$5\mathrm{.}10-12$ The T$-$beam shown in the figure has

cross$-$sectional dimensions: $b=210mm,t=16mm,$

$h=300mm,$ and $h_1=280mm.$ The beam is sub$-$

jected to a shear force $V=68kN.$

Determine the maximum shear stress ${}_{\text{m}\text{a}\text{x}}$ in the

web of the beam.

PROBLEMS $5\mathrm{.}10-12$ and $5\mathrm{.}10-13$