Base Plate Prying Action?
Base Plate Prying Action?
(OP)
When you've got an angle or a tee section supporting a tension load, you have to amplify the bolt forces for prying action.
Is there a similar need for bolt amplificati0n when designing anchor bolts in fixed base plates where the anchor bolts provide a tie down force for the base plate?
Obviously there is SOME prying action due to the 1.5" or so base plate overhang. Perhaps, since concrete is considerably less stiff than steel, this makes the prying effect insignificant?
Thanks,
Kootenay
Is there a similar need for bolt amplificati0n when designing anchor bolts in fixed base plates where the anchor bolts provide a tie down force for the base plate?
Obviously there is SOME prying action due to the 1.5" or so base plate overhang. Perhaps, since concrete is considerably less stiff than steel, this makes the prying effect insignificant?
Thanks,
Kootenay






RE: Base Plate Prying Action?
RE: Base Plate Prying Action?
Thanks for your post.
I'm doing something a little unusual with this. I'm elongating my base plate and making it as thin as possible in order to make the connection more flexible and minimize the tension in my achor bolts (long story). This is how I've come to be concerned with prying action.
I've always been curious about yield line design in steel. I'll check out the design guides that you recommended.
Kootenay
RE: Base Plate Prying Action?
RE: Base Plate Prying Action?
RE: Base Plate Prying Action?
Old CA SE
RE: Base Plate Prying Action?
RE: Base Plate Prying Action?
I had to do a yield line analysis for a column cap plate on an existing building once. It was terribly overstressed using elastic analysis (450%), but using yield line analysis knocked it down to around 125%. I was quite impressed with that. I guess that's the extra capacity you get out of 4 yeild lines.
Anyway, the point was that I used the procedure outlined in my concrete text (McGregor/Wight), because I couldn't find any easy to follow references for steel. The concrete example was easy to follow and implement.
RE: Base Plate Prying Action?
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RE: Base Plate Prying Action?
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RE: Base Plate Prying Action?
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