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Active Contributor
legar
Posts: 42
Registered: ‎09-24-2008
Accepted Solution

Local load on 2D bars BUG???

236 Views, 7 Replies
11-26-2013 02:53 AM

Hi,

 

Could somebody comment local load on bars?

 

Assume 2D Frame module, some local load on bars are generated incorrectly - see picture below :

 

2D local loads.png

 

Assume 3D Frame module, all local loads are generated correctly - see picture below:

 

3D local loads.png

 

Same result in ARSA 2013 Pro and ARSA 2014 Pro...

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Distinguished Contributor
mirko.jurcevic
Posts: 199
Registered: ‎01-12-2013

Re: Local load on 2D bars BUG???

11-26-2013 03:37 AM in reply to: legar

How did you manage to get that second case on the first image? I can't get that.

INTELIKA

Mirko Jurcevic M.Eng.
INTELIKA d.o.o.
www.intelika.hr
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Active Contributor
legar
Posts: 42
Registered: ‎09-24-2008

Re: Local load on 2D bars BUG???

11-26-2013 03:43 AM in reply to: mirko.jurcevic

It was simply right column of 2D portal frame generated by vertical mirror (at ridge line) of left column and left roof beam :smileyhappy:...

 

For simplicity... to show this bug, there are shown only columns.

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Distinguished Contributor
mirko.jurcevic
Posts: 199
Registered: ‎01-12-2013

Re: Local load on 2D bars BUG???

11-26-2013 03:48 AM in reply to: legar

Yes, after vertical mirroring of the column, I get the same thing.

After deleting the load, and adding new local load on the same bar, it does not respect local Z axis direction.

INTELIKA

Mirko Jurcevic M.Eng.
INTELIKA d.o.o.
www.intelika.hr
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Product Support
Rafal.Gaweda
Posts: 5,048
Registered: ‎04-26-2010

Re: Local load on 2D bars BUG???

11-26-2013 03:48 AM in reply to: legar
"As a general rule for 2D structures, loads in a local system are not rotated with a gamma angle. The same applies to the eccentricity direction of loads. "

http://docs.autodesk.com/RSAPRO/2014/ENU/filesROBOT/GUID-AA2B51CC-C722-4C9F-AE01-251A89EB8976.htm


Rafal Gaweda
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Active Contributor
legar
Posts: 42
Registered: ‎09-24-2008

Re: Local load on 2D bars BUG???

11-26-2013 04:02 AM in reply to: Rafal.Gaweda

Rafał,

 

First of all, load was applied on mirrored structure - loads was not mirrored.

Second of all... why there were no problems with local loads on mirrored roof beam but only on column.

 

And finally of all... what is original reason of this problem. Don't you really think that it is not a bug when I apply positive load in local bar system and it is applied visually and statically in negative direction of local load???

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Product Support
Rafal.Gaweda
Posts: 5,048
Registered: ‎04-26-2010

Re: Local load on 2D bars BUG???

11-26-2013 06:04 AM in reply to: legar

Program limitation described in help.

See below - column 2 created by mirror

 

loadin2d.jpg

 



Rafal Gaweda
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Active Contributor
legar
Posts: 42
Registered: ‎09-24-2008

Re: Local load on 2D bars BUG???

11-26-2013 07:02 AM in reply to: Rafal.Gaweda

Rafał,

 

For me it is rather a bug - please add it to wish list to repair in next software versions.

If it is possible to work correctly in 3D FRame... so it should be not a big problem to correct it in 2D Frame :smileywink:.

 

Actually there is another risk... that during modification of nodes coordinates in some situations changes gamma angle value and accordingly changes local load direction without any user action on loads.

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