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Concrete Through-Bolting

Concrete Through-Bolting

Concrete Through-Bolting


Can anyone provide guidance on through-bolting two steel plates to the side faces of a reinforced concrete section? I know I need to consider the bolts in double shear, bearing of the bolts against the plates, and bearing of the bolts on the concrete. However, do I consider the bolts bearing against the concrete over the full width of the section? And, as far as detailing, should the through-bolt holes be drilled 1/8" larger than the bolts and filled with epoxy?

Sketches below.


RE: Concrete Through-Bolting

What level of load are we talking about here and how far to the end of the wall?

RE: Concrete Through-Bolting

If the load is delivered equally through both plates, yes, double shear and I would consider the full length of the bolt in bearing.

If the load is delivered on only one face, this becomes an area where I'm not aware of a nice closed-form solution to the bolt bearing on concrete. What I've seen are a lot of thumb-in-the-air checks and conservatism.

I'd decide on epoxy or not depending on the application and source of loading.

just call me Lo.

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