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Simultaneous Shear And Tension on threaded rod

Simultaneous Shear And Tension on threaded rod

Simultaneous Shear And Tension on threaded rod

(OP)
When there is simultaneous Tension (fa) and Shear(fv) on a threaded rod (or a bolt) would you verify separately each case against the allowable fv/Fv <1 and fa/Fa<1 , or would you add those to do one verification fv/Fv+fa/Fa < 1 ?

RE: Simultaneous Shear And Tension on threaded rod

You need to account for shear/tension interaction.  For bolts, see AISC spec section J.  For threaded rods, the unity equation you gave is conservative.

RE: Simultaneous Shear And Tension on threaded rod

Assuming the stresses are below yield, the interaction formula is:

(σ/σy) + (τ/τy) ≤ 1

where

σ = applied tensile stress
σy = tensile yield stress
τ = applied shear stress
τy = shear yield stress


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RE: Simultaneous Shear And Tension on threaded rod

I erred in my previous post - each ratio should be squared:

(σ/σy)2 + (τ/τy)2 ≤ 1

where

σ = applied tensile stress
σy = tensile yield stress
τ = applied shear stress
τy = shear yield stress

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: Simultaneous Shear And Tension on threaded rod

(OP)
Thanks CoryPad,
Can you give a reference on that formula?

RE: Simultaneous Shear And Tension on threaded rod

Handbook of Bolts and Bolted Joints, edited by Bickford and Nassar, page 408.  More generically, it can be derived using the von Mises/distortion energy yield criterion.



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RE: Simultaneous Shear And Tension on threaded rod

(OP)
Thanks. I appreciate your help.

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