Constructing the shear diagram
Considering the segment
from x = 12 m to x = 12 m
area under load
diagram = 0.00 kN
concentrated
forces = +20.40 kN
total shear force
change = +20.40 kN
at x = 12 m, V = -20.40 kN
total shear force
change = +20.40 kN
at x = 12 m, V = 0.00 kN