topic Re: Difference between max plate and shell results in table compared to panel cu in Robot Structural Analysis Forum

Difference between max plate and shell results in table compared to panel cut?

skellyRSA2023 — Fri, 10 Aug 2018 11:25:28 GMT

Hi,

I have taken plate and shell results from the results table for there maximum and minimum loading along a wall panel Axial Dead, Axial Live and Max and Min Wind Axial Load (top and bottom envelope) and compared these with the panel cut for the same panel in kN/m. Its seems that for the axial Dead and Live loads there is a massive discrepancy between the plate and shell results and panel cuts for the same loading criteria ? however the wind max and min (top and bottom envelopes) match each other? is there some explanation for this, or am I interpreting this incorrectly ? see attached pdf with a number snapshots comparing the different results.

Thanks,

Simon.

Re: Difference between max plate and shell results in table compared to panel cu

Rafacascudo — Fri, 10 Aug 2018 17:36:01 GMT

Hard to say without having the model

Re: Difference between max plate and shell results in table compared to panel cu

Artur.Kosakowski — Mon, 13 Aug 2018 08:30:05 GMT

Hi @skellyRSA2023

Make sure that you defined the cut slightly above or below the slab level.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

Re: Difference between max plate and shell results in table compared to panel cu

skellyRSA2023 — Mon, 13 Aug 2018 14:36:43 GMT

Artur,

I have saved a substructure of the model at the below wetransfer download link, as the model is fairly large. The panels which differ for the load combination "total permanent load" are panel 104 and 107 when comparing the panel cut results along the bottom of the panel at the lowest support level (0.000m) and the plate and shell results (Nyy in automatic direction in kN/m) for the same load combination there seems to be a serious difference in the results, if you could have a look it would be appreciated.

Download link https://we.tl/WDFZaeyEG0

Thanks,

Simon.

Re: Difference between max plate and shell results in table compared to panel cu

Artur.Kosakowski — Tue, 14 Aug 2018 09:53:51 GMT

Hi @skellyRSA2023

The ULS+ and ULS- are to display the envelopes of values not the envelopes of integrated values.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

Re: Difference between max plate and shell results in table compared to panel cu

skellyRSA2023 — Tue, 14 Aug 2018 12:54:21 GMT

Artur,

I am not too sure if I explained myself correctly, the question was basically why there is such a difference for the same load combination (axial permanent load) between the plate and shell results (Nyy in kN/m - automatic direction) and the panel cut (Nyy in kN/m - automatic direction) ? I have attached a pdf with snapshot which shows the comparison. I was trying compare maximum results in kN/m under pier location.

Thanks,

Simon.

Re: Difference between max plate and shell results in table compared to panel cu

Artur.Kosakowski — Tue, 14 Aug 2018 15:01:48 GMT

Hi Simon,

Mind to check the same thing

If one or more of these posts answered your question, please click Accept as Solution on the posts that helped you so others in the community can find them easily.

Re: Difference between max plate and shell results in table compared to panel cu

skellyRSA2023 — Tue, 14 Aug 2018 15:24:38 GMT

Artur,

I see that is the maximum load for that load combination based on a cluster of nodes which has been factored up to kN/m in Nyy direction then. with that in mind then what is the best and quickest way to get a maximum linear load under the pier of a wall panel in kN/m ? Panel cuts under every panel or is there a way of isolating the support nodes at the bottom of a panel to give the maximum or is there a way of getting these in table format? as I was using the Plate and shell results to get these however as you have pointed out this is not the case as some can be way over what is actually applied in kN/m.

Thanks,

Simon.

Re: Difference between max plate and shell results in table compared to panel cu

skellyRSA2023 — Thu, 16 Aug 2018 09:32:37 GMT

I think if you take panel cut between two points, parallel to axis (x or y) between each side of the individual piers, then this will give you the reduced force in z direction for the pier panel cut only shown as Nyy (automatic direction) thus this would be the easiest way I find.

Re: Difference between max plate and shell results in table compared to panel cu

Artur.Kosakowski — Thu, 16 Aug 2018 09:48:33 GMT

Hi @skellyRSA2023

If you define the wall as two 'side' panels and the third above the opening you will have this information in the reduced results for panels too.

Re: Difference between max plate and shell results in table compared to panel cu

skellyRSA2023 — Thu, 16 Aug 2018 09:52:07 GMT

yes, but then it would take a lot longer to draw model as the building elevation is covered in window openings. However, yes it would work.