problem with releases in 3d model

[Anonymous]

Hi! I would like to ask about the instability problem which occurs in this model. And how in fact i should design releases in the model particularly where adjoing bars at node  are more than 2 (node 48, node 46). Thanks in advance.

http://www.2shared.com/file/pt5xhBCX/Sgrada_3d.html    my file

[Artur.Kosakowski · Accepted solution]

The instability of type 3 means that there is large difference in stiffness among the elements of the model. In this particular case it is due to use of RLink elements to model rigid links. If you change solver to skyline (to allow not to use RLinks) and change the mass type to consistent for the modal case no instability will be reported.

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[Anonymous]

Thanks a lot for the answer.