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Custom plate washer to increase Appendix D capacity

Custom plate washer to increase Appendix D capacity

Custom plate washer to increase Appendix D capacity

(OP)
On appendix D, the ANC is calculated from the center of the bolt. If I add a thick custom washer, is there a way to increase this number? I feel like my ANC should be higher? Does Appendix D cover this anywhere?

RE: Custom plate washer to increase Appendix D capacity

I only have my ACI 318-05 at home with me. I'm almost certain that 318-08 allows you to calculate Anc starting from the edge of your plate washer, not the center. I've never used the provision, but I'm almost certain it's there.

RE: Custom plate washer to increase Appendix D capacity

I've done this when I needed a ductile failure of the anchor rods. Just make sure the plate can handle the uplift load in bending, but that shouldn't be too difficult to achieve.

RE: Custom plate washer to increase Appendix D capacity

You can use a little tiny washer if you put it and the head of the anchor bolt at the bottom of the footing and calling it a through-bolt, which isn't covered by App D.
You will have to excavate a pocket around the head of the anchor to provide adequate concrete corrosion cover. But this way, you can avoid App D altogether.

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