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Active Contributor
REDO10
Posts: 37
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-26-2013 06:07 AM in reply to: REDO10

Hi Rafal,

I saw the demo that you did, but I have some questions:
1 -Should I define a new load case to assign water masses (it can be dead or live)?
2 -Should I define a mass coeficient for the new load case in calcul option?
I apply the changes I have indicated above, but I got an error message, see the attached capture
thank you.

Please use plain text.
Active Contributor
REDO10
Posts: 37
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

12-31-2013 04:20 AM in reply to: REDO10

no reply yet!! :smileysad:

why you enter the value "1" along the z axis? ... the value of the automatic load generated is 2.5 KN, but in reality it is variable according to a hyperbolic function!
how to get the theoretical reinforcement of the tank? ..when I run the calculation of reinforcement the following error appears : "the element is not calculated, the direction of reinforcement is incorrect" and Should I select the option analytical or wood & Amer?

thanks

Please use plain text.
Active Contributor
REDO10
Posts: 37
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-01-2014 09:58 AM in reply to: REDO10

Hi,

I calculated the impulsive force and mass induced by the method of HOUZNER and got the following results:                 Fi (impulsive force) = -4562 KN  and  Mi (impulsive mass ) = 1028 t.

how can I enter these values?

NB: I followed Rafal's demo  and I noticed that the period of oscillation does not change compared to the  statitique case, it means that the mass of water is not taken into consideration! :smileyfrustrated:

help me plz!

thx.

Please use plain text.
Product Support
Rafal.Gaweda
Posts: 4,930
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-02-2014 12:24 AM in reply to: REDO10


1 -Should I define a new load case to assign water masses (it can be dead or live)?

 

As you like.


2 -Should I define a mass coeficient for the new load case in calcul option?

 

If you want to convert loads to masses - yes


I apply the changes I have indicated above, but I got an error message, see the attached capture
thank you.

 

File please.



Rafal Gaweda
Please use plain text.
Product Support
Rafal.Gaweda
Posts: 4,930
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-02-2014 12:27 AM in reply to: REDO10

why you enter the value "1" along the z axis? ... the value of the automatic load generated is 2.5 KN, but in reality it is variable according to a hyperbolic function!

 

As I mentioned thsi was just example of one strip. Set correct value.


how to get the theoretical reinforcement of the tank? ..when I run the calculation of reinforcement the following error appears : "the element is not calculated, the direction of reinforcement is incorrect" and Should I select the option analytical or wood & Amer?

thanks

 

Set Automatic direction or along Z.



Rafal Gaweda
Please use plain text.
Product Support
Rafal.Gaweda
Posts: 4,930
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-02-2014 12:28 AM in reply to: REDO10

 

I calculated the impulsive force and mass induced by the method of HOUZNER and got the following results:                 Fi (impulsive force) = -4562 KN  and  Mi (impulsive mass ) = 1028 t.

how can I enter these values?

 

What is that?

 

NB: I followed Rafal's demo  and I noticed that the period of oscillation does not change compared to the  statitique case, it means that the mass of water is not taken into consideration! :smileyfrustrated:

 

 

File please.



Rafal Gaweda
Please use plain text.
Active Contributor
REDO10
Posts: 37
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-02-2014 06:45 AM in reply to: Rafal.Gaweda
Hi Rafal, thx for your reply

Rafal.Gaweda wrote:

 

I calculated the impulsive force and mass induced by the method of HOUZNER and got the following results:                 Fi (impulsive force) = -4562 KN  and  Mi (impulsive mass ) = 1028 t.

how can I enter these values?

 

What is that?


1- I used Houzner's method to calculate hydrodynamic forces generated when seisme happen and I obtained the results above, I want now assign the mass calculated (Mi=1028t) to my model, so pls do that for me (I attached my file below)

 

2- How to obtain reduces forces at base to calculate foundation (no values in the table),show capture below

and is there an addin for transferring reactions to actions and introduce them in a new model to calculate foundation?

 

If you want, I attached a link for Houzner's methode, it is on french

http://www.4shared.com/get/0mZzq6jJ/calcul_pratique_rservoir_au_si.html?sop=true

Thx

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Active Contributor
REDO10
Posts: 37
Registered: ‎10-22-2011

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-03-2014 02:49 AM in reply to: Rafal.Gaweda



Rafal.Gaweda wrote:

How to get the theoretical reinforcement of the tank? ..when I run the calculation of reinforcement the following error appears : "the element is not calculated, the direction of reinforcement is incorrect" and Should I select the option analytical or wood & Amer?

thanks

 

Set Automatic direction or along Z.


I set Automatic direction then along Z but I still get the same error message!!??

my file is attached above

Please use plain text.
Product Support
Rafal.Gaweda
Posts: 4,930
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-03-2014 03:31 AM in reply to: REDO10

 

2- How to obtain reduces forces at base to calculate foundation (no values in the table),show capture below

 

Reduced forces should be calculated only for two-dimensional panels with the shape of a convex quadrilateral. They will not be calculated for the following types of panels.

  • Panels created by means of Extrude and Revolve editing.
  • Three-dimensional panels (curved).
  • Panels that are not quadrilaterals.
  • Concave quadrilateral panels (not convex).
  • Panels with variable thickness.

http://docs.autodesk.com/RSAPRO/2014/ENU/filesROBOT/GUID-003921A4-A845-4E06-808F-BC0CFF8A2FDE.htm

 

Use reactions or sum of reactions

 

and is there an addin for transferring reactions to actions and introduce them in a new model to calculate foundation?

 

@Import of reactions to new model@ in http://forums.autodesk.com/t5/Robot-Structural-Analysis/useful-addins-for-Robot-API/td-p/3899448

 

 

 

 

 



Rafal Gaweda
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Product Support
Rafal.Gaweda
Posts: 4,930
Registered: ‎04-26-2010

Re: elevated conical tank:seismic and hydrodynamic loads calculation

01-03-2014 03:39 AM in reply to: REDO10

How to get the theoretical reinforcement of the tank? ..when I run the calculation of reinforcement the following error appears : "the element is not calculated, the direction of reinforcement is incorrect" and Should I select the option analytical or wood & Amer?

thanks

 

Set Automatic direction or along Z.


I set Automatic direction then along Z but I still get the same error message!!??

my file is attached above


This part of model (see below) must be made as a separate panel because angle between Z global axis and its plane is 90deg

 

deckwatertank.jpg



Rafal Gaweda
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