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AISC Design Guide No. 1 û Column Base Plates

AISC Design Guide No. 1 û Column Base Plates

AISC Design Guide No. 1 û Column Base Plates

(OP)
I'm almost done writing my own Excel spread sheet for off-set base plates with vertical and moment loads (something Enercalc doesn't have yet) and I'm looking for a little help deciphering the equation for Mpl in Example 15. I'm having "brain freeze", where do they get the 0.67 in the numerator of the second term?   

RE: AISC Design Guide No. 1 û Column Base Plates

Which version of DG1 are you using?

RE: AISC Design Guide No. 1 û Column Base Plates

(OP)
I'm using the Rev. 3/1/03  

RE: AISC Design Guide No. 1 û Column Base Plates

The distance from the reaction to the critical section = 0.67x3.2" (for triangle stress block).   

RE: AISC Design Guide No. 1 û Column Base Plates

(OP)
Kslee1000:

I still don't see it.  The distance A = 5.1", the critical section is at 3.22".  5.1-3.22 = 1.88" is the leg of the similar triangle.  The reaction should be at 2/3 x 1.88 = 1.25" I don't see how they get a lever arm of .67".

The stress is by similar triangles:  (1.88/5.1)x 2.1 = .774 ksi.(their .78 ksi).

RE: AISC Design Guide No. 1 û Column Base Plates

The critical location is under the column flange. The stress block between the flange and the free edge therefore is trapezoidal, that has been broke into 0.78 uniform, and 2.1-1.78= 1.32 (1.3 used) max for the triangle block. Thus, the lever arms are 0.5x3.22 & 0.67x3.22 (3.2 used) respectively. Make sense?

RE: AISC Design Guide No. 1 û Column Base Plates

(OP)
Kslee1000:

Thank you, you cured my Myopia!  Sometimes the simple is not so simple when we try to make it more difficult than it is.  Thanks, for the quick response too.

RE: AISC Design Guide No. 1 û Column Base Plates

I'd be careful, that DG is currently unavailable for a reason.

RE: AISC Design Guide No. 1 û Column Base Plates

(OP)
StructuralEIT:

Yes, I found that out, they are rewriting it; but I believe the rewrite has more to do with the anchor bolts and ACI Appendix D than the plate itself.  The method is very similar to that in Salmon & Johnson.  Thanks for the cautionary reminder.

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