FIGURE P$\mathrm{.}18\mathrm{.}11$

P$\mathrm{.}18\mathrm{.}12$ The steel frame shown in Fig. P$\mathrm{.}18\mathrm{.}12$ collapses under the loading shown.

Calculate the value of the plastic moment parameter $M$ if the relative plastic moments

of resistance of the members are as shown. Calculate also the support reactions at

collapse.

Ans. $M=56kN.$ Vertical: $32kN$ at A$,48kN$ at D$.$ Horizontal: $13\mathrm{.}3kN$ at A$,$

$33\mathrm{.}3kN$ at $D.$