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stroxy
Posts: 190
Registered: ‎12-06-2011

column-basement wall interface singularity issues

286 Views, 12 Replies
09-07-2012 12:57 AM

I notice that when modelling a column chain extending into a RC basement wall that there is a singularity problem (high internal forces) in the panel at the boundary of the column and basement wall element at top of basement level and also (from a previous enquiry) that RSA does not recognize columns embedded in walls.  My question is what would be the proper way to model such a scenario?

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Product Support
pp2008
Posts: 528
Registered: ‎06-23-2008

Re: column-basement wall interface singularity issues

09-07-2012 01:20 AM in reply to: stroxy

Do you mean the situation like shown below or something else?

column&wall.png

It would be the best to send the model.

 

Regards,



Pawel Pulak
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Mentor
stroxy
Posts: 190
Registered: ‎12-06-2011

Re: column-basement wall interface singularity issues

09-07-2012 01:41 AM in reply to: pp2008

Exactly!!  When modelled as you have shown in a seismic situation, abnormally high internal forces are recorded at the column wall interface in the panel

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Product Support
pp2008
Posts: 528
Registered: ‎06-23-2008

Re: column-basement wall interface singularity issues

09-07-2012 01:53 AM in reply to: stroxy

Can you send the model?

Reducing size by saving without results with a new name and then compressing to ZIP.

 

Regards,



Pawel Pulak
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Mentor
stroxy
Posts: 190
Registered: ‎12-06-2011

Re: column-basement wall interface singularity issues

09-07-2012 02:15 AM in reply to: pp2008
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pp2008
Posts: 528
Registered: ‎06-23-2008

Re: column-basement wall interface singularity issues

09-07-2012 03:45 AM in reply to: stroxy

Thank you for the file but when trying to calculate it (both "out of the box" and after freezing all FE meshes) verification reports incoherent mesh error and analysis cannot be run.

It seems that the model is different than the model you calculated and observed anomalies of results.

 

The name of file suggests that it was opened in repair mode. This operation results in restoring default job preferences, so if job preferences of your calculated model were different than default ones then the model you sent me can have different job preferences than the original ones - for instance in relation to using kinematic constarints or iterative adjustment of FE meshes, ignoring verification errors, etc.

 

Ffor your calculated model with results can you use "Save as" with different file name and selecting as file type "ROBOT - without results (*.rtd)". Then please compress to ZIP. It will guarantee that when calculating this model I will receive the same behavior and results as yours.

 

Can you also mention in which location have you observed abnormal values of forces and for which components of internal forces was it observed?

 

Thank you, 



Pawel Pulak
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Mentor
stroxy
Posts: 190
Registered: ‎12-06-2011

Re: column-basement wall interface singularity issues

09-07-2012 03:50 AM in reply to: pp2008

Yes I observed the mesh inconsistency error with the file I sent you and corrected it.  I will resend shortly

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Mentor
stroxy
Posts: 190
Registered: ‎12-06-2011

Re: column-basement wall interface singularity issues

09-07-2012 03:59 AM in reply to: pp2008

compressed ( zip) file size is 1600 kb.  Any other way I can send you the file?

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Product Support
pp2008
Posts: 528
Registered: ‎06-23-2008

Re: column-basement wall interface singularity issues

09-07-2012 04:03 AM in reply to: stroxy

Hi,

I will send you private message with transfer info.

 

Regards,



Pawel Pulak
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Mentor
stroxy
Posts: 190
Registered: ‎12-06-2011

Re: column-basement wall interface singularity issues

09-07-2012 04:04 AM in reply to: pp2008

Thanks

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