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- Why use Normal stress formula to calculate Shear stress in bolts ?

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Say a bolt is used is used to join 2 plates, Shear stress is Force/ bolt area.

Shear stress = P/A

This formula looks like NORMAL stress , isn't it ?

What is the stress distribution in bolts ?

But there is also shear stress = V Q /I b

Why not use the above formula to calculate shear stress in bolts ?

I am confused ?

Thanks.

Dear Ben

You know that VQ/IB is the shear stress related to moment distribution along the member span ( see popov ) then it is not suitable for a direct shear application like in a bolt. in addition a plastic redistribution of stresses make the V/A formula suitable indeed with a carefully adopted margin of safety.

Regards

BEH

Civil Engineering

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