$3\mathrm{.}6-5$ Use load and resistance factor design and select an American Standard

Channel shape to resist a factored tensile load of $180$kips. The length is

$15ft,$ and there will be two lines of $\frac{7}{8}-$in$.$ diameter bolts in the web, as

shown in Figure P$3\mathrm{.}6-5.$ Estimate the shear lag factor $U$ to be $0\mathrm{.}85.($In a

practical design, once the member and bolt layout are selected, the value

of $U$ could be computed and the member design could be revised if neces$-$

sary.$)$ Use A$36$ steel.