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## Homework Statement

http://postimg.org/image/9va37id55/

The question is to find the shear stress at the points A, B and C. The solution uses the sectioning planes aa, bb and cc to do so.

For example, at C, how should I know whether to use a horizontal or vertical sectioning plane. Also, how should I know which portion of the beam i would have to consider as A', the bit to the left or right of the sectioning plane ?

## Homework Equations

Shear Stress(Flange) = q(Flange)/thickness(Flange)

where q(flange) = VQ(Flange)/I

Shear Stress(Web) = q(Web)/thickness(Web)

where q(Web) = VQ(Web)/I

V is the transverse shear force

Q = A'y" is the first area moments of the area A' with respect to the neutral axis