Dynamic load factor for liquid induced loads

[AceengSha]

Hi all,

I am designing an RC frame 7m high which holds a water tank at 7m level. The tank has two supports and sits on two horizontal beams.

The loads I in consideration are as follows:

Dead tank self weight: 100kN
Imposed: 200kN (Water vertical)
Dynamic load: 100kN (water vertical)
Dynamic load: 50kN Fx (water longitudinal)
Dynamic load: 50kN Fy and 100kNm Fy (water transversal)

The recommended value of the partial factor for the liquid induced loads during operation
YQ= 1,20. (BS EN 1991-4: Silos and tanks)

Can I apply a factor of 1.20 to all the above imposed loads for the frame design loads?

is there a separate factor for the dynamic loads? or can I treat them as imposed loads to the frame?

Thank you

 

[WARose]

I would think it would depend on how you arrived at those loads. I.e. are they seismic? Imposed by piping or another source?

If they are seismic loads (calculated by a recognized code like ASCE, API, etc)......there would be no need for a DLF (Dynamic Load Factor). However if these are conventional loads figured by calculations that did not take into account the dynamics of the system.....then I would definitely impose a DLF (the maximum of which would be 2).

 

[AceengSha]

They are not seismic loads...they are loads from a dearator tank. When the water comes in to the tank it creates like a dynamic effect.

 

[WARose]

Then I'd definitely use a DLF.