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Post Installed Anchor Capacity in Bond Beams

Post Installed Anchor Capacity in Bond Beams

Post Installed Anchor Capacity in Bond Beams

(OP)
I am designing a carwash using wood trusses at the roof and 8" cmu block for the walls. I am planning on connecting a ledger board to a masonry bond beam using post installed anchors in order to handle in plane and out of plane wind loads from the walls (I will also provide some blocking/strapping to prevent cross grain bending and drag the load into the diaphragm). As the roof gradually slopes up, the truss top chord gradually slopes upward and the edge distance of the anchor to the edge of the bond beam will get smaller and smaller. I think that a solution for this would be to just stack two or three bond beams on top of each other and fully grout all of them in order to maintain proper edge distances for the anchors but am not sure if 3 separate fully grouted bond beams would act like a single 24" tall beam with respect to anchor edge distances requirements.

Does anyone have any input here?

Thanks in advance.

RE: Post Installed Anchor Capacity in Bond Beams

Vertically staggered and overlapped bond beams. Remember to provide cxontinuous/spliced chord reinforcing too.

Mike McCann, PE, SE (WA)


RE: Post Installed Anchor Capacity in Bond Beams

(OP)
I guess to focus my question a little more, the Hilti HY70 Adhesive requires a minimum edge distance of 4" when installed in the face of grouted masonry. My concern is that if the extents of the bond beam are what determines the edge distance for the anchor, then even if you overlap bond beams, there may be some sort of a blow out issue because the separate bond beams may not act monolithically. So the question is more, if you overlap bond beams one on top of another, do they act as one beam with regards to anchor edge distance?

RE: Post Installed Anchor Capacity in Bond Beams

Use only the bottom course as a true bond beam block. Use the upper two courses as knock-out web blocks, then it will act as a true single beam.

On another note, I would advise against wood roof in a car wash. Especially with metal plates

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