$($ref: section $1)$

Derive:

$2.$ For $26$LB$20,$ L$=18,$ at maximum load that the design guide allows. See L beams in chapter $2.$ See earlier pages in the code for definition of the strand pattern and ys$.$ Do two load cases: DL$,$ then Total Load. $($You may not need SD$,$ but if you do: $30\%$ of the applied load is superimposed dead load, ~$70\%$ LL$.)$

Find the stresses $($midspan only$)$ using

a$)$ Basic Statics Concepts

b$)$ C$-$Line Method

c$)$ Load Balancing$)/(S^T$