"Welded steel structures" by Blodgett has a section on
designing base plates subjected to moment and axial
load. Use the formulas to check if the base
plate/anchor bolt detail can sustain the applied
column loads. Check the adequacy of the anchor bolt
embedment in concrete to transfer the column loads
into the foundation. And, check if the weld at
column/base plate is adequate for applied column
loads. If all of these modes check okay, then the
detail can be treated as fixed.
A four bolt base plate is more likely going to provide
a fixed condition. A two bolt connection, on opposite
sides of the web will be a pinned connection.
--- Nacionales Alex <acnacionales(--nospam--at)yahoo.com> wrote:
> I am checking a structural computation for a four
> storey steel framed building. The framing in the
> calculation shows fixed supports but the detail in
> plan shows the supports are steel baseplates with 4
> 25mm-anchor bolts. The columns are directly welded
> the baseplates. It is my opinion that this kind of
> connection is a pinned type connection and should be
> treated as such in the calcs.
> Thank you for your comments.
> Alex C. Nacionales, C.E.
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