Unkown Error and Zero diagonal Term

04-Unexpected behaviour/errors
Post Reply
Hanif Nanda
Posts: 8
Joined: 20 May 2022, 15:17

Unkown Error and Zero diagonal Term

Post by Hanif Nanda »

hello i have a problem when doing eigen analysis.
I am using truss element connectivity. Here is written a zero diagonal warning. And when I run eigen analysis the result is unknown error. Can anyone help me what is going on?
Best Regards
Hanif Nanda

Image
Image
User avatar
seismosoft
Posts: 1184
Joined: 06 Jul 2007, 04:55

Re: Unkown Error and Zero diagonal Term

Post by seismosoft »

The error means that some of the degrees-of-freedom are not connected to the structure, there is no equilibrium and the program cannot find a solution. Make sure that all the members of the model are correctly connected.
Seismosoft Support
Hanif Nanda
Posts: 8
Joined: 20 May 2022, 15:17

Re: Unkown Error and Zero diagonal Term

Post by Hanif Nanda »

I've checked the node connection and its members. When I use infrmdb there is no problem, but when I change to truss it gets an error. Do I have to set a constraint?

here's a picture of the structure when using infrmdb
Image
User avatar
seismosoft
Posts: 1184
Joined: 06 Jul 2007, 04:55

Re: Unkown Error and Zero diagonal Term

Post by seismosoft »

The truss element provides stiffness only in the translations DOFs. It seems that some of the elements are not correctly in rotation (e.g. a member that is by itself a cantilever).
Seismosoft Support
Post Reply

Return to “04-Unexpected behaviour/errors”