## Robot Structural Analysis

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# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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.

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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no reply yet!!

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

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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!

help me plz!

thx.

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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 capturethank you.

File please.

**Rafal Gaweda**

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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why you enter the value "!1" along the z axis? ... the value of the automatic load generated is2.5KN, 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**

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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*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!

File please.

**Rafal Gaweda**

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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Hi Rafal, thx for your reply

Rafal.Gaweda wrote:

I calculated the impulsive force and mass induced by the method ofHOUZNERand got the following results:Fi(impulsive force) =-4562 KNandMi(impulsive mass ) =1028t.

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_pratiqu

Thx

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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/filesROBO

T/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-Ana

lysis/useful-addins-for-Robot-API/td-p/3899448

**Rafal Gaweda**

# Re: elevated conical tank:seismic and hydrodynamic loads calculation

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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

**Rafal Gaweda**