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10 CHAPTER 10: STAIRCASES
while 2 cm thick plaster is applied to both the risers and bottom surfaces of the slab. Use f 250kg/cm2 c′= , f 4200kg/cm2 y = , γ 2.2t/m3 plaster = , and γ 2.6 t/m3 marble = . Solution: Minimum stair thickness required to satisfy deflection requirements is given by cm l h 7.5 20 150 min 20 = = = Let slab waist t be equal to 7.5 cm.
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