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Re: STEEL: Min. Required Thickness for Anchor Rod Plate Washers

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Here's a SWAG...........1/2 the bolt diiameter but never thinner than 5/16?  

seems about right

cheers
Bob

On 6/8/05, Adair, Joel <jadair(--nospam--at)halff.com> wrote:
>  
> AISC Steel Design Guide 1, "Column Base Plates", indicates that the plate
> washers should be 5/16" to 1/2" thick.  It doesn't, however, provide any
> guidance as to determining the appropriate thickness within that range for a
> specific situation.  I've stewed about this on occasion, but haven't had a
> situation yet where my forces being transmitted were such that I was
> motivated to make a research project out of it.  I typically use 5/16" or
> 3/8" plate washers. 
>   
> -- Joel 
>   
>  
> --------------------------------- 
> Joel Adair, P.E. 
> Halff Associates, Inc. 
> Dallas, Texas 
> ---------------------------------
>  
>  
>  
> -----Original Message-----
> From: Polhemus, Bill [mailto:bill.polhemus(--nospam--at)tyson.com] 
> Sent: Wednesday, June 08, 2005 4:20 PM
> To: seaint(--nospam--at)seaint.org
> Subject: STEEL: Min. Required Thickness for Anchor Rod Plate Washers
> 
>  
> 
> I'm looking to include some info in a structural steel specification for
> these plate washers. I'd never really thought much about it before, but this
> could actually be a critical item of performance. 
> 
> The Manual of Steel Construction, 3rd Edition, page 14-10 states "[Plate
> washer] thickness must be suitable for the forces to be transferred." Table
> 14-2 is cited but concerns itself only with the minimum plate size to cover
> the anchor bolt hole. 
> 
> Does anyone have a "rule of thumb" for plate washer thickness for base plate
> anchor rods, ideally as a function of the anchor bolt diameter? 
> 
> I realize I could probably spend a few hours coming up with my own (e.g.
> plate on knife-edge supports with central hole, which IIRC is in "Roark")
> but I haven't the time right now. 
> 
> Any insights would be much appreciated. 
> 
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