PROBLEM $6\mathrm{.}1$

For the built$-$up beam of Prob. $6\mathrm{.}1,$ determine the allowable shear if the spacing between each pair of nails is $s=45mm.$

PROBLEM $6\mathrm{.}1$ Three full$-$size $50100-mm$ boards are nailed together to form a beam that is subjected to a vertical shear of $1500$ N $.$ Knowing that the allowable shearing force in each nail is $400$ N $,$ determine the largest longitudinal spacing $s$ that can be used between each pair of nails.