For a U$-$section beam with the following dimensions: b $=120$ mm$,$ d $=150$ mm$,$ calculate the shear centre distance, e by using Equation $1$ given below. When an unsymmetrical beam is loaded, the shear force within the beam element will cause the beam section to twist, as shown in Figure $5.$ However, if the beam is loaded at its shear centre, S as shown in Figure $6,$ the external applied moment $($P $\backslash$times e$)$ will be balanced with the summation of internal moments from the beam flanges $($ M$\_$A$=$F$\_$f d$).$ Hence, the beam will only bend without twist. Figure $5$ The twisting of a $\text{'}$U$\text{'}$ section under load