The three beams below are loaded the same and have the same support conditions. However, one has a moment release just to the left of C, the second has a shear release just to the right of C, and the third has an axial release just to the left of C. Which beam has the largest maximum moment?
First, find support reactions, then plot axial force (N), shear (V) and moment (M) diagrams for all three beams. Label all critical N, V & M values and also the distance to points where N, V &/or M is zero.
(a)

(b)

(c)

PL at C ! PL at B Moment release Cy Dy | PL at C 4 D B 2 PL at B Shear release D Ar Cy 4 PL at B Axial force Ar Ay release