Strands are $(1)/(2)$ inch dia. stress$-$relieved seven$-$wire with a center eccentricity of $13\mathrm{.}12.$ Use an AASHTO prestressed simply supported I$-$beam with a span of $34$ ft which is $36$ in deep. Its cross$-$section is below. fc$=6000$ psi, fc$-$allow $=0\mathrm{.}45$ fc$$ for total loads, $0\mathrm{.}6$ fc$$ for temporary loads, fpu $=270$ ksi, fpi $=189$ ksi, fpe $=145$ psi, Ac $=369$ in$2,$ Ig $=50,979$ in$4,$ cb $=15\mathrm{.}83,$ Sb $=3,220$ in$3,$ St$=2,527$ in$3,$ Wd $=384$ lb$/$ft$,$ WL $=3600$ lb$/$ft Design the number strands by looking at the tension at the bottom less that ft $=12$ under full load. Check the other stresses.