Base plate tension distribution to anchor bolts
Base plate tension distribution to anchor bolts
(OP)
I have a steel plate which is held down by 8 anchor bolts (labeled A-G, see the attached drawing,). The plate is loaded by an upward (out of plane) force which is eccentric to the center of the plate. Can anyone suggest a reference or method to determine the tension that each bolt will resist? I feel like it should be proportional to the distance of each bolt from the point of load application, but can't figure out how to turn that concept into an actual equation. Thanks for any help you can provide.






RE: Base plate tension distribution to anchor bolts
RE: Base plate tension distribution to anchor bolts
Then, look at the moment created by the eccentricity in one direction. This will create tension in 3 bolts, compression in 3 bolts, and no effect in 2 bolts.
Add these results to the uniform tension calculated in step 1, then, repeat for the eccentricity in the opposite direction.
RE: Base plate tension distribution to anchor bolts
RE: Base plate tension distribution to anchor bolts
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RE: Base plate tension distribution to anchor bolts
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RE: Base plate tension distribution to anchor bolts
Annex D has the equations to work all this out. There is an "eccentricity" factor that accounts for the fact the tension is not at the centroid.
Also, from above how does a base plate put a bolt into compression?? Unless there is a levelling nut either side this is not the case, the tension goes into the bolts and the compression goes from the base plate to the concrete in bearing, the location of this reaction point is dependant on the stiffness of the base plate.