design solid slab Manually

Example :- design solid slab for 

slab 4.5*2 m 

Solution

L = 4.5 m & Ls = 2m 

R = 4.5 / 2 = 2.25 

One way slab 

Ts = 2.00 / 25 = 0.08 ( simple )

Use ts = 12 cm 

W dead = own wt + covering + wall 

W dead = 0.12 * 2.5 + 0.15 + 0.2

( assume w wall = 0.2 t/m2 ) 

W dead = 0.65 t/m2 

W live = 0.2 t/m2 

Wu = 1.4*0.65 + 1.6 * 0.2 = 1.23 t/m2 

Mu = 1.23 * 2 * 2 / 8 = 0.62 t.m. 

As = 0.62*100000/3600/0.8/10 = 2.2 cm2 

Use 5 bars diameter 10 mm/m (short direction)

And min. in long direction 5bars dim. 10mm /m

Final :- ts = 12 cm & 5bars dim. 10mm /m in two 

directions