Handrail/Guardrail Embedment 2

[adamt83]

I've searched the several threads on this topic but haven't came to a clear understanding of the design of the embedment of handrail/guardrail in concrete. I realize that there is some debate as to whether core drilling posts in concrete slabs or retaining walls is the ideal installation over other alternatives (base plates, cast-in-place sleeves such as EZ Sleeve, etc.), but in my experience embedment of steel, stainless, or aluminum (with coatings) posts in concrete with non-shrink grout is commonplace. Can someone clarify the procedure to calculate the required embedment depth? Or even point me to some resources? Thanks!

 

[Ron]

Michael...I think you're right...I considered that, but in the interest of a "quickie" I drew it as shown, without any further thought.

 

[NITTANYRAY]

Racookpe,

You should be using a 1 1/2 standard pipe not 1 1/4"
A 200# concentrated load at 42" above grade requires a section modulus of at least .263 if you are using a code that permits a 1/3 stress increase for guardrails.

While fence pipe can be obtained in grade 50 steel most handrails are made with A53 steel which is 35 KSI with an allowable bending stress of 24 KSI.

A Pipe 1 1/4 STD has a section modulus of only .235.