topic Re: Truss support analysis in Robot Structural Analysis Forum

Truss support analysis

Anonymous — Sun, 25 Dec 2016 08:14:59 GMT

Hi,

I'm currently analyzing a truss but I'm just wondering if it is possible to do a plate connection in the support for example a pinned support like the imaged below. If possible can you guide me how to do the support analysis.

Thanks in advance.

Re: Truss support analysis

Rafacascudo — Sun, 25 Dec 2016 14:02:08 GMT

You can try modelling the plates as FE elements panels and conecting them to the bars using rigid links

Re: Truss support analysis

Anonymous — Tue, 27 Dec 2016 06:41:24 GMT

Thanks for the quick reply

Any link or tuitorial for this sir?

Re: Truss support analysis

Rafacascudo — Tue, 27 Dec 2016 21:36:47 GMT

Something like this.

On a simple model the hole edge connected with rigid links all around (you can link all edge nodes .I linked only the polygon nodes for this example)

On a more sophisticated model you can link e hole edge with compression only bars to simulate the real contact with the support plate

Then , the results

1- vertical force on the plate for model with rigid links to the hole edge

2- vertical force on the plate for model with "compression bars only" to the hole edge

you can see that compression in the plate on the region below the hole is much larger for the model with "compression only bars " instead of rigid links to transmit the force to the plate.

I needed to add some extra supports to avoid some instabilities

models attached

Re: Truss support analysis

Anonymous — Wed, 28 Dec 2016 06:46:48 GMT

Wow thank you Rafa for the tuitorial.

I'll try to practice this and then I will give you a feedback.

Much appreciated for the time.