Hello, Can someone please explain to me how the formula of secondary shear force was obtained in this problem? Where did the denominator (2)(36) come from? I understand the way primary force was calculated but I am confused about the secondary shear force formula. Also, what will be this secondary shear force formula if there were 2, 4 or 5 bolts in this problem. I have attached the pictures for problem and solution from NCEES exam. I really appreciate your help. Mod Note - Edited to remove copyrighted material.