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Civil Engineering/Why use Normal stress formula to calculate Shear stress in bolts ?


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 ?

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.


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Babak Esmailzadeh Hakimi


I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!


I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.

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Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran

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