Shear stress single.and double calculation method,.how to.understand ques

How to calculate the shearing stress in celvis with concept

I assume you mean clevis for celvis. It is better if you have a specific problem so that we can deal with it according to your need. Assuming again you are talking about the bolt in clevis that connect the two rods, this bolt is under double shearing stress. Do you have any specific problem involving clevis at hand?