Problem $5$

Use LRFD and select an American Standard Channel shape for the following tensile loads: dead

load $=70$ kips, live load $=90$kips, and wind load $=90$ kips. The connection will be with two $9$

in$.$ long longitudinal welds. Use an estimated shear lag factor of $U=0\mathrm{.}85.$ Once the member

has been selected, compute the value of $U$ with Equation $3\mathrm{.}1$ and revise the design if necessary.

The length is $20$ ft $.$ Use $A572$ grade $50$ steel.