Find the lightest equal legs angle section is

And

Find the design strength of the selected wt$5$ section

Select the lightest WT$5$ available to support a factored tensile load of $P_u=200k$ and satisfy the excessive

vibration limit for tension members. Show all iterations and details. Assume there are two lines of $\frac{3}{4}$ in$.$

diameter bolts in the flange with three bolts in each line. The botls in each line are $\frac{31}{2}in.$ on center. The

tension member is $20$ ft long. Grade $50$ is used $(F_y=50$ksi,$F_u=65$ksi $).$