(Solved): 8.50 The elevation of the end of the steel beam supported by a concrete floor is adjusted by means ...

8.50 The elevation of the end of the steel beam supported by a concrete floor is adjusted by means of the steel wedges $E$ and $F$. The base plate $CD$ has been welded to the lower flange of the beam, and the end reaction of the beam is known to be $100\mathrm{kN}$. The coefficient of static friction is 0.30 between two steel surfaces and 0.60 between steel and concrete. If the horizontal motion of the beam is prevented by the force $\mathbf{Q}$, determine $(a)$ the force $\mathbf{P}$ required to raise the beam, $(b)$ the corresponding force $Q$.