Hole in Center of Baseplate for Circular or Rectangular Columns
Hole in Center of Baseplate for Circular or Rectangular Columns
(OP)
Before getting into some sort of complicated stress analysis, does anyone know if there are guidelines for holes in the center of a baseplate for circular or rectangular HSS columns?
When thinking about this the center does not seem all that important as the design is normally based on an effective cantilever distance to the bolts. However if you were to say remove then entire center of the baseplate then the moment from that cantilever distance is applied to the face of the column. I suppose though that you could add radial stiffener plates that would help distribute this moment.
Anyone done something like this before? In this case the hole is for plumbing/conduit so I imagine this has been done before. For reference, the column is 24" diameter with a substantial moment at the base on the order of 100 kip-ft.
Thanks!
When thinking about this the center does not seem all that important as the design is normally based on an effective cantilever distance to the bolts. However if you were to say remove then entire center of the baseplate then the moment from that cantilever distance is applied to the face of the column. I suppose though that you could add radial stiffener plates that would help distribute this moment.
Anyone done something like this before? In this case the hole is for plumbing/conduit so I imagine this has been done before. For reference, the column is 24" diameter with a substantial moment at the base on the order of 100 kip-ft.
Thanks!






RE: Hole in Center of Baseplate for Circular or Rectangular Columns
If so, what is the diameter and wall thickness and material spec of the baseplate?
What is the proposed bolt circle dia of the baseplate? (or only 4x bolts at what spacing?)
What thickness baseplate?
What is the proposed diameter of the hole for the electrical conduit?
How do you propose attaching the baseplate to the vertical member? Any radial braces?
Will you have a access plate to connect up and route the electrical conduits?
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
BA
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
The big polygonal utility poles have commonly have holes of varying sizes in the base plate- in some cases, just making them a circular ring.
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
Yes, 3/4" thick
Base plate is currently 36x36 w/ 10 bolts but I like the idea of a circular baseplate and circular bolt pattern (I can change to that). ASTM A36 material
Currenlty 7" diameter
Fillet weld around the outside of the column. I can add radial braces at the base plate if necessary.
Yes, probably.
Thanks again!
EIT
www.HowToEngineer.com
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
http://www.towernx.com/downloads/Technical_Manual_...
BA
RE: Hole in Center of Baseplate for Circular or Rectangular Columns
ASCE 113 also has the older ASCE 48-2005 method and is currently being revised.
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RE: Hole in Center of Baseplate for Circular or Rectangular Columns
Thanks for the other suggestions as well.
EIT
www.HowToEngineer.com
RE: Hole in Center of Baseplate for Circular or Rectangular Columns