QUESTION $3(15$ marks$)$

For the T$-$section shown in Figure $3$:

a$)$ plot the shear stress distribution if the permissible maximum shear stress in the

section must not exceed $75$MPa

b$)$ determine the maximum allowable spacing $(s)$ for the nails that join the web and

flange if each nail can resist a shear force of $7\mathrm{.}5kN$