tank vertical movement and bund slab joint

[apsix]

I have circular concrete tanks, 7 metres high, sitting on stiff to very stiff alluvial sandy clay, medium to high plasticity.

I'm assuming that there will be some vertical movement as the tanks are filled and emptied.

The tanks are located within a bunded area with a concrete slab floor.

Does anyone have advice/experience regarding the interface of tank base and bund floor.
- Do I provide a control joint with sealant, how will the sealant cope with differential vertical movement? Should there be dowels across the joint?
- Do I keep the tank floor integral with the bund floor?
- Do I need to do FEA to assess effect on bund slab due to tank movement?
- Is a modulus of subgrade reaction of 25 MPa/m (100 pci)reasonable?

Thanks ,John

 

[lexim]

Hi apsix,
To give this a shot;my responses in CAPS
I'm assuming that there will be some vertical movement as the tanks are filled and emptied.
THERE WILL BE MOVEMENT BUT IMMEDIATE WILL BE PRETTY HIGH AND LONG TERM CONSOLIDATION WILL BE VERY INSIGNIFICANT ( so do not worry).

The tanks are located within a bunded area with a concrete slab floor.IS THIS YOUR PREFERENCE AND I WANT TO BELIEVE YOU ARE DESIGNING TO CONTAIN THE LIQUID IN EVENT OF SPILLAGE, TRY READING API 650 FOR OIL AND GAS TANK DESIGNS, YOU DO NOT NEED TO DESIGN A BUND FLOOR.
designing to
Does anyone have advice/experience regarding the interface of tank base and bund floor. THE BUND FLOOR IF PREFFERED WILL NEED TO BE SEPARATED FROM THE TANK FLOOR AND A BAFFLE BOARD COULD BE PROVIDED TO REMOVE ANY BOND.
- Do I provide a control joint with sealant, how will the sealant cope with differential vertical movement? Should there be dowels across the joint?
- Do I keep the tank floor integral with the bund floor?
- Do I need to do FEA to assess effect on bund slab due to tank movement?
- Is a modulus of subgrade reaction of 25 MPa/m (100 pci)reasonable?
AN FE WILL BE APPROPRIATE TO DETERMING THE STRESS DISTRIBUTION AT THE BASE AT DIFFERENT EMPTYING AND FILLING STATE. MODULUS OF SUBGRADE REACTION OF 25MPa WILL BE IDEAL IF THE BUND SLAB IS PROVIDED. (hope this is useful)