Steel Column Isolation Detail

[bldgdesign]

I have come across a Typical Column Base Detail for a steel column that shows the top of footing at 16" below finished floor. The slab is 4" thick and the diamond around the column is shown as 4" thick. I have always seen the diamond extend from finished floor down to top of footing and encase the column, base plate, and anchor rods. I assumed the column, base plate, and anchor rods should be encased in concrete below grade to resist corrosion. This detail shows the anchor rods, base plate, and lower 12" of column exposed to earth.

What are your thoughts? Is this acceptable practice? Is it common?

 

[hokie66]

There are other ways to protect the column below the slab. Bituminous coatings work.

 

[bldgdesign]

Does it need to be protecte below the slab? How are most people detialing the column isolation? full depth or thickness of the slab?

 

[lkjh345]

I generally show the column column isolation block full depth to the top of the footing.

I think it would be very poor practice not to protect a steel column below a floor slab.