**Simply Supported Slab Design **

The following process of Design of Simply Supported Slab.

- First of all suitable bearings required to be assume. After that span of the slab determined between centre of bearings.
- The thickness of the slab must be finalize .(It may be 100 mm or 125mm etc.)
- Now effective span of the slab required to be design by calculating the lesser value of the following two items,

- Clear span + effective depth of the simply supported slab.(effective depth is calculated by considering clear cover)
- Centre to centre distance of bearings.

- Determination of Dead Load and Live Load of slab

i)Dead Load of the slab ,

=**(1 m X overall depth X 2400 kg/m ^{2}) /10**

ii) Live Load is considered as per design data consideration as per site situation.

5.Determination of Maximum Bending Moment (B.M) for one Metre of the Simply Supported slab.

**The maximum bending moment per metre width = Wl ^{2}/8 kg.m = Wl^{2}/8 X 100 kg.m**

I = effective span length of the ,

W = total load on square metre.

- Now determine balanced moment of resistance of Qbd
^{2}(Q x b X d^{2}) to find out maximum bending moment, to find out the effective depth. - At this stage the value of effective depth found from item no (6) and (2) is compared and realistic value is adopted.
- Calculation of requirement of steel of per metre width of the slab.

**A(t)= Maximum Bending moment/permissible stress in steel X lever arm**

- Selection of suitable diameter of reinforcement as a main reinforcement bar and spacing can be find out from the formula.

**= Area of one bar X 100 /Area of steel required per metre width**

- As Shear and bond stress value is very much low , in case of bridges slab, shear and bond stresses are also verified.