Shear connectors with partial depth precast deck panels
Shear connectors with partial depth precast deck panels
(OP)
Hi All,
I’m working on digging up some information regarding the use of shear connectors on steel girder bridges where partial depth precast deck panels are used. Specifically, when shear connectors are used in combination with partial depth precast concrete deck panels, how far do the shear connectors need to project into the CIP portion of the deck slab (if at all)?
AASHTO LRFD requires that shear connectors project a minimum of 2" into the deck slab, but the code is silent on whether the partial depth precast panels count toward this requirement. Separately, PCI New England has a standard detail that requires the shear studs extend at least to the top of the precast deck panel. Other than these two sources, I've been able to dig up only a small amount of guidance on how to approach this issue.
The issue is that having the studs extend up into the CIP portion of the deck slab creates clear cover issues at the top of the stud as haunch height varies. Coversely, not having the studs project into the CIP deck slab creates questions about whether full composite action is being developed.
So, what have your experiences been with this situation? What guidance do your state/local agencies provide when dealing with these situations? I’ve heard some interesting approaches on the topic so far and am interested to hear some of the approaches used by other agencies.
Thanks!
I’m working on digging up some information regarding the use of shear connectors on steel girder bridges where partial depth precast deck panels are used. Specifically, when shear connectors are used in combination with partial depth precast concrete deck panels, how far do the shear connectors need to project into the CIP portion of the deck slab (if at all)?
AASHTO LRFD requires that shear connectors project a minimum of 2" into the deck slab, but the code is silent on whether the partial depth precast panels count toward this requirement. Separately, PCI New England has a standard detail that requires the shear studs extend at least to the top of the precast deck panel. Other than these two sources, I've been able to dig up only a small amount of guidance on how to approach this issue.
The issue is that having the studs extend up into the CIP portion of the deck slab creates clear cover issues at the top of the stud as haunch height varies. Coversely, not having the studs project into the CIP deck slab creates questions about whether full composite action is being developed.
So, what have your experiences been with this situation? What guidance do your state/local agencies provide when dealing with these situations? I’ve heard some interesting approaches on the topic so far and am interested to hear some of the approaches used by other agencies.
Thanks!





RE: Shear connectors with partial depth precast deck panels
I think this is will help:
https://
Click on BD SS8-R1
RE: Shear connectors with partial depth precast deck panels
Also for large haunches #4 hairpin bars are used to further reinforce the haunch.
Regards,

Qshake
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RE: Shear connectors with partial depth precast deck panels
I've been looking at various DOT websites and browsing their standards, but I've only found a few that have definitive guidance on this issue. Here in the Northeast the only agencies that have set standards (that I've come across) are MaineDOT and MassHighway...
RE: Shear connectors with partial depth precast deck panels
RE: Shear connectors with partial depth precast deck panels
I'm still surprised at how few agencies address this issue. I've still only found a handful that address it.
RE: Shear connectors with partial depth precast deck panels
RE: Shear connectors with partial depth precast deck panels
RE: Shear connectors with partial depth precast deck panels
Regards,
![[pipe] pipe](https://www.tipmaster.com/images/pipe.gif)
Qshake
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RE: Shear connectors with partial depth precast deck panels
RE: Shear connectors with partial depth precast deck panels
That's interesting. Do you recall if the DOT required any corrosion inhibiting admixtures (e.g. Calcium Nitrate Solution) in the precast panel mix design? What kind of surface were the panels given during fabrication? We use a raked finish to produce a +/- 1/4" profile.
So the expected to be able to re-use the panels when the redecked the bridge? Interesting, I always thought they would just remove them in their entirety.
RE: Shear connectors with partial depth precast deck panels