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.
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
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.
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.
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
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.
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
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.
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.
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.
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.
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
@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
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
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