depends on as, only

depends on aCbC only

depends on both crst and acbc

is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bend¬ing compression.

0.35 d

0.40 d

0.45 d

dependent on grade of concrete also

20 kN/cm2

200 kN/cm2

200kN/mm2

2xl06N/cm2

M15

M20

M 10

M25

0.75-0.80

0.80-0.85

0.85 - 0.92

above 0.92