Figure $11\mathrm{.}6$ Reference figure for Example $1.$

From Table $11\mathrm{.}1,$ the capacity of a single bolt in double shear is found as $31\mathrm{.}8$ kips. The required number of bolts for the connection is thus

$n=\frac{204}{31\mathrm{.}8}=6\mathrm{.}41or7$

Although placement of seven bolts in the connection is possible, most designers would choose to have a symmetrical arrangement with eight bolts, four to a row. The average bolt load is thus

$V_u=\frac{204}{0}=25\mathrm{.}5$kips

BOLTED FRAMING CONNECTIONS

$377$

Problem $11\mathrm{.}2.$A A bolted connection of the general form shown in Figure $11\mathrm{.}6$ is to be used to transmit a tension force of $75$ kips dead load and $100$ kips live load by using $\frac{7}{8}-$in$.$ A$325$ bolts and plates of A$992$ steel with $F_y=50$ksi and $F_u=58$ksi. The outer plates are to be $8in.$ wide and the center plate is to be $12in.$ wide. Find the required thicknesses of the plates and the number of bolts needed if the bolts are placed in two rows. Sketch the final layout of the connection.