulGrimes2282]

does this work for you?

Can't see the download button? Then click here to download your file.

[Rafal.Gaweda · Accepted solution]

1. Do not use kinematic links.

2. Use recommended meshing parameters and correct meshes

Take a look at message 3 in this thread:

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Structure-verification/m-p/3334637/highlight...

After correcting coherence of meshes I think you should remove releases from columns 952 1424 or define them properly not producing instabilities in model

COrrected model:  http://wtrns.fr/ospazeccgHWsNg

[PaulGrimes2282]

Thank you so much for looking at this - I will have a check through the model ASAP - i'm off on holiday at the end of today, but will try and have a look before i go, otherwise i will have a look when i get back.

thanks again.