A T$-$beam for a floor system has a slab thickness of $75$ mm and a web thickness of $375$ mm$.$ It has an effective depth of $600$ mm$.$ The beam carries a dead load moment of $280$ kN$-$m and a live load moment of $525$ kN$-$m$.$ It has a span of $5\mathrm{.}4$ m and a spacing center to center of $1\mathrm{.}8$ m$.$ Use reduction factor $=0\mathrm{.}90,$ fc$=20\mathrm{.}7$ MPa, fy $=344\mathrm{.}7$ MPa. Determine the required steel area See the formula in the instructions Formula:

Use b$\_$f $=16$ h$+$b$\_$w

$$b$\_$f $=$s$\_$w$+$b$\_$w

b$\_$f $=$L$/4$