topic Re: Section builder in Robot Structural Analysis Forum

Section builder

mgaafar — Thu, 31 Jan 2013 01:35:59 GMT

Hi,

I had complex section so I imported the section from CAD as Dxf and added the section to used database. when I ran the analysis, RSA gave a msg saying that torsional constant IX=0 and a small value will be assumed. so when I opened the saved section I found that I had not selected the Torsion option so I did, but it did not save it back to the user database, So I opened the user database and added the values manually and saved.

now the IX still reads zero when I right click the member and see the properties. how can I refresh or let RSA update the user defined values?

also why RSA does not calculate the wraping constant?

Thanks

Re: Section builder

Rafal.Gaweda — Thu, 31 Jan 2013 07:17:28 GMT

Send us sec file.

Re: Section builder

mgaafar — Thu, 31 Jan 2013 17:25:46 GMT

Please find attached snap shots of the model, the model, the section file and the user database file.

in summary of what I need:

1- i am not sure how to update/refresh section properties of a section if I decide to change the property in the section (.sec) file and re-save it in the user defined database. currently I have to delete the existing section and re-save it to the database.

2-why when I resave the section to the database and re-insert the section in the model it does not update its properties and retain the old property?

Thanks

Re: Section builder

Anonymous — Fri, 01 Feb 2013 08:03:26 GMT

Hi,

I have also had that issue with other section properties that I entered or changed them manually in the section database.

Try to re-add that section in the section box. You should see a message that says that this section already exists an so on...

Re: Section builder

Artur.Kosakowski — Fri, 01 Feb 2013 12:01:46 GMT

2-why when I resave the section to the database and re-insert the section in the model it does not update its properties and retain the old property?

Imagine that I edited the IPE100 section and I saved it in my user section database and I used it in the model. Then I sent you my model and you want to edit the model using the standard IPE100 section tehrefore you load it from the database after opening my file. Would you like to have my IPE100 replaced?

This is still possible but requires user's 'confirmation':

1. Select all bars with 'my' IPE100 section

2. Change their section to any other (e.g. IPE200)

3. Delete 'my' IPE100 section label from the list in the Sections dialog

4. Add standard IPE100 from the database

5. Replace IPE200 with IPE100

Re: Section builder

Rafal.Gaweda — Fri, 01 Feb 2013 13:59:15 GMT

I had complex section so I imported the section from CAD as Dxf and added the section to used database. when I ran the analysis, RSA gave a msg saying that torsional constant IX=0

Then save it to database

Re: Section builder

mgaafar — Fri, 01 Feb 2013 17:00:18 GMT

Rafal,

Thanks, I know that this will solve the torsion constant calculations but my problem that when I save it in the database it does not update the section in the model, but it seems that I will have to rename the section and reinsert it in the model.

by the way does the section builder calculates the wraping constant?

Re: Section builder

Rafal.Gaweda — Mon, 04 Feb 2013 07:56:15 GMT

Thanks, I know that this will solve the torsion constant calculations but my problem that when I save it in the database it does not update the section in the model,

take a look at message 5 above

Re: Section builder

Rafal.Gaweda — Mon, 04 Feb 2013 08:34:10 GMT

by the way does the section builder calculates the wraping constant?

Yes, for thin walled sections.

So you can create section as thin walled, calculate, then, if you need, you can convert it to thick walled section.

Re: Section builder

Anonymous — Mon, 04 Feb 2013 08:36:24 GMT

How would be the way to to this Rafal?

Re: Section builder

Rafal.Gaweda — Mon, 04 Feb 2013 08:42:27 GMT

Look below

Re: Section builder

Anonymous — Thu, 13 Jun 2013 12:05:45 GMT

Hi,

I put from a Cad a Z section. How to read a wraping constant from "Result" ?

Regards

Re: Section builder

Rafal.Gaweda — Thu, 13 Jun 2013 12:14:45 GMT

For thin walled section

http://docs.autodesk.com/RSA/2013/ENU/index.html?url=filesROBOT/GUID-ACA8C802-9921-4E53-BE52-D5B71145AA17.htm,topicNumber=ROBOTd30e114392

Re: Section builder

Anonymous — Thu, 13 Jun 2013 12:39:41 GMT

I have a doubt if in my Principal System is wraping constant.

Could check my ad?

Re: Section builder

Rafal.Gaweda — Thu, 13 Jun 2013 14:51:24 GMT

This section is defined as a thick walled, not thin walled section.

eThin walled section results Example below

Start Thin walled section, import only centerline of section, then assign \ set correct thickness

Re: Section builder

Anonymous — Thu, 13 Jun 2013 15:17:17 GMT

Thank you very much. This works.

Re: Section builder

Anonymous — Thu, 04 May 2017 06:52:15 GMT

HELP !

How to make a new section (in Section Builder) in order to create variable inertia bars ?

(Impossible since the creation of the bar in Geometry tab)

Re: Section builder

Rafal.Gaweda — Thu, 04 May 2017 06:59:26 GMT

https://forums.autodesk.com/t5/robot-structural-analysis-forum/robot-new-section-for-variable-inertia-bars-help/m-p/7060492#M53110