P-delta results

P-delta results

EY23
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Message 1 of 10

P-delta results

EY23
Enthusiast
Enthusiast

IF I run P-delta analysis to all the loads on my structure, why in the provided reinforcement module these loads are not shown? if that is true how can I intergrate the results of P-Delta analysis in the provided Reinforcement module Smiley Frustrated

 

 

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9 Replies
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Message 2 of 10

Rafacascudo
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Because your combination has also to be a P-delta analysis.

You can not combine P-delta isolated load cases . It will not work

Rafael Medeiros
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Message 3 of 10

EY23
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.

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Message 4 of 10

EY23
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Thank you for your replySmiley Happy

1)I tried all the load With a new manual combination created to be calculated as p-delta but I got the same issue.(no loads shown in the simple cases)

 

2)but if make the simple cases static linear and the load combination as p-delta, I'll get all the loads in the simple cases tab, but do robot in this case use any result (especially defection) from the p-delta combination.

 

what I mean, in ACI-318 we can use p-delta analysis and ignore the factors of moment of inertia for each member. Case (2) above can lead of the same results?

 

what about the new option in robot 2015 the DAM analysis? can i use it for concrete structure? Will it have any effects on base shear when designing the footing (if seismic load is added)

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Message 5 of 10

EY23
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How can i check if Robot considered the P-delta analysis results in the rc design module?

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Message 6 of 10

Artur.Kosakowski
Autodesk Support
Autodesk Support

@EY23 wrote:

How can i check if Robot considered the P-delta analysis results in the rc design module?


The design is based on the values of internal forces calculated for a model. If they are obtained for P-Delta analysis then RC design module uses them too.

 

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Artur Kosakowski
Message 7 of 10

EY23
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So If i run the DAM model robot will automatically take the results to RC provided reinforcement module? 

 

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Message 8 of 10

Artur.Kosakowski
Autodesk Support
Autodesk Support

If you run second order analysis (plus reduction of stiffness added manually as attributes of elements of a model) as DAM model is supported in the steel design module only.

 

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Artur Kosakowski
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Message 9 of 10

EY23
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So as a conclusion...I cannot run p-delta analysis if i want to use rc prov. Reinf. Module ...i can only use second order analysis with reduction of stifness manually ( so that all the forces will show up)
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Message 10 of 10

Artur.Kosakowski
Autodesk Support
Autodesk Support
Accepted solution

By second order analysis I meant P-Delta. As I wrote you can set this kind of analysis to combinations created in the model, calculate the model and use the results of these combinations in the RC design modules.

 

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.



Artur Kosakowski
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