MecMovies 4.0 : M15.3: Principal Stresses in a Rectangular Tube Beam

scene 6 of 14

Constructing the moment diagram

Considering the segment
from $x = 7 m$ to $x = 10 m$

  area under shear
      diagram $= - 9.00 k N - m$
  concentrated
     moments $= 0.00 k N - m$
  change in bending
     moments $= - 9.00 k N - m$

  at $x = 7 m$ ,    $M = + 9.00 k N - m$
  change in bending
         moment       $= - 9.00 k N - m$
  at $x = 10 m,$    $M = 0.00 k N - m$