PROBLEM $1\mathrm{.}27$

For the assembly and loading of Prob. $1\mathrm{.}7,$ determine $($a$)$ the average shearing stress in the pin at $B,(b)$ the average bearing stress at $B$ in member $BD,(c)$ the average bearing stress at $B$ in member ABC, knowing that this member has a $1050-mm$ uniform rectangular cross section.

PROBLEM $1\mathrm{.}7$ Each of the four vertical links has an $836-mm$ uniform rectangular cross section and each of the four pins has a $16-mm$ diameter. Determine the maximum value of the average normal stress in the links connecting $($a$)$ points $B$ and $D,(b)$ points $C$ and $E.$