> From: Panos Trochalakis <panost(--nospam--at)ckcps.com>
> Could either a steel fabricator or someone from AISC respond regarding
> economical base plate thicknesses? At what point does it become more
> economical to start using stiff. plates or other stiffening elements to
> reduce the base plate thickness. An example is using stiff. plates or small
> channels at moment frame or braced frame columns with large uplift loads.
> There would be a savings in material. However, there is added shop welding
> of the stiffening elements.
It takes a lot of steel to balance the labour cost for even small
amounts of welding and material handling to make stiffeners.
However, above about 1 1/2" thick base plates you will have difficulty
getting holes punched. Then the cost of reaming holes probably matches
labour for welding a couple simple stiffeners.
After that, base plate thickness probably isn't a major factor in more
complex base arrangements.
Paul Ransom, P. Eng.
Burlington, Ontario, Canada