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RE: shearheads/ studrails

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Shearheads and studrails are shear reinforcing systems for flat concrete slabs at columns to help with punching shear.

 

Shearheads are rolled structural shapes embedded in the slab.  They cross over the column and can greatly increase the critical section perimeter.  See ACI 318 section 11.12.4).

 

A studrail is a proprietary product composed of headed studs (similar to, but not the same as Nelson studs) welded to steel bars.  See http://www.studrail.com

 

 

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Jason Kilgore

Leigh & O'Kane, LLC

Kansas City, Missouri


From: Andrew Kester [mailto:akester(--nospam--at)bbma.com]
Sent: Wednesday, May 26, 2004 7:25 AM
To: seaint(--nospam--at)seaint.org
Subject: shearheads/ studrails

 

Can someone explain what shearheads and studrails are exactly? I was guessing a shearhead is the same as a headed stud? If you are looking for literature on headed stud design, we use PCI, Volume #5. BTW, there was a big drop off in headed stud capacities from Vol#4 that everyone should be aware of, we had to revise lots of our typical tilt-panel connections....

 

Also, someone mentioned how to show reactions on plans for the fabricator. We put the reactions, in kips, and the end of each beam right on the plans. We state on the plans these are factored loads according to LRFD. We only would do this for shear connections, steel to steel. We design any moment or peculiar connections....  Even if the fabricator doesn't design them, I have found this method great for QC checks, shop dwg reviews, etc. Your CAD tech or you can put the reactions on their own layer if you don't want them to go out on your 100% docs. For in house QC we can sit down with our calcs/RAM printout and review all of them. It makes checking our connection schedules/details easy as well.

 

Andrew Kester, PE

Longwood, FL