topic Re: Strut and tie and bar elements in Robot Structural Analysis Forum

Strut and tie and bar elements

JPNR87 — Thu, 16 Jan 2020 10:12:09 GMT

Hi,

how is best way to model STM elements in RSA. I'll draw with simple bars. Is it reasonable to change elastic modulus to infinitely high or....?

Thanks

Rafacascudo — Thu, 16 Jan 2020 12:55:52 GMT

Can you give an example of what you want/need?

JPNR87 — Thu, 16 Jan 2020 13:08:36 GMT

I want to compile simple 3d model of bar members to get tension compression forces. Further STM "hand"-calcuculations are made.

Rafacascudo — Thu, 16 Jan 2020 14:22:20 GMT

You can get results like these on the picture , but for such a 3d model it is not possible to have only truss bars . RSA would report it as unstable.

I managed to get similar results, regarding axial forces ,by using bar elastic releases for the upper bars(all but columms).

Using very weak springs you can have a stable structure without having significant bending moments.

model attached