Pullout Capacity - Steel Handrail Embedded in Concrete 4

[codySTR]

Exhibit A: A 1.5" I.D. steel pipe is used as a handrail and as the vertical posts connected to the handrail). Per the Landscape Architect's detail, said handrail posts are to be embedded X inches into my reinforced concrete stair slab / beam. The concrete base will be core drilled, the steel pipe post inserted into this void, and the gap between pipe and concrete filled with non-shrink grout with a higher f'c than the concrete, which has a f'c=4000psi. How on earth do I quantify the pullout capacity of the handrail post?!

This seemed very simple to me until I started looking for equations, etc.... The pipe is smooth (i.e. not rebar with deformations). I thought there'd be an equation in ACI 318-14, but I haven't seen one.

 

[r13]

I love it - perforated pipe, definitely helps in pull out strength for a certain duration, though both can't be quantified.

 

[Tomfh]

Drilling holes allows you to use higher shear bond strength at the area of the holes, as the slip plane has to pass thru monolithic grout.

As noted already, the basic bond strength should be ample. A modest value of 25 psi provides nearly 1000 lbs of uplift resistance against slip.