Problem $2$:

The plan below shows the conceptual plan for a building with perimeter bearing walls. Your client has asked you to design roof framing for this building and neatly sketch a schematic framing plan showing all member sizes.

Determine appropriate dead and live gravity loads. Neglect snow, rain, wind, and seismic loads.

Verify appropriate stress and deflection limits$.$ Use Doug Fir$-$Larch #$1.$

Assume bearing stresses and connections to the walls are OK$.$

Assume the roof is approximately flat, but has adequate slope for drainage.

The architectural drawings suggest that the roof will likely be $3$ ply felt $\frac{w}{?}$ gravel over $\frac{1}{2}$ plywood, $\frac{w}{?}$ loose insulation and a gypsum board ceiling.

Members must be spaced at $24"$ o$.$c$.$

The architectural program allows one row of interior columns at ${20}^{\text{'}}--"$ o$.$c$.$ minimum spacing. You may add these columns if they help your design, but they are not required.

Calculate the average weight of your framing system in psf$,$ not including the roofing sheathing, insulation, or ceiling $($i$.$e$.$ framing weight only$).$

Try to limit your calculation to $1$ or $2$ neat & legible pages.

Future homework may involve modifications to your design and comparison of results, so you may want to save a copy of your solution for future reference.

Problem $2$: $($continued$)$

Design for $2$ Options:

Option $1-$There are no center girders or columns. Rafters span $20$ feet Option $2-$Girders located at center of building, supported by posts. Design rafters and girders

${60}^{\text{'}}-0$

$2$