Introduction Used for covering spaces in the form of roof or floor Slab may be supported on walls or beams or columns . Slab supported directly by columns are called flat slab One Way Slab Two Way Slab

Introduction Slabs could be simply supported, continuous or cantilever In two way slab the corners may be held down by restraints or may be allowed to lift up Additional torsion reinforcement is required at corners when it is restrained against uplifting as shown in Fig

Torsion Reinforcement

Torsion Reinforcement

Typical One Way slab

Typical Two Way slab

PROBLEM Prepare a detailed structural drawing of one way continuous slab for a hall of clear dimensions 7m wide and 11.77 m long, use following data Centre to centre distance of supporting beams = 3.0 m Span of the beams = 7.23m Beams are supported on walls of 0.23 m thickness C/s of beam = 230 x 450 mm Grade of concrete : M20 Type of steel : Fe415 Clear cover : 20 mm Slab thickness: 150 mm Beam depth is inclusive of slab depth, The hall is having walls on all 4 sides

PROBLEM Main positive reinforcement @ end span = 8mm diameter @100 c/c Main reinforcement in other interior panels = 8 mm diameter @ 200 c/c Negative reinforcement @ all supports = 8mm diameter @ 200 c/c Distribution steel= 8mm diameter @ 200 c/c

PROBLEM