Question

If the support reaction at A, for the beam shown in Figure 3, is zero, then find force ‘P’ and the support reaction at B. 

Answer 1

ΣFx = 0
ΣFy = 10 – 60 + R – P = 0
R – P = 50 ……….(1)
`ΣM_B^(F)` = (Px2) – (60x1.667) – (10x7) = 0
P = 85.01 kN ……..(2)
From (1) and (2)
R = 135.01 kN

The magnitudes of force P and reaction R are 85.01kN and 135.01kN respectively.