(Solved): Calculate the normal stress and shear stress acting on an element G, 150mm from the top surfa ...

Calculate the normal stress and shear stress acting on an element G, $150\mathrm{mm}$ from the top surface of the beam, in the section $G$ to the left of the point load $F_{wt}$ (water tank load) as shown in the bottom figure and then determine the principal planes and the principal stresses.