Shear force is calculated at each point on the beam. Downward forces are negative, upward forces are positive.
Moments about points are calculated as force multiplied by perpendicular distance. Clockwise moments are negative. Anti clockwise moments are positive.
The Attempt at a Solution
SF @ A = -6kN
SF @ B = -4kN
SF @ C = 12kN
SF @ D = 12kN (same as C)
[email protected]=6kNx1+12kNx0.5 = 12kN CCW
[email protected]=6kNx1.5+4kNx0.5=11kN CCW
[email protected]=6kNx3+4kNx2-12kNx1.5=8kN CCW
Answers given are:
Vmax= -10kN (I can see this from the shear force diagram)
Mmax = -11kN.m (point c?)
Points of contra-flexure = C (not sure how this is calculated)