(Solved): A floor system shown in Figure below consists of a \( 75 \mathrm{~mm} \) concrete slab supported by ...

A floor system shown in Figure below consists of a \( 75 \mathrm{~mm} \) concrete slab supported by concrete T-beams with a \( 7.5 \mathrm{~m} \) span and \( 1.2 \mathrm{~m} \) on centers. Web dimensions, which are determined by negative moments requirements at supports, are \( b_{u}=275 \) \( \mathrm{mm} \) and \( \mathrm{d}=500 \mathrm{~mm} \). What is the tensile steel area required at midspan to support a factored moment of \( 725 \mathrm{KN}-\mathrm{m} \) ? Material properties: \( \mathrm{fc}^{\prime}=21 \mathrm{MPa} \) and fy= \( 420 \mathrm{MPa} \).