topic Re: Local reactions (API) in Robot Structural Analysis Forum

Local reactions (API)

Simau — Thu, 28 Feb 2013 16:32:22 GMT

Hello All,

I have a three-dimensional structure over a concrete structure. I wonder if there is a possibility to recover reactions of the frame on concrete.

Attached a partial view

Re: Local reactions

Artur.Kosakowski — Wed, 27 Feb 2013 16:05:14 GMT

What about checking the forces in steel bars in the nodes that are 'connected' with the concrete frame?

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

Re: Local reactions

Simau — Wed, 27 Feb 2013 20:53:37 GMT

For one node and one steel bar, there is no problem. But with 3 or more bars per concrete support and many load cases its not paratical.

Is there any possibility to have the results directly like (Fx, Fy, Fz, Mx, ...) on each bearing points in order to size the anchorge, or the only solution is what you suggest.

Thanks

Re: Local reactions

Rafal.Gaweda — Thu, 28 Feb 2013 08:48:03 GMT

I have different macros for different purposes

1. http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Envelope-of-forces-at-a-connection-API/m-p/3701996/highlight/true#M8928 - forces in LCS of bars

2. I have also similar macro but presenting forces in GCS

3. and macro listing internal forces from bottom node of selected bars as reactions

4. or .. what do you want ?

Re: Local reactions

Artur.Kosakowski — Thu, 28 Feb 2013 09:14:32 GMT

For one node and one steel bar, there is no problem. But with 3 or more bars per concrete support and many load cases its not paratical.

You can define connect the inclined bars e.g. 1cm above the bottom node of the vertical one. This allow you to have only one set of forces to check (from the vertical bar).

Is there any possibility to have the results directly like (Fx, Fy, Fz, Mx, ...) on each bearing points in order to size the anchorge, or the only solution is what you suggest.

Rafal's macros (or Excel).

Re: Local reactions

Simau — Thu, 28 Feb 2013 12:52:49 GMT

I try the macro in the link, very useful but not for my need.

Can i try proposal number 3.

Thanks Rafal

Re: Local reactions

Simau — Thu, 28 Feb 2013 12:59:49 GMT

Ok Artur, if I was the author of the model I have done so.

But i am just trying to extract these réaction in an easy way.

Therefore is it possible to easily split the structure, by adding a small barre (1cm) between stell and concrete.

Re: Local reactions

Simau — Thu, 28 Feb 2013 13:02:09 GMT

Therefore is it possible to easily split the structure, by adding a small barre (1cm) or a rigid link between stell and concrete.

Re: Local reactions

Artur.Kosakowski — Thu, 28 Feb 2013 13:22:57 GMT

1. Select the top part and copy it vertically e.g. 20 m upwards

2. Delete the 'original' top part

3. Move the copied part 20m - 1cm downwards

4. Define rigid links or small bars.

Re: Local reactions (API)

Rafal.Gaweda — Thu, 28 Feb 2013 14:40:26 GMT

@Simau wrote:

I try the macro in the link, very useful but not for my need.

Can i try proposal number 3.

Example macro attached.

Select calculated file, enter bars selection in Excel cell then Run

(if you want forces as internal forces in GCS just got to VB editor and remove -1 multiplier from similar lines like that ....... = -1 * vals(0))

Re: Local reactions (API)

Rafal.Gaweda — Thu, 28 Feb 2013 14:41:21 GMT

If you like it I can change it to work on opened file and bar selection made in robot.

Re: Local reactions

Simau — Thu, 28 Feb 2013 19:26:30 GMT

Thanks Artur,

it works fine

Re: Local reactions (API)

Simau — Thu, 28 Feb 2013 19:37:00 GMT

Thanks Rafal,

Your excel file meets my needs.

As i need only reaction, It would be great to have the sum of the effort instead of the effort in each bar.

"If you like it I can change it to work on opened file and bar selection made in robot."

Sorry but i don't understand what you mean

Re: Local reactions (API)

Simau — Fri, 01 Mar 2013 16:26:32 GMT

Yes, if its possible, i would like to have it works in opened file.

Thanks for help

Re: Local reactions (API)

Rafal.Gaweda — Tue, 05 Mar 2013 13:20:18 GMT

Simau wrote:

Yes, if its possible, i would like to have it works in opened file.

Two files - one is listing them as Forces , second as reactions (diference = force sign)

Forces sum as a result implemented 🙂

(forces listed from lower node of bar, if both nodes have the same Z coord then forces listed from bar endnode)

Re: Local reactions (API)

Simau — Mon, 04 Mar 2013 10:15:23 GMT

Thanks Rafal,

this apps are just great

Re: Local reactions (API)

micp_rsa — Tue, 28 May 2013 08:37:20 GMT

Hi Rafal!

Apps are working ok, but is there any possibility to extract forces from combinatios. I assume for automatic combinations it will be harder but what about manual combination list?

In my case apps display only forces for simple cases.

regards

michal

Re: Local reactions (API)

Rafal.Gaweda — Tue, 28 May 2013 10:02:47 GMT

Panie MIchale,

Of course it can be updated.

Basing on examples attached to thread listed below you can update this macro to get results for combinations and automatic combinations also :

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Export-results-ARSA-via-API/td-p/3294083/page/2

This small update is required to get also results for manual combinations:

.......    
    Dim case_sel As IRobotSelection
    Set case_sel = R.Project.Structure.Selections.CreatePredefined(I_PS_CASE_SIMPLE_CASES)
    
    Dim mancomb_sel As IRobotSelection
    Set mancomb_sel = R.Project.Structure.Selections.CreatePredefined(I_PS_CASE_COMBINATIONS)
    
    case_sel.Add mancomb_sel
    
    Log "Getting forces ..."
........

Updated macro attached.

Shall I give you some time to update it with automatic combinations?

Re: Local reactions (API)

micp_rsa — Tue, 28 May 2013 09:32:16 GMT

Panie Rafale,

thansk for your interest. Unfortunately attached macro crashes while I click "Run" button (Excel has stopped working).

btw. Shall you give me some time... 🙂 It's a first time I have contact with API and it may take some time for me to familiarize with it. In my spare time I deinetally will put a spootlihgt on it.

Thanks

Re: Local reactions (API)

Rafal.Gaweda — Tue, 28 May 2013 10:01:46 GMT

thansk for your interest. Unfortunately attached macro crashes while I click "Run" button (Excel has stopped working).

Screen shot with the crash please (code line where it stopped)

Maybe :

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Robot-API-for-ARSA-2012-error-429/m-p/3215324/highlight/true#M1217

http://forums.autodesk.com/t5/Autodesk-Robot-Structural/API-error/m-p/3518984/highlight/true#M5791