Design of Slabs Study Notes

DESIGN OF SLAB

One way slab

(i) Ly/Lx ratio is less than 2

 where, l_y = length of longer span

l_x = length of shorter span

(ii) Slab is supported only on two edges.

Design of One way slab

Two way slab

(i)  Ly/Lx ratio is more than 2

(ii) Slab is supported on all edges.

Design of two way slab

1. Grasoff Ranking method
   It is used for corners not held down position.
   It is purely simply supported case.

(i) 

(ii) Moment in x-direction 

Moment in y-direction 

(iii) Shear force

At shorter edge (V_X)

At longer edge (V_y)

1. Design of slab with corner held down position

(a) Pigeauds method: 

where, the values of  are read from table

(b) I.S. code method

The values of  read from table (page 91, IS : 456-2000)

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