High displacements in 1D elements frame, Hypermesh

Question

I have made a frame consisting of 1D elements, ref. horizontal frame 01.png. The frame is appr. 10 m x 7 m, and the beams are made from GRP. The frame is suspended from six lines, assumed to have no mass, and is only subjected to gravity.

I have made a non-linear static analysis, and my impression is that the displacements in one corner are way too high, ref. horizontal frame 02.png and horizontal frame 03.png. It is as if one connection of the frame is hinged. It is not, ref.  horizontal frame 04.png.

How can I check if I have modelled the connections between the 1D elements correctly? Anything else I should check?

Btw, I'm using Hypermesh 2026 and Optistruct.

BR

Arnt-Lennard Fuglestad

horizontal frame 01.PNG

horizontal frame 02.PNG

horizontal frame 03.PNG

horizontal frame 04.PNG

Arnt · Answer

Thanks! I have done a modal analysis now, and I'm starting to think that the results I got from the static analysis aren't that bad!

Rajashri_Saha · Answer

Hi,

You can do a modal analysis to see the behaviour and mode shape.

As I saw the pic, you have constrained the frame only one side. can you put some constraints in the other side too and check if that helps?

Thanks

Rajashri