Question $1.[7$ points$]$

$(2$ Points$)$

A$.$ Determine the LRFD design strength of a single angle section L $74\frac{1}{2}.$

Use A$36$ steel and $3/4-$in $$ bolts. Neglect block shear.

$(2$ Points$)$

B$.$ Determine the maximum allowable tensile load for a single LRFD design strength of a single C $1230$ fastened to $\frac{1}{2}-$in$.$ gusset plate as in the accompanying figure. Use A$36$ steel and $1/2-$in $$ bolts.

$(3$ Points$)$

A$.$ Select a pair of $C10$ channels for a tension member subjected to a dead lead of $120$ kips and a live load of $275$ kips. The channels are placed back$-$to$-$back and connected to a $3/4-$in gusset plate by $7/8-$in $$ bolts. Assume A$588$ Grade $50$ steel for the channels and assume the gusset plate is sufficient. The member is $25ft$ long. The bolts are arranged in two lines parallel to the length of the member. There are two bolts in each line $4$ in on center.