$1.$ Determine the maximum span length, $L,$ for the following cross$-$section

Use ACI Load Combinations

include selfweight

$fc=5$ksi

$fy=80$ksi

$2.$ For the previous problem, you will provide a prestressed beam as a substitute. Determine the number of $0\mathrm{.}6-$inch diameter

strands that are equivalent to the $8-$No$.11$ s$.$

Assume the stress in a single strand at failure is $0\mathrm{.}95$ times its ultimate tensile strength $(fP=0\mathrm{.}95270$ksi$=256$ksi $)$