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Robot Structural Analysis

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Distinguished Contributor
refaat
Posts: 121
Registered: ‎09-17-2012

Re: Only reaction for new model (API)

10-17-2012 04:30 AM in reply to: Rafal.Gaweda

Dear Rafal

 

If I use the elastic supports under RC walls/columns,

e.g. (K=40000 KN/m (constant elastic coef. At support nodes is active) & K=40000 KN/m) respectively. Knowing that the raft slab has (K=40000 KN/m3).

 

My question is

 

Does it give me more accurate results than if I use the fixed supports?

 

Thanks

Refaat

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Product Support
Rafal.Gaweda
Posts: 5,226
Registered: ‎04-26-2010

Re: Only reaction for new model (API)

10-17-2012 04:38 AM in reply to: refaat

Use fixed supports then play with slab as I recommended.



Rafal Gaweda
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Distinguished Contributor
refaat
Posts: 121
Registered: ‎09-17-2012

Re: Only reaction for new model (API)

10-17-2012 07:33 AM in reply to: Rafal.Gaweda

Wonderful , Thank you:smileyhappy:

 

Refaat

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Valued Contributor
RRufino
Posts: 84
Registered: ‎07-22-2011

Re: Only reaction for new model (API)

10-01-2013 04:48 AM in reply to: refaat

Hi Rafal,

 

Any caution is needed when using your API with diagonal bars (as vertical bracing) or with tension bars?

 

Thanks

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Product Support
Rafal.Gaweda
Posts: 5,226
Registered: ‎04-26-2010

Re: Only reaction for new model (API)

10-01-2013 05:44 AM in reply to: RRufino

Reaction macro - does not matter type of bar.
Force macro - does not matter type of bar; Macro takes internal forces from bottom (geometricaly lower Z coordinate nodes) or if bar is horizontal -> forces from endnode of selected bars and adds them as loads (transfered to GCS) to target file.



Rafal Gaweda
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Valued Contributor
RRufino
Posts: 84
Registered: ‎07-22-2011

Re: Only reaction for new model (API)

10-01-2013 06:27 AM in reply to: Rafal.Gaweda

Rafal,

 

Please take a look at this case: http://we.tl/ibjhCT8qtX

 

I've used internal force macro. I'm getting this issues:

 

- on target nodes corresponding from nodes with vertical bracing on source file, some forces aren't ok. Per example: node 8

 

- some nodes, like 2571 have 3 nodal cases but on source file there exist just to bars.

 

Thanks in advance,

 

RRufino

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Product Support
Rafal.Gaweda
Posts: 5,226
Registered: ‎04-26-2010

Re: Only reaction for new model (API)

10-01-2013 02:11 PM in reply to: refaat

I have changed terget filename onto NFC#26.rtd 

min force =1

 

node8.jpg



Rafal Gaweda
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Valued Contributor
RRufino
Posts: 84
Registered: ‎07-22-2011

Re: Only reaction for new model (API)

10-02-2013 01:58 AM in reply to: refaat

Hi Rafal,

 

But isn't  "Minimum force: forces, moments with values lower than indicated (in N) will not be applied to target model"?

 

How putting Minimum force equal to -10000000000000000 (N) is affecting my target file forces? This was just a way to get all forces on target file.

 

And about node 2571?

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Product Support
Rafal.Gaweda
Posts: 5,226
Registered: ‎04-26-2010

Re: Only reaction for new model (API)

10-02-2013 02:07 AM in reply to: RRufino

How putting Minimum force equal to -10000000000000000 (N) is affecting my target file forces? This was just a way to get all forces on target file.

 

It does not matter. Minimal force is kind of tolerance  .....Abs(fx) > MIN_VAL....

 

And about node 2571?


Explain please.



Rafal Gaweda
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Valued Contributor
RRufino
Posts: 84
Registered: ‎07-22-2011

Re: Only reaction for new model (API)

10-02-2013 02:27 AM in reply to: Rafal.Gaweda

"It does not matter. Minimal force is kind of tolerance"

 

So can i put zero?

 

"Explain please."

 

Some nodes, like 2571 have 3 nodal cases on target file but on source file there exist just two bars.

 

P.S.: I forgot to say thank to this two macros you create :smileywink:

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