0

10

20

30

100 mm

150 mm

200 mm

250 mm

less than 1

between 1 and 1.5

between 1.5 and 2

greater than 2

less than 1

between 1 and 1.5

between 1.5 and 2.0

greater than 2

higher compressive strength of con-crete

lower compressive strength of concrete

higher tensile strength of steel

lower tensile strength of steel