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Moments over supports.

8 REPLIES 8
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Message 1 of 9
PTAadrian
744 Views, 8 Replies

Moments over supports.

We have a problem where the moments over supports are showing higher results than that shown by other structural design packages, in this case Bentley RAM Concept V8i r5.0.2.

 

We have applied the "Global smoothing" as detailed here:

 

http://docs.autodesk.com/RSA/2013/ENU/index.html?url=filesROBOT/GUID-E73EA3A2-AEC8-40EA-8AC3-E7EDCA7... 

 

However, the moments over the supports are still higher than expected as the results show below. 

 

  • RAM = 94.KN.m
  • Robot (Without global smoothing) = 155.KN.m.
  • Robot (With global smoothing) = 120.KN.m

Is there an explanation for this discrepancy?

 

Screenshots of the differences are below for reference:

 

Robot no global smoothing

 

 

RAM

 

16.09.13 - RAM cut.png

 

Robot with global smoothing

 

 

Attached file:

https://www.dropbox.com/s/7jsagandoq0dxrj/8663%20-%20Robot%20Model%20-%20ST%20-%20Cladding%20Panels....

Tags (2)
8 REPLIES 8
Message 2 of 9
Rafal.Gaweda
in reply to: PTAadrian

which support (node number), which loadcase?
Screen shot are with reduced quality so I am unable to read them correctly.


Rafal Gaweda
Message 3 of 9
PTAadrian
in reply to: Rafal.Gaweda

The two screenshots are taken from the second floor over node 3000 in case 10, ULS. The increased moments over the support is not just happening locally over this support, but over all in the structure

 

Please find below attached higher quality pictures:

 

Robot no global smoothing

 

16.09.13 - Robot, no global smoothing.png

 

RAM

 

16.09.13 RAM.png

 

Robot with global smoothing

 

16.09.13 - Robot, global smoothing.png

Message 4 of 9
Rafal.Gaweda
in reply to: PTAadrian

My file: https://www.filemail.com/d/dhkytmtyqfxqvmt

 

My results:

 

99.jpg



Rafal Gaweda
Message 5 of 9
PTAadrian
in reply to: Rafal.Gaweda

We are unable to run the file due to errors in the model. Please could you post how you were able to get this result.

Message 6 of 9
Rafal.Gaweda
in reply to: PTAadrian

You do not have to run this model. It already has results.
There are no errors in it.
(Please open it in v 2013 or 2014)


Rafal Gaweda
Message 7 of 9
Rafal.Gaweda
in reply to: Rafal.Gaweda

Remark : to compare results between programs you should have the same \ very similar meshes generated in both programs. I changed meshing in my model.


Rafal Gaweda
Message 8 of 9
Jade_Cereno
in reply to: Rafal.Gaweda


@Rafal.Gaweda wrote:

My file: https://www.filemail.com/d/dhkytmtyqfxqvmt

 

My results:

 

99.jpg


Hi Rafal!!

 

How tdid you possibly do this?? I mean producing the results to be same on bentley's RAM ConcePT?? Also, is this method acceptable to the structural engineering industry?

MIT-BsCE
Message 9 of 9
Rafal.Gaweda
in reply to: Jade_Cereno


 

How tdid you possibly do this?? I mean producing the results to be same on bentley's RAM ConcePT??

 

You should have asked this 2 months ago.

As far as I remember I claculated model and presented results. 

 

Also, is this method acceptable to the structural engineering industry?


???????????

As far as I know the resposibility of the results is on the side who signs the calculations \ design. You can use any results you want \ have if you take responsinility of them. If there is a controlling office in your country it may not be that easy because you have to deliver calculations to them.



Rafal Gaweda

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