## Robot Structural Analysis

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

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1-Why u've chosen 3 rows of noeds? why not 4 or 5...or simply 1 ?

for simplicity, as an example

and how can I know the exact level for applying masses?

You should know how you calcaulated masses, from which range.

2- If I chosen to add masses in modal case, should I select more rows too or apply them simply in 1 row ?

See above

3- I've enter the values such as you indicated in "masse_eau" case then convert them to masses, but when I launched calculation, this error message appears

so I've applyed them in modal case, and I obtained the results below,which seem to me wrong, especially the sum of the masses in the modal analysis and the moment along the Y axis and the shear along the X axis incombination case "G+Q+E"

File please.

**Rafal Gaweda**

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

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Hi Rafal,

Rafal.Gaweda wrote:

1-Why u've chosen 3 rows of noeds? why not 4 or 5...or simply 1 ?

for simplicity, as an example

and how can I know the exact level for applying masses?

You should know how you calcaulated masses, from which range.

2- If I chosen to add masses in modal case, should I select more rows too or apply them simply in 1 row ?

See above

3- I've enter the values such as you indicated in "masse_eau" case then convert them to masses, but when I launched calculation, this error message appears

so I've applyed them in modal case, and I obtained the results below,which seem to me wrong, especially the sum of the masses in the modal analysis and the moment along the Y axis and the shear along the X axis incombination case "G+Q+E"

File please.

My file is attached to my post N°17 in page 2 (elevated_tank_1000)

Thx.

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

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My results for model from post 17

**Rafal Gaweda**

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

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Hi Rafal,

I forgot to enter the mass in the old file you calculate, so pls check this new file where I get error 5000,

question:

should I check disregrad density in modal option?

comment my results pls!

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

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**Rafal Gaweda**

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

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correct loads:

**Rafal Gaweda**