stair stringer to wall connection

[structSU10]

See attached image of the detail. I am wondering what some thoughts are here. I analyzed this as an expansion bolt with standoff in Hilti and found it to have half the capacity of a flush bolt. Does the pipe sleeve help the situation much more? I can only imagine it helps modestly, possibly reducing the induced moment from standoff slightly, but maybe there is an additional tension on the bolt?

 

[CANPRO]

Maybe you can eliminate the stand off all together. Have a bracket fabricated that can be bolted directly the the wall then the stringer can be bolted to the bracket.

 

[structSU10]

Thats the way I am leaning, but some of the stair has already been constructed this way due to interference with doors.

 

[BAretired]

What you need is solid steel packing welded to the channel web between the channel web and the concrete with a hole drilled just big enough to receive the anchor. Then, I believe, you would get full benefit for the Hilti expansion bolt.

BA

 

[XR250]

I agree with BA. You could also weld a clip angle to the bottom of the stringer and bolt that to the wall.

 

[hokie66]

Stair stringers usually span between floors and landings. Why is it connected to the wall in this manner?

 

[structSU10]

This is the connection at the landing - they are using two expansion bolts in the fashion at each end of the stringer at the landings.

 

[hokie66]

In that case, I would do as ExcelEngineering suggested. Provide support under the landing rather than rely on the bending of these bolts.