P$\mathrm{.}21\mathrm{.}3$ Calculate the shear flow distribution and the stringer and flange loads in the beam shown in Fig. P$.21\mathrm{.}3$ at a section $1\mathrm{.}5$ m from the built$-$in end. Assume that the skin and web panels are effective in resisting shear stress only; the beam tapers symmetrically in a vertical direction about its dongitudinal axis.

Ans. $q_{13}=q_{42}=36\mathrm{.}9\frac{N}{m}m,q_{35}=q_{64}=7\mathrm{.}3\frac{N}{m}m,q_{21}=96\mathrm{.}2\frac{N}{m}m,q_{65}=22\mathrm{.}3\frac{N}{m}m.$

$P_2=-P_1=133\mathrm{.}3kN,P_4=P_6=-P_3=-P_5=66\mathrm{.}7kN$