$[5\mathrm{.}12-6]$ A rigid frame ABC is formed by welding two steel pipes at $B($see figure$).$ Each pipe has crosssectional area $A=11\mathrm{.}313103m{m}^2,$ moment of inertia I $=46\mathrm{.}373106m{m}^4,$ and outside diameter $d=200mm.$ Find the maximum tensile and compressive stresses and, respectively, in the frame due to the load $P=8\mathrm{.}0kN$ if $L=H=1\mathrm{.}4m.$