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Recommended Anchor Bolt Torques
2

Recommended Anchor Bolt Torques

Recommended Anchor Bolt Torques

(OP)
Is there a table or a publication of recommended anchor bolt torques for cast-in-place anchors?

Hilti provides maximum anchor bolt torques base on the bonding of their epoxies.

For cast-in-place anchors, I imagine that it could very based on allowable concrete strength and rather a nut or a 3" square plate was embedded at the end of the anchor.

RE: Recommended Anchor Bolt Torques

Hilti's torques are usually there to set their anchors.  
I would only use snug tight anchor bolts.  You shouldn't be counting on any slip critical action.  

RE: Recommended Anchor Bolt Torques

Agree with JedClampett...no need to torque an anchor bolt.

RE: Recommended Anchor Bolt Torques

Quote:

Is there a table or a publication of recommended anchor bolt torques for cast-in-place anchors?
No, properly designed anchor bolt capacity is based on the tensile strength of the bolt. Torque does not account for friction between the nut / bolt / washer. Anchorage in concrete should be such that "anchor bolt design ductility is assured by causing a failure mechanism that is controlled by yielding of the anchor bolt steel, rather than brittle tensile failure of concrete."

See the AISC paper "Design of Headed Anchor Bolts" at this link:
http://www.solutionsforstructuralsteel.org/assets/0/544/546/670/f8d8e595-3a72-47cd-befd-4411ed39c32a.pdf

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RE: Recommended Anchor Bolt Torques

Get the small softcover book by the ASCE called "Wind Loads and Anchor Bolt Design for Petrochemical Facilties". On page 4-3 it recommends 1/3 the pretension load. AISC is silent on this issue. The typical formula used is T=KDP. The K is very tricky but ASCE uses 0.20 on page 4-5.

RE: Recommended Anchor Bolt Torques

One of the standards we use specifies that higher-strength anchor bolts are to be pretensioned to x% of yield, whereas typical 36ksi bolts are not.  (not related to slip-critical action)

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