Clear Cover requirement at the end of a Stud

[ForrestLowell]

I have an embedded plate in a wall that have studs extending to within 0.5 inches of the far side. What is the clear cover requirement for this distnace. ACI 349 B.8.3 sort of addresses it, but that is more for edge distances. Section 7.7 only covers for reiforcing. the plates are cast-in-place. Thanks for any help!

 

[Lion06]

I would not use less than the cover requirements in ACI 318 - chapter 7.

 

[ForrestLowell]

So after much discussion with several of the senior engineers at my company, we determined there was actually no clear cover requirements. However, if the wall turns out to be exposed to the outside, we are going to galvanize them. But the code does not specifically address it.

 

[civilperson]

ACI requires cover for all structural steel elements. I would include embedded plate and headed studs in this grouping and follow ACI 7.7. Rust stains from tie wires that are in the cover space are one example of why this requirement applies to non-rebar. (See ACI 318 -08, 7.7.5)

 

[WillisV]

civilperson - what is your feeling on the AISC requirement of a minimum 1/2" cover above the studs on a composite beam (as opposed to 3/4" if you assumed ACI controlled)?

 

[civilperson]

A minimum can always be exceeded. Use the most restrictive rule. At least 1/2" in AISC 16.1-84 and 3/4" in ACI 318-08, 7.7.2.

 

[WillisV]

Agreed, but I would have no problem justifying using 1/2" in that instance. In reality the strength of the stud in shear would be the same even if the top of the stud head was flush with the concrete. The AISC cover requirement is simply to help prevent studs from sticking out due to over-cambering as well as for corrosion and firerating issues.

 

[KBVT]

Willis has it, the AISC strength calculations of the studs are based on the pull-out cone of the stud, depending on how much concrete is BELOW the stud, not above it. I think the 1/2" cover can be easily justified.