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Re: Anchor bolt sleeve - Pretension force

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ASCE 7-10 15.7.5 and C15.7.5:
Gauge length=(8)x(anchor diameter).

V. Steve Gordin PhD
Licensed Structural Engineer
SGE Consulting Structural Engineers
2081 Business Center Drive #105
Irvine CA 92612

> On Oct 2, 2015, at 8:02 AM, Vasu, Ravi <Ravi.Vasu(--nospam--at)> wrote:
> List,
> I have an anchor bolt case for  a compressor foundation done recently. 
> A sleeve, 2 ft long is provided at top for a 2.5" dia(A354, Grade BC), 6.5 
> ft long. The bond breaking tape below the sleeve is missed by construction. 
> The anchor bolt needs to be pre tensioned for 125 kips for 2.5 inch dia 
> bolt suggested by compressor vendor. I have gone through several articles. 
> One of the articles by Rick Drake(Fluor) says,  Sleeve at top is sufficient 
> for the stretching of the bolt.  My concern is the concrete below the 
> sleeve may go through some cracks (bond strength available is small < 20 
> kips) before the cone action starts from the bottom nut of the A bolt to 
> counteract the pretension force.  If sleeve is sufficient(need back up 
> tech. article), how much length is required?.
> Let me know your thoughts on this.
> Thanks

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