ECCENTRIC BASE PLATE PULLOUT CALC.

[F1955]

I have an eccentric base plate located at the corner of a pier with uplift that has 5 anchor bolts. These bolts do not follow any PCI 4 bolt pattern. Does anyone know where to look for formulas or what they do in this situation? As always, many thanks for your ideas!

 

[jike]

If you have FEM software available, perhaps you could model it on that.

 

[UcfSE]

ACI 318-02 Appendix D covers embedded anchors and has an adjustment factor for eccentric loading. I would try that. Seems like the design would be standard procedure if you can get a good handle on the area of the concrete cone or truncated pyramid to use and the eccentricity of the load with respect to the bolt group c.g.

 

[twich]

To calculate the AB stress in similar cases I have used:

fs = P/A +/- (Mc)/I and keep the signs straight for the direction of load with I being the moment of inertia for the bolt group.

 

[tincan]

Agree with Twich, have designed similar as column reinforcement. S will vary with the AB locations, but still
P/A-+M/S is a good rule, Apply stress reduction if applicable.
Best, Tincan.