Transformer Foundation Design using Reinforced Concrete
Transformer Foundation Design using Reinforced Concrete
(OP)
I am working on a foundation design for a transformer to be used in a substation. I am given a vertical load and told the height of the transformer. This transformer does not have an oil spilled containment, it is just a rectangular slab. I have been given initial dimensions for the transformer foundation slab. I have designed transformers in the past for refineries, but this is my first time doing it for a substation. I believe it should be designed the same way. Is that assumption correct?
When previously designing transformer foundations, the information I first obtained was: the erection & operating weight of the transformer, plan dimension of transformer base, height of transformer, center of gravity location when dealing with seismic, and anchor bolt size & location. The geotechnical information I used was the soil allowable bearing pressure, soil density, and ground water table location.
I computed my lateral shear load and moment caused by wind and/or seismic loads, then checked for the soil bearing pressure, sliding & overturning stability. After determining that the size of my foundation was adequate, I designed the the slab as a regular one-way slab based on the applied forces for strength. Then I designed/checked my anchor bolts.
I was asked about the considering 2/3 dimensions of the slab, dealing with eccentricity, and considering the center of gravity. Some of these other checks seem unfamiliar. The transformer is not in a seismic area, so I am not sure the need for center of gravity (I can assume the center of gravity based on the foot print of the transformer since I don't have vendor drawings).
Please let my know if you see something I am missing/overlooking. Any suggestions/comments are appreciated.
When previously designing transformer foundations, the information I first obtained was: the erection & operating weight of the transformer, plan dimension of transformer base, height of transformer, center of gravity location when dealing with seismic, and anchor bolt size & location. The geotechnical information I used was the soil allowable bearing pressure, soil density, and ground water table location.
I computed my lateral shear load and moment caused by wind and/or seismic loads, then checked for the soil bearing pressure, sliding & overturning stability. After determining that the size of my foundation was adequate, I designed the the slab as a regular one-way slab based on the applied forces for strength. Then I designed/checked my anchor bolts.
I was asked about the considering 2/3 dimensions of the slab, dealing with eccentricity, and considering the center of gravity. Some of these other checks seem unfamiliar. The transformer is not in a seismic area, so I am not sure the need for center of gravity (I can assume the center of gravity based on the foot print of the transformer since I don't have vendor drawings).
Please let my know if you see something I am missing/overlooking. Any suggestions/comments are appreciated.






RE: Transformer Foundation Design using Reinforced Concrete
or Category IV, "Buildings and other structures required to maintain the functionality of other Risk Category IV structures."
This may (or may not) be different than transformers at refineries.
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RE: Transformer Foundation Design using Reinforced Concrete
RE: Transformer Foundation Design using Reinforced Concrete
RE: Transformer Foundation Design using Reinforced Concrete
In an existing yard, the walls are usually in place for the replacement transformer, and the foundations left in place. Gravel dug out and silt removed too.