Estimate the depth of flat slabs from clauses 14.2.5 & 3.3.2.2.(b) Assume fy=300MPA. The absolute sum for the span shall be determined in a strip bounded laterally by the center line of the panel on each side of centre of the supports. The absolute sum of positive and average negative moments in each direction at the ultimate limit state shall be not less than: Mo=WuL2LnІ/8; Negative & positive design moments:
In an interior spans Negative moments 0.65 Positive moments---0.35 In end spans 22 Fy(MPA) Exteriors panels Interior panels 300 Ln/36 Ln/40 400 Ln/32 Ln/35 Exterior edge unrestrained Slab with beams between all supports Slabs without beams between interior supports Exterior edge fully restrained Without edge beams With edge beams Interior – ve moments 0.75 0.70 0.70 0.70 0.65 Positive moments 0.63 0.57 0.52 0.50 0.35 Exterior – ve moments 0 0.16 0.26 0.30 0.65