topic Re: Modeling a Panel plus its frame - Facade system in Robot Structural Analysis Forum

Modeling a Panel plus its frame - Facade system

tommasovidali94 — Mon, 09 Mar 2020 09:57:13 GMT

Hello everyone,

I m trying to model a facade system composed of an aluminum panel and its frame.

I have created a model composed of 4 bars (the four edges of the frame) and a panel. I have defined the panel as a 4 mm thick deck slab (two-way direction).

When I apply a uniformed distributed load on the system, the panel does not behave as it should for the following reason:
- firstly, since the applied load is downward the maximum deflection of the panel should be in the center and downward
-secondly, the deflection magnitude is not comparable to a real value

I don´t know what is wrong in the model so I appreciate any correction.

I attached the model down here.

Re: Modeling a Panel plus its frame - Facade system

Krzysztof_Wasik — Mon, 09 Mar 2020 11:54:14 GMT

Hi @tommasovidali94

I think you should use shell calculation model instead of deck slab.

Deck slab calculation model transfers loads from panel to supporting beams using tributary method.

So loads are applied to beams (frame) and panel deflection depends on beam deformation only.

See attached screenshot:

Re: Modeling a Panel plus its frame - Facade system

tommasovidali94 — Mon, 09 Mar 2020 12:26:07 GMT

Thanks for your reply! You are right!

The only thing is that when i apply a load of 0.72 kPa to the system the model gives a maximum deflection of the panle way lower than the one calculated with the plate theory.

Precicely, if I consider a fully simply supported beam along all the 4 edges of the panel I have the following maximum deflection:

- Robot Model : 25,78 mm

- Plate theory: 73.825 mm

I dont know who to explain that and i wondering if there is no way to have a exact analysis of a thin plate with Robot, What do you think about that?

See attached images

Re: Modeling a Panel plus its frame - Facade system

Krzysztof_Wasik — Mon, 09 Mar 2020 12:53:09 GMT

Hi @tommasovidali94

Your model still have frame around panel. It does not correspond to model used in analytical method.

In analytical method results does not depend on Poisson ratio as well.

When model is calculated without beams, results are similar to analytical method but depends on material Poisson ratio

model 1 with beams

model 2 ni=0,35 (default Poisson ratio) - no beams

model 3 ni=0,001 - no beams

model 4 ni =0,1 - no beams