A floor system is supported by beams with a span L = 6 m, section bw = 40 cm, cast monolithically with a 6.5 cm thick slab. The center-to-center spacing between beams is 5 m. In the positive moment zone, they are provided with 18 bars of 1" arranged in three layers of 6m with 75 cm. The resistances of the materials are f'c = 347 kg / cm² and fy = 4200 kg / cm². Find the resistant moment of the soul ( T - m , without decimals).