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REDO10
Posts: 38
Registered: ‎10-22-2011

elevated conical tank:seismic and hydrodynamic loads calculation

579 Views, 35 Replies
12-05-2013 10:13 AM

Hi,
I'm looking for an exemple of modeling seismic and hydrodynamic loads for an elevated conical tank!
I tried modeling it, but when I define masses, the following message appears " load by hydrostatic pressure can not be converted into masses. delete the hydrostatic pressure of the case converted"

I can't attach my file bellow, because it's too large (114 Mo).

thanks.

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Rafal.Gaweda
Posts: 5,176
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-05-2013 10:24 AM in reply to: REDO10
"Note For shell structures a hydrostatic pressure load cannot be converted to masses."
http://docs.autodesk.com/RSAPRO/2014/ENU/index.html?url=filesROBOT/GUID-FEC73829-9EDF-406B-9BAB-4A92...


Rafal Gaweda
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Active Contributor
REDO10
Posts: 38
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-05-2013 11:05 AM in reply to: Rafal.Gaweda
thanks Rafal for your reply
so how can I define the masses due to liquid?
should I set a master node and assign to it mass of liquid? or how?
if you have an example of modeling it's better
thanks
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Rafal.Gaweda
Posts: 5,176
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-05-2013 11:29 AM in reply to: REDO10
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Active Contributor
REDO10
Posts: 38
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-06-2013 02:34 AM in reply to: REDO10

Hi,

I attach my file below
Can you help me add water masses?
and how I can get the resulting seismic forces at the base for calculation of foundations?

Thanks

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Active Contributor
REDO10
Posts: 38
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-07-2013 02:32 PM in reply to: REDO10

No reply!!!! :smileyindifferent:

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Rafal.Gaweda
Posts: 5,176
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-09-2013 04:15 AM in reply to: REDO10


Can you help me add water masses?

 

Look at post 4 above or calculate nodal masses by your own and apply to nodes.


and how I can get the resulting seismic forces at the base for calculation of foundations?

 

I think, firts you have to create combinations  or generate automatic combinations then look at reactions for them.

 



Rafal Gaweda
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Active Contributor
REDO10
Posts: 38
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-09-2013 05:23 AM in reply to: Rafal.Gaweda

thanks Rafal for your reply
1 - Have you seen my model? no comment to do?
2 - for assign masses,  I looked at the post4 but I did not understand the procedure to do so.
can you make a demonstration for me or introduce the masses in my model?
3 -
for the calculation of foundations, should I select the reduced forces for the combination in question?

Thanks.

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Rafal.Gaweda
Posts: 5,176
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-10-2013 01:07 AM in reply to: REDO10

1 - Have you seen my model? no comment to do?

 

No combinations, 


2 - for assign masses,  I looked at the post4 but I did not understand the procedure to do so.
can you make a demonstration for me or introduce the masses in my model?

 

Example for one (half) strip : http://screencast.com/t/vHD6OhqLWkAd

of course set proper value ; then this load can be converted onto masses.


3 -
for the calculation of foundations, should I select the reduced forces for the combination in question?

 

Maybe sum of reactions instead



Rafal Gaweda
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Valued Mentor
t.sautier
Posts: 416
Registered: ‎12-14-2012

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-12-2013 08:26 AM in reply to: REDO10
Once again, "attaching" the water to the building is wrong I think.
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