$(18)$

$5.$ From point $($A$)$though point $($D$)$ sketch the influence lines for: a$)$ bending moment over support $($B$)$ and b$)$ shear force immediately right of support $($B$).$ Using the slopedeflection method or moment$-$distribution method, analyze the structure and calculate and label the ordinates of both influence lines at the centre line of the structure $-$ the centre of span $($B$)($C$).$ The three members have the relative EI values shown.