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Re: Torque vs. Tension in Bolts

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Go to www.cedarhouse.co.uk they have a programme (freeware) that calculates
torque based on bolt size, friction factor and required tension.



At 10:20 PM 7/13/99 -0700, you wrote:
>Can someone tell me a rule-of-thumb formula or another method to convert
>the torque value placed on a bolt to the tension value.  I had a formula
>that a mechanical engineer gave about 10 years ago that I have now
>aparently misplaced and it is something I don't recall ever seeing in a
>text book.  I do read, however, in the AISC Connections book that any
>published method of conversion is not acurate.
>
>My situation is for the use of expansion anchor bolts in concrete to
>connect a wood plate (sill or ledger).  The wood will crush before the
>required torque is achieved without a plate washer.  I want to determine
>just how big these plate washers need to be but need to convert torque
>value to do this.
>
>Do others call out plate washer sizes in details, use more expensive epoxy
>anchors, or is this something that gets ingnored and the anchors are not
>always installed properly?
>Thanks in advance.
>
>Peder Golberg, PE
>Portland, Oregon
>
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