Since in the actual beam the deflection of the point B is zero which implies that the deviation of point B from the tangent at A is zero. Thus,

Taking moment about A , the moment at A is given by

The bending moment diagram of the beam is shown in Figure 5.2(e).

(b) Conjugate beam method

The corresponding conjugate beam of the propped cantilever beam and loading acting on it are shown in Figure 5.2(f).

The unknown R can be obtained by taking moment about B i.e.