Wood building sill plate anchor bolts embedment 3

[Engin1]

Hello everyone,
I have a question about the anchor bolt embedment for sill plates. Based on IBC 2015 chapter 2308.3.1, the anchor bolt shall be embedded at least 7". The projects I have done, I always show a 12" embedded cast in place bolt, however, the contractors always refuse to use cast in place bolts, they want to use Simpson Titen HD bolts(

http://embed.widencdn.net/pdf/plus/ssttoolbox/xdnkicr9rn/C-A-2018-p115-123.pdf).

Page 185 shows 3/4" dia has 6 1/4" nominal embedment depth. Has anyone used this before? Is it acceptable since the embedment depth is less than 7"?
Please help, thanks!

 

[atrizzy]

I haven't used these Simpson products, but if they have published values for shear capacity that are acceptable, I don't see why not.

 

[Engin1]

atrizzy, Thanks! Is the embedment an issue? Since this kind anchor cannot have 7" embedment as code specifies.

 

[AaronMcD]

I've used less than 7" embedment for epoxy anchors at existing foundations. I think the 7" is for non-engineered anchors.

http://www.hellodwell.design

 

[Aesur]

We typically use NDS table 12E to design the anchors attaching the wood sill to the concrete. This talbe requires 6" or more embed. This would meet the requirements of 2308.1 "compliance with other provisions of the code". Note that when using post installed anchors special inspections are required, I have seen too many cases where the contractor didn't perform the SSI, didn't clean the holes properly, or drilled and oversize hole because they didn't have the proper drill bit on site. All of these can cause issues down the road; make sure the special inspections are performed and that the installation procedures are followed.

 

[North2South]

Make sure you have a note on your drawings about the concrete being 21 days old before using an epoxy adhesive. I don’t have my code in front of me but it is in the newer ACI 318. Sometimes that can mess with the contractors schedule and may change their mind.

 

[BridgeSmith]

In shear applications, it should be ok, provided the anchor has sufficient shear capacity with the concrete strength used.

In tension applications, we don't allow epoxy anchors on our bridge projects, due to the extremely poor track record contractors have with getting the installation right. They either fail to clean the holes properly or fail to mix the epoxy thoroughly, and then the anchors pop out when they're loaded. We used to show cast-in headed bolts, but the contractors kept 'forgetting' to cast them in, opting to epoxy threaded rods in after casting. Now, where we require tension capacity, we detail u-bolts so they actually have to cast them in.

We haven't seen any installations with mechanical post-installed anchors, probably because wedge anchors, etc. in the sizes we would need (1-1/2"+) are difficult or impossible to find.

Rod Smith, P.E.

 

[oldrunner]

Titen HD anchors are screw in anchors. One must drill a hole in the concrete and then screw in the anchor. Simpson provides an approved data sheet for this which you can provide to the building department. No epoxy involved. Follow their directions with the proper size bit and cleanout. Actually done this on my own (old) home which had almost all original anchors mislocted.

On epoxied anchors a few years ago, special training (or certification) was required and there wasn't enough training locations. Has this been resolved?

Yes installation has been a problem. Pull one "installed" bolt out of a location with contractor watching (after he had complained about our inspection requirements.)