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Re: Base Plate design

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Do a free-body diagram and distribute the loads to each anchor bolt.   Depending on the shape of your column and your selection of where the anchor bolts are going to be located, you can probably estimate or model the amount of bending and shear there is in the plate.   It appears that all the concrete will be doing is resisting the uplift of the bolts so you should be looking at your embedment lengths and cone grouping.  I don't remember this being in Blodgett or in the AISC phamphlets


Neil Moore, SE, SECB



At 06:49 AM 2/28/2008, you wrote:
I have the Blodgett book and the AISC Design guide.  Both references do not discuss a column base subjected to Moment with uplift forces.  (When i say uplift, i mean that the axial force on the column is tension, or Pu = -60 K)

For instance, if my uplift is large in combination with a smaller moment, there may not be any compression force on the baseplate.  All bolts will be in tension, but one side of the anchor rods will be in higher tension loads than the other due to the moment.

Now, what if you have a large uplift, and a large moment, where you have a little compression on the baseplate, etc. 

With these conditions, i don't think that the the _expression_ for 'Y' (the length of plate in compression) is applicable.

I hope you can understand my question.  if you need an example, how would you design a baseplate for Pu= -60K with Mu = 130 k-ft?

Thanks for your responses...


Andy Heigley, PE



Micayas, Julius wrote:
Andy,
 
I got one good reference for you from AISC titled: Steel Design Guide Series 1
 
Column Base Plate
By: John T. DeWolf
 
Some Practical Aspects of Column Base Selection
David T. Ricker
 
This is a publication combined issue by the AISC and the Berlin Steel Company, Inc.
 
Engr. Julius Micayas
P.E. license no.32969
Project Manager/Sr Lead Structural engineer
River Consulting LLC
111 Veterans Memorial Boulevard
               Suite 1600
Metairie, Louisiana 70005
Phone - 504-841-3014 (direct)
504 837-5275 (office)
Fax - 504-837-2986
E-mail: jmicayas(--nospam--at)riverconsulting.com
W-page:            www.riverconsulting.com

From:
Gary Loomis [ mailto:gloomis(--nospam--at)MasterEngineersinc.com]
Sent: Thursday, February 28, 2008 7:46 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Base Plate design
 
Yes, Blodgett ?Design of Welded Structures?  is probably one of the best.  And it is relatively cheap $10.00.
 
Gary W. Loomis, P.E., Senior Structural Engineering
Master Engineers and Designers, Inc.
-----Original Message-----
From: Andy Heigley [mailto:aheigley(--nospam--at)jgaeng.com]
Sent: Thursday, February 28, 2008 8:30 AM
To: SEAINT
Subject: Base Plate design
 
Hello all:

I'm looking for any references for designing column base plates where the column base is subjected to uplift and a large moment.

The AISC design guide does not discuss a column base with moment in combination with uplift.

Does anybody have any references for such a design?

Thanks in advance,



--

Andry Heigley,
PE

 

 
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