1. 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

2. 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

3. Torsion Reinforcement

4. Torsion Reinforcement

5. Typical One Way slab

6. Typical Two Way slab

7. PROBLEM
Prepare a detailed structural drawing of one way continuous slab for a hall of clear dimensions 7m wide and 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

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

9. PROBLEM