Simultaneous Shear And Tension on threaded rod 1

[structurebeton]

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 ?

 

[Taro]

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.

 

[CoryPad]

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

(&[ignore]sigma[/ignore];/&[ignore]sigma[/ignore];_y) + (&[ignore]tau[/ignore];/&[ignore]tau[/ignore];_y) &[ignore]le[/ignore]; 1

where

&[ignore]sigma[/ignore]; = applied tensile stress
&[ignore]sigma[/ignore];_y = tensile yield stress
&[ignore]tau[/ignore]; = applied shear stress
&[ignore]tau[/ignore];_y = shear yield stress




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

 

[CoryPad]

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

(&[ignore]sigma[/ignore];/&[ignore]sigma[/ignore];_y)² + (&[ignore]tau[/ignore];/&[ignore]tau[/ignore];_y)² &[ignore]le[/ignore]; 1

where

&[ignore]sigma[/ignore]; = applied tensile stress
&[ignore]sigma[/ignore];_y = tensile yield stress
&[ignore]tau[/ignore]; = applied shear stress
&[ignore]tau[/ignore];_y = shear yield stress

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

 

[structurebeton]

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

 

[CoryPad]

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.





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

 

[structurebeton]

Thanks. I appreciate your help.