$9\mathrm{.}10$ Given: The one$-$story building in Figure $9.$D$.$ Roof sheathing is $\frac{15}{{32}^{-}}$ in$.32/26$ span$-$rated panels spanning between roof joists spaced $24$ in$.$ o$.$c$.$ Nails are $10$d common. For the transverse strength level seismic force, the panel layout is load case $1.$

TRANSVERSE FORCE

FIGURE $9.$D

Find: $a.$ Design the roof diaphragm, assuming that only the exterior walls are effective in resisting the lateral force. Show all design criteria including span$-$width ratio, nailing, and blocking requirements. Omit blocking where possible. Do not consider deflection of the diaphragm.

b$.$ Redesign the roof diaphragm, assuming that the interior

and exterior walls are effective shearwalls. Show all criteria, except deflection.

c$.$ Compare the maximum chord forces for a and $b.$

d$.$ Plot the collector force diagram for the interior shearwall.